如何在不安装 Microsoft Office 的情况下使用 C# 创建 Excel (.XLS 和 .XLSX) 文件?

我找到了另一个不需要太多依赖的库：MiniExcel。
你可以创建一个DataSet，其中包含以电子表格为基础的DataTable（表名是电子表格的名称），然后将其保存为.xlsx文件。

using var stream = File.Create(filePath);
stream.SaveAs(dataSet);

或者

MiniExcel.SaveAs(filePath, dataSet);

它还提供了读取Excel文件的功能，并支持读写CSV文件。

你可以使用Excel XML格式直接将它写成XML，然后以.XLS扩展名命名，就可以用Excel打开。您可以在XML文件标题中控制所有格式（加粗、宽度等）。
这里有一个来自维基百科的示例XML。

一个经常被忽视的简单方法是使用Microsoft Reporting创建.rdlc报告，并将其导出为Excel格式。您可以在Visual Studio中进行设计，并使用以下方式生成文件：

localReport.Render("EXCELOPENXML", null, ((name, ext, encoding, mimeType, willSeek) => stream = new FileStream(name, FileMode.CreateNew)), out warnings);

你还可以使用"WORDOPENXML"和"PDF"将其导出为.doc或.pdf格式，它支持许多不同的平台，如ASP.NET和SSRS。在可视化设计师中进行更改要容易得多，您可以看到结果。相信我，一旦开始对数据进行分组、格式化组标题、添加新部分，您就不想再去处理数十个XML节点了。

我也支持使用GemBox.Spreadsheet。

它非常快速易用，网站上还有大量示例。

使我的报表任务在执行速度方面达到了一个全新水平。

你可以尝试使用我的SwiftExcel库。该库直接写入文件，非常高效。例如，你可以在几秒钟内写入10万行，而不使用任何内存。
以下是一个简单的用法示例：

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx"))
{
    for (var row = 1; row <= 10; row++)
    {
        for (var col = 1; col <= 5; col++)
        {
            ew.Write($"row:{row}-col:{col}", col, row);
        }
    }
}

以下是创建Excel文件的最简单方式。

带有 .xlsx 扩展名的Excel文件是压缩的文件夹，其中包含 .XML 文件 - 但是很复杂。

首先按照以下目录结构创建文件夹 -

public class CreateFileOrFolder
{
    static void Main()
    {
        //
        // https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/file-system/how-to-create-a-file-or-folder
        //
        // https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/file-system/how-to-write-to-a-text-file
        //
        // .NET Framework 4.7.2
        //
        // Specify a name for your top-level folder.
        string folderName = @"C:\Users\david\Desktop\Book3";

        // To create a string that specifies the path to a subfolder under your
        // top-level folder, add a name for the subfolder to folderName.

        string pathString = System.IO.Path.Combine(folderName, "_rels");
        System.IO.Directory.CreateDirectory(pathString);
        pathString = System.IO.Path.Combine(folderName, "docProps");
        System.IO.Directory.CreateDirectory(pathString);
        pathString = System.IO.Path.Combine(folderName, "xl");
        System.IO.Directory.CreateDirectory(pathString);

        string subPathString = System.IO.Path.Combine(pathString, "_rels");
        System.IO.Directory.CreateDirectory(subPathString);
        subPathString = System.IO.Path.Combine(pathString, "theme");
        System.IO.Directory.CreateDirectory(subPathString);
        subPathString = System.IO.Path.Combine(pathString, "worksheets");
        System.IO.Directory.CreateDirectory(subPathString);
        // Keep the console window open in debug mode.
        System.Console.WriteLine("Press any key to exit.");
        System.Console.ReadKey();
    }
}

接下来，创建文本文件以保存描述Excel电子表格所需的XML。

namespace MakeFiles3
{
    class Program
    {
        static void Main(string[] args)
        {
            //
            // https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/file-system/how-to-write-to-a-text-file
            //
            // .NET Framework 4.7.2
            //
            string fileName = @"C:\Users\david\Desktop\Book3\_rels\.rels";
            fnWriteFile(fileName);
            fileName = @"C:\Users\david\Desktop\Book3\docProps\app.xml";
            fnWriteFile(fileName);
            fileName = @"C:\Users\david\Desktop\Book3\docProps\core.xml";
            fnWriteFile(fileName);
            fileName = @"C:\Users\david\Desktop\Book3\xl\_rels\workbook.xml.rels";
            fnWriteFile(fileName);
            fileName = @"C:\Users\david\Desktop\Book3\xl\theme\theme1.xml";
            fnWriteFile(fileName);
            fileName = @"C:\Users\david\Desktop\Book3\xl\worksheets\sheet1.xml";
            fnWriteFile(fileName);
            fileName = @"C:\Users\david\Desktop\Book3\xl\styles.xml";
            fnWriteFile(fileName);
            fileName = @"C:\Users\david\Desktop\Book3\xl\workbook.xml";
            fnWriteFile(fileName);
            fileName = @"C:\Users\david\Desktop\Book3\[Content_Types].xml";
            fnWriteFile(fileName);
            // Keep the console window open in debug mode.
            System.Console.WriteLine("Press any key to exit.");
            System.Console.ReadKey();

            bool fnWriteFile(string strFilePath)
            {
                if (!System.IO.File.Exists(strFilePath))
                {
                    using (System.IO.FileStream fs = System.IO.File.Create(strFilePath))
                    {
                        return true;
                    }
                }
                else
                {
                    System.Console.WriteLine("File \"{0}\" already exists.", strFilePath);
                    return false;
                }
            }
        }
    }
}

接下来，使用XML填充文本文件。

所需的XML相当冗长，因此您可能需要使用此GitHub存储库。

https://github.com/DaveTallett26/MakeFiles4/blob/master/MakeFiles4/Program.cs

//
// https://learn.microsoft.com/en-us/dotnet/standard/io/how-to-write-text-to-a-file
// .NET Framework 4.7.2
//
using System.IO;

namespace MakeFiles4
{
    class Program
    {
        static void Main(string[] args)
        {
            string xContents = @"a";
            string xFilename = @"a";
            xFilename = @"C:\Users\david\Desktop\Book3\[Content_Types].xml";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><Types xmlns=""http://schemas.openxmlformats.org/package/2006/content-types""><Default Extension=""rels"" ContentType=""application/vnd.openxmlformats-package.relationships+xml""/><Default Extension=""xml"" ContentType=""application/xml""/><Override PartName=""/xl/workbook.xml"" ContentType=""application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml""/><Override PartName=""/xl/worksheets/sheet1.xml"" ContentType=""application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml""/><Override PartName=""/xl/theme/theme1.xml"" ContentType=""application/vnd.openxmlformats-officedocument.theme+xml""/><Override PartName=""/xl/styles.xml"" ContentType=""application/vnd.openxmlformats-officedocument.spreadsheetml.styles+xml""/><Override PartName=""/docProps/core.xml"" ContentType=""application/vnd.openxmlformats-package.core-properties+xml""/><Override PartName=""/docProps/app.xml"" ContentType=""application/vnd.openxmlformats-officedocument.extended-properties+xml""/></Types>";
            StartExstream(xContents, xFilename);

            xFilename = @"C:\Users\david\Desktop\Book3\_rels\.rels";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><Relationships xmlns=""http://schemas.openxmlformats.org/package/2006/relationships""><Relationship Id=""rId3"" Type=""http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties"" Target=""docProps/app.xml""/><Relationship Id=""rId2"" Type=""http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties"" Target=""docProps/core.xml""/><Relationship Id=""rId1"" Type=""http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument"" Target=""xl/workbook.xml""/></Relationships>";
            StartExstream(xContents, xFilename);

            xFilename = @"C:\Users\david\Desktop\Book3\docProps\app.xml";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><Properties xmlns=""http://schemas.openxmlformats.org/officeDocument/2006/extended-properties"" xmlns:vt=""http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes""><Application>Microsoft Excel</Application><DocSecurity>0</DocSecurity><ScaleCrop>false</ScaleCrop><HeadingPairs><vt:vector size=""2"" baseType=""variant""><vt:variant><vt:lpstr>Worksheets</vt:lpstr></vt:variant><vt:variant><vt:i4>1</vt:i4></vt:variant></vt:vector></HeadingPairs><TitlesOfParts><vt:vector size=""1"" baseType=""lpstr""><vt:lpstr>Sheet1</vt:lpstr></vt:vector></TitlesOfParts><Company></Company><LinksUpToDate>false</LinksUpToDate><SharedDoc>false</SharedDoc><HyperlinksChanged>false</HyperlinksChanged><AppVersion>16.0300</AppVersion></Properties>";
            StartExstream(xContents, xFilename);

            xFilename = @"C:\Users\david\Desktop\Book3\docProps\core.xml";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><cp:coreProperties xmlns:cp=""http://schemas.openxmlformats.org/package/2006/metadata/core-properties"" xmlns:dc=""http://purl.org/dc/elements/1.1/"" xmlns:dcterms=""http://purl.org/dc/terms/"" xmlns:dcmitype=""http://purl.org/dc/dcmitype/"" xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance""><dc:creator>David Tallett</dc:creator><cp:lastModifiedBy>David Tallett</cp:lastModifiedBy><dcterms:created xsi:type=""dcterms:W3CDTF"">2021-10-26T15:47:15Z</dcterms:created><dcterms:modified xsi:type=""dcterms:W3CDTF"">2021-10-26T15:47:35Z</dcterms:modified></cp:coreProperties>";
            StartExstream(xContents, xFilename);

            xFilename = @"C:\Users\david\Desktop\Book3\xl\styles.xml";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><styleSheet xmlns=""http://schemas.openxmlformats.org/spreadsheetml/2006/main"" xmlns:mc=""http://schemas.openxmlformats.org/markup-compatibility/2006"" mc:Ignorable=""x14ac x16r2 xr"" xmlns:x14ac=""http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"" xmlns:x16r2=""http://schemas.microsoft.com/office/spreadsheetml/2015/02/main"" xmlns:xr=""http://schemas.microsoft.com/office/spreadsheetml/2014/revision""><fonts count=""1"" x14ac:knownFonts=""1""><font><sz val=""11""/><color theme=""1""/><name val=""Calibri""/><family val=""2""/><scheme val=""minor""/></font></fonts><fills count=""2""><fill><patternFill patternType=""none""/></fill><fill><patternFill patternType=""gray125""/></fill></fills><borders count=""1""><border><left/><right/><top/><bottom/><diagonal/></border></borders><cellStyleXfs count=""1""><xf numFmtId=""0"" fontId=""0"" fillId=""0"" borderId=""0""/></cellStyleXfs><cellXfs count=""1""><xf numFmtId=""0"" fontId=""0"" fillId=""0"" borderId=""0"" xfId=""0""/></cellXfs><cellStyles count=""1""><cellStyle name=""Normal"" xfId=""0"" builtinId=""0""/></cellStyles><dxfs count=""0""/><tableStyles count=""0"" defaultTableStyle=""TableStyleMedium2"" defaultPivotStyle=""PivotStyleLight16""/><extLst><ext uri=""{EB79DEF2-80B8-43e5-95BD-54CBDDF9020C}"" xmlns:x14=""http://schemas.microsoft.com/office/spreadsheetml/2009/9/main""><x14:slicerStyles defaultSlicerStyle=""SlicerStyleLight1""/></ext><ext uri=""{9260A510-F301-46a8-8635-F512D64BE5F5}"" xmlns:x15=""http://schemas.microsoft.com/office/spreadsheetml/2010/11/main""><x15:timelineStyles defaultTimelineStyle=""TimeSlicerStyleLight1""/></ext></extLst></styleSheet>";
            StartExstream(xContents, xFilename);

            xFilename = @"C:\Users\david\Desktop\Book3\xl\workbook.xml";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><workbook xmlns=""http://schemas.openxmlformats.org/spreadsheetml/2006/main"" xmlns:r=""http://schemas.openxmlformats.org/officeDocument/2006/relationships"" xmlns:mc=""http://schemas.openxmlformats.org/markup-compatibility/2006"" mc:Ignorable=""x15 xr xr6 xr10 xr2"" xmlns:x15=""http://schemas.microsoft.com/office/spreadsheetml/2010/11/main"" xmlns:xr=""http://schemas.microsoft.com/office/spreadsheetml/2014/revision"" xmlns:xr6=""http://schemas.microsoft.com/office/spreadsheetml/2016/revision6"" xmlns:xr10=""http://schemas.microsoft.com/office/spreadsheetml/2016/revision10"" xmlns:xr2=""http://schemas.microsoft.com/office/spreadsheetml/2015/revision2""><fileVersion appName=""xl"" lastEdited=""7"" lowestEdited=""7"" rupBuild=""24430""/><workbookPr defaultThemeVersion=""166925""/><mc:AlternateContent xmlns:mc=""http://schemas.openxmlformats.org/markup-compatibility/2006""><mc:Choice Requires=""x15""><x15ac:absPath url=""C:\Users\david\Desktop\"" xmlns:x15ac=""http://schemas.microsoft.com/office/spreadsheetml/2010/11/ac""/></mc:Choice></mc:AlternateContent><xr:revisionPtr revIDLastSave=""0"" documentId=""8_{C633700D-2D40-49EE-8C5E-2561E28A6758}"" xr6:coauthVersionLast=""47"" xr6:coauthVersionMax=""47"" xr10:uidLastSave=""{00000000-0000-0000-0000-000000000000}""/><bookViews><workbookView xWindow=""-120"" yWindow=""-120"" windowWidth=""29040"" windowHeight=""15840"" xr2:uid=""{934C5B62-1DC1-4322-BAE8-00D615BD2FB3}""/></bookViews><sheets><sheet name=""Sheet1"" sheetId=""1"" r:id=""rId1""/></sheets><calcPr calcId=""191029""/><extLst><ext uri=""{140A7094-0E35-4892-8432-C4D2E57EDEB5}"" xmlns:x15=""http://schemas.microsoft.com/office/spreadsheetml/2010/11/main""><x15:workbookPr chartTrackingRefBase=""1""/></ext><ext uri=""{B58B0392-4F1F-4190-BB64-5DF3571DCE5F}"" xmlns:xcalcf=""http://schemas.microsoft.com/office/spreadsheetml/2018/calcfeatures""><xcalcf:calcFeatures><xcalcf:feature name=""microsoft.com:RD""/><xcalcf:feature name=""microsoft.com:Single""/><xcalcf:feature name=""microsoft.com:FV""/><xcalcf:feature name=""microsoft.com:CNMTM""/><xcalcf:feature name=""microsoft.com:LET_WF""/></xcalcf:calcFeatures></ext></extLst></workbook>";
            StartExstream(xContents, xFilename);

            xFilename = @"C:\Users\david\Desktop\Book3\xl\_rels\workbook.xml.rels";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><Relationships xmlns=""http://schemas.openxmlformats.org/package/2006/relationships""><Relationship Id=""rId3"" Type=""http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"" Target=""styles.xml""/><Relationship Id=""rId2"" Type=""http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme"" Target=""theme/theme1.xml""/><Relationship Id=""rId1"" Type=""http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"" Target=""worksheets/sheet1.xml""/></Relationships>";
            StartExstream(xContents, xFilename);

            xFilename = @"C:\Users\david\Desktop\Book3\xl\theme\theme1.xml";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><a:theme xmlns:a=""http://schemas.openxmlformats.org/drawingml/2006/main"" name=""Office Theme""><a:themeElements><a:clrScheme name=""Office""><a:dk1><a:sysClr val=""windowText"" lastClr=""000000""/></a:dk1><a:lt1><a:sysClr val=""window"" lastClr=""FFFFFF""/></a:lt1><a:dk2><a:srgbClr val=""44546A""/></a:dk2><a:lt2><a:srgbClr val=""E7E6E6""/></a:lt2><a:accent1><a:srgbClr val=""4472C4""/></a:accent1><a:accent2><a:srgbClr val=""ED7D31""/></a:accent2><a:accent3><a:srgbClr val=""A5A5A5""/></a:accent3><a:accent4><a:srgbClr val=""FFC000""/></a:accent4><a:accent5><a:srgbClr val=""5B9BD5""/></a:accent5><a:accent6><a:srgbClr val=""70AD47""/></a:accent6><a:hlink><a:srgbClr val=""0563C1""/></a:hlink><a:folHlink><a:srgbClr val=""954F72""/></a:folHlink></a:clrScheme><a:fontScheme name=""Office""><a:majorFont><a:latin typeface=""Calibri Light"" panose=""020F0302020204030204""/><a:ea typeface=""""/><a:cs typeface=""""/><a:font script=""Jpan"" typeface=""游ゴシック Light""/><a:font script=""Hang"" typeface=""맑은 고딕""/><a:font script=""Hans"" typeface=""等线 Light""/><a:font script=""Hant"" typeface=""新細明體""/><a:font script=""Arab"" typeface=""Times New Roman""/><a:font script=""Hebr"" typeface=""Times New Roman""/><a:font script=""Thai"" typeface=""Tahoma""/><a:font script=""Ethi"" typeface=""Nyala""/><a:font script=""Beng"" typeface=""Vrinda""/><a:font script=""Gujr"" typeface=""Shruti""/><a:font script=""Khmr"" typeface=""MoolBoran""/><a:font script=""Knda"" typeface=""Tunga""/><a:font script=""Guru"" typeface=""Raavi""/><a:font script=""Cans"" typeface=""Euphemia""/><a:font script=""Cher"" typeface=""Plantagenet Cherokee""/><a:font script=""Yiii"" typeface=""Microsoft Yi Baiti""/><a:font script=""Tibt"" typeface=""Microsoft Himalaya""/><a:font script=""Thaa"" typeface=""MV Boli""/><a:font script=""Deva"" typeface=""Mangal""/><a:font script=""Telu"" typeface=""Gautami""/><a:font script=""Taml"" typeface=""Latha""/><a:font script=""Syrc"" typeface=""Estrangelo Edessa""/><a:font script=""Orya"" typeface=""Kalinga""/><a:font script=""Mlym"" typeface=""Kartika""/><a:font script=""Laoo"" typeface=""DokChampa""/><a:font script=""Sinh"" typeface=""Iskoola Pota""/><a:font script=""Mong"" typeface=""Mongolian Baiti""/><a:font script=""Viet"" typeface=""Times New Roman""/><a:font script=""Uigh"" typeface=""Microsoft Uighur""/><a:font script=""Geor"" typeface=""Sylfaen""/><a:font script=""Armn"" typeface=""Arial""/><a:font script=""Bugi"" typeface=""Leelawadee UI""/><a:font script=""Bopo"" typeface=""Microsoft JhengHei""/><a:font script=""Java"" typeface=""Javanese Text""/><a:font script=""Lisu"" typeface=""Segoe UI""/><a:font script=""Mymr"" typeface=""Myanmar Text""/><a:font script=""Nkoo"" typeface=""Ebrima""/><a:font script=""Olck"" typeface=""Nirmala UI""/><a:font script=""Osma"" typeface=""Ebrima""/><a:font script=""Phag"" typeface=""Phagspa""/><a:font script=""Syrn"" typeface=""Estrangelo Edessa""/><a:font script=""Syrj"" typeface=""Estrangelo Edessa""/><a:font script=""Syre"" typeface=""Estrangelo Edessa""/><a:font script=""Sora"" typeface=""Nirmala UI""/><a:font script=""Tale"" typeface=""Microsoft Tai Le""/><a:font script=""Talu"" typeface=""Microsoft New Tai Lue""/><a:font script=""Tfng"" typeface=""Ebrima""/></a:majorFont><a:minorFont><a:latin typeface=""Calibri"" panose=""020F0502020204030204""/><a:ea typeface=""""/><a:cs typeface=""""/><a:font script=""Jpan"" typeface=""游ゴシック""/><a:font script=""Hang"" typeface=""맑은 고딕""/><a:font script=""Hans"" typeface=""等线""/><a:font script=""Hant"" typeface=""新細明體""/><a:font script=""Arab"" typeface=""Arial""/><a:font script=""Hebr"" typeface=""Arial""/><a:font script=""Thai"" typeface=""Tahoma""/><a:font script=""Ethi"" typeface=""Nyala""/><a:font script=""Beng"" typeface=""Vrinda""/><a:font script=""Gujr"" typeface=""Shruti""/><a:font script=""Khmr"" typeface=""DaunPenh""/><a:font script=""Knda"" typeface=""Tunga""/><a:font script=""Guru"" typeface=""Raavi""/><a:font script=""Cans"" typeface=""Euphemia""/><a:font script=""Cher"" typeface=""Plantagenet Cherokee""/><a:font script=""Yiii"" typeface=""Microsoft Yi Baiti""/><a:font script=""Tibt"" typeface=""Microsoft Himalaya""/><a:font script=""Thaa"" typeface=""MV Boli""/><a:font script=""Deva"" typeface=""Mangal""/><a:font script=""Telu"" typeface=""Gautami""/><a:font script=""Taml"" typeface=""Latha""/><a:font script=""Syrc"" typeface=""Estrangelo Edessa""/><a:font script=""Orya"" typeface=""Kalinga""/><a:font script=""Mlym"" typeface=""Kartika""/><a:font script=""Laoo"" typeface=""DokChampa""/><a:font script=""Sinh"" typeface=""Iskoola Pota""/><a:font script=""Mong"" typeface=""Mongolian Baiti""/><a:font script=""Viet"" typeface=""Arial""/><a:font script=""Uigh"" typeface=""Microsoft Uighur""/><a:font script=""Geor"" typeface=""Sylfaen""/><a:font script=""Armn"" typeface=""Arial""/><a:font script=""Bugi"" typeface=""Leelawadee UI""/><a:font script=""Bopo"" typeface=""Microsoft JhengHei""/><a:font script=""Java"" typeface=""Javanese Text""/><a:font script=""Lisu"" typeface=""Segoe UI""/><a:font script=""Mymr"" typeface=""Myanmar Text""/><a:font script=""Nkoo"" typeface=""Ebrima""/><a:font script=""Olck"" typeface=""Nirmala UI""/><a:font script=""Osma"" typeface=""Ebrima""/><a:font script=""Phag"" typeface=""Phagspa""/><a:font script=""Syrn"" typeface=""Estrangelo Edessa""/><a:font script=""Syrj"" typeface=""Estrangelo Edessa""/><a:font script=""Syre"" typeface=""Estrangelo Edessa""/><a:font script=""Sora"" typeface=""Nirmala UI""/><a:font script=""Tale"" typeface=""Microsoft Tai Le""/><a:font script=""Talu"" typeface=""Microsoft New Tai Lue""/><a:font script=""Tfng"" typeface=""Ebrima""/></a:minorFont></a:fontScheme><a:fmtScheme name=""Office""><a:fillStyleLst><a:solidFill><a:schemeClr val=""phClr""/></a:solidFill><a:gradFill rotWithShape=""1""><a:gsLst><a:gs pos=""0""><a:schemeClr val=""phClr""><a:lumMod val=""110000""/><a:satMod val=""105000""/><a:tint val=""67000""/></a:schemeClr></a:gs><a:gs pos=""50000""><a:schemeClr val=""phClr""><a:lumMod val=""105000""/><a:satMod val=""103000""/><a:tint val=""73000""/></a:schemeClr></a:gs><a:gs pos=""100000""><a:schemeClr val=""phClr""><a:lumMod val=""105000""/><a:satMod val=""109000""/><a:tint val=""81000""/></a:schemeClr></a:gs></a:gsLst><a:lin ang=""5400000"" scaled=""0""/></a:gradFill><a:gradFill rotWithShape=""1""><a:gsLst><a:gs pos=""0""><a:schemeClr val=""phClr""><a:satMod val=""103000""/><a:lumMod val=""102000""/><a:tint val=""94000""/></a:schemeClr></a:gs><a:gs pos=""50000""><a:schemeClr val=""phClr""><a:satMod val=""110000""/><a:lumMod val=""100000""/><a:shade val=""100000""/></a:schemeClr></a:gs><a:gs pos=""100000""><a:schemeClr val=""phClr""><a:lumMod val=""99000""/><a:satMod val=""120000""/><a:shade val=""78000""/></a:schemeClr></a:gs></a:gsLst><a:lin ang=""5400000"" scaled=""0""/></a:gradFill></a:fillStyleLst><a:lnStyleLst><a:ln w=""6350"" cap=""flat"" cmpd=""sng"" algn=""ctr""><a:solidFill><a:schemeClr val=""phClr""/></a:solidFill><a:prstDash val=""solid""/><a:miter lim=""800000""/></a:ln><a:ln w=""12700"" cap=""flat"" cmpd=""sng"" algn=""ctr""><a:solidFill><a:schemeClr val=""phClr""/></a:solidFill><a:prstDash val=""solid""/><a:miter lim=""800000""/></a:ln><a:ln w=""19050"" cap=""flat"" cmpd=""sng"" algn=""ctr""><a:solidFill><a:schemeClr val=""phClr""/></a:solidFill><a:prstDash val=""solid""/><a:miter lim=""800000""/></a:ln></a:lnStyleLst><a:effectStyleLst><a:effectStyle><a:effectLst/></a:effectStyle><a:effectStyle><a:effectLst/></a:effectStyle><a:effectStyle><a:effectLst><a:outerShdw blurRad=""57150"" dist=""19050"" dir=""5400000"" algn=""ctr"" rotWithShape=""0""><a:srgbClr val=""000000""><a:alpha val=""63000""/></a:srgbClr></a:outerShdw></a:effectLst></a:effectStyle></a:effectStyleLst><a:bgFillStyleLst><a:solidFill><a:schemeClr val=""phClr""/></a:solidFill><a:solidFill><a:schemeClr val=""phClr""><a:tint val=""95000""/><a:satMod val=""170000""/></a:schemeClr></a:solidFill><a:gradFill rotWithShape=""1""><a:gsLst><a:gs pos=""0""><a:schemeClr val=""phClr""><a:tint val=""93000""/><a:satMod val=""150000""/><a:shade val=""98000""/><a:lumMod val=""102000""/></a:schemeClr></a:gs><a:gs pos=""50000""><a:schemeClr val=""phClr""><a:tint val=""98000""/><a:satMod val=""130000""/><a:shade val=""90000""/><a:lumMod val=""103000""/></a:schemeClr></a:gs><a:gs pos=""100000""><a:schemeClr val=""phClr""><a:shade val=""63000""/><a:satMod val=""120000""/></a:schemeClr></a:gs></a:gsLst><a:lin ang=""5400000"" scaled=""0""/></a:gradFill></a:bgFillStyleLst></a:fmtScheme></a:themeElements><a:objectDefaults/><a:extraClrSchemeLst/><a:extLst><a:ext uri=""{05A4C25C-085E-4340-85A3-A5531E510DB2}""><thm15:themeFamily xmlns:thm15=""http://schemas.microsoft.com/office/thememl/2012/main"" name=""Office Theme"" id=""{62F939B6-93AF-4DB8-9C6B-D6C7DFDC589F}"" vid=""{4A3C46E8-61CC-4603-A589-7422A47A8E4A}""/></a:ext></a:extLst></a:theme>";
            StartExstream(xContents, xFilename);

            xFilename = @"C:\Users\david\Desktop\Book3\xl\worksheets\sheet1.xml";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><worksheet xmlns=""http://schemas.openxmlformats.org/spreadsheetml/2006/main"" xmlns:r=""http://schemas.openxmlformats.org/officeDocument/2006/relationships"" xmlns:mc=""http://schemas.openxmlformats.org/markup-compatibility/2006"" mc:Ignorable=""x14ac xr xr2 xr3"" xmlns:x14ac=""http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"" xmlns:xr=""http://schemas.microsoft.com/office/spreadsheetml/2014/revision"" xmlns:xr2=""http://schemas.microsoft.com/office/spreadsheetml/2015/revision2"" xmlns:xr3=""http://schemas.microsoft.com/office/spreadsheetml/2016/revision3"" xr:uid=""{54E3D330-4E78-4755-89E0-1AADACAC4953}""><dimension ref=""A1:A3""/><sheetViews><sheetView tabSelected=""1"" workbookViewId=""0""><selection activeCell=""A4"" sqref=""A4""/></sheetView></sheetViews><sheetFormatPr defaultRowHeight=""15"" x14ac:dyDescent=""0.25""/><sheetData><row r=""1"" spans=""1:1"" x14ac:dyDescent=""0.25""><c r=""A1""><v>1</v></c></row><row r=""2"" spans=""1:1"" x14ac:dyDescent=""0.25""><c r=""A2""><v>2</v></c></row><row r=""3"" spans=""1:1"" x14ac:dyDescent=""0.25""><c r=""A3""><v>3</v></c></row></sheetData><pageMargins left=""0.7"" right=""0.7"" top=""0.75"" bottom=""0.75"" header=""0.3"" footer=""0.3""/></worksheet>";
            StartExstream(xContents, xFilename);

            // Keep the console window open in debug mode.
            System.Console.WriteLine("Press any key to exit.");
            System.Console.ReadKey();

            bool StartExstream(string strLine, string strFileName)
            {
                // Write the string to a file.
                using (StreamWriter outputFile = new StreamWriter(strFileName))
                {
                    outputFile.WriteLine(strLine);
                    return true;
                }
            }
        }
    }
}

最后将包含XML的文件夹结构压缩为ZIP文件 -

namespace ZipFolder
// .NET Framework 4.7.2
// https://dev59.com/JmUp5IYBdhLWcg3wf3oG?answertab=votes#tab-top
{
    class Program
    {
        static void Main(string[] args)
        {
            string xlPath = @"C:\Users\david\Desktop\Book3.xlsx";
            string folderPath = @"C:\Users\david\Desktop\Book3";

            System.IO.Compression.ZipFile.CreateFromDirectory(folderPath, xlPath);

            // Keep the console window open in debug mode.
            System.Console.WriteLine("Press any key to exit.");
            System.Console.ReadKey();
        }
    }
}

这将生成一个名为Book3.xlsx的Excel文件，该文件有效且可以在Windows 11上的Excel 365中干净地打开。

结果是一个非常简单的Excel电子表格，但您可能需要逆向工程一个更复杂的版本。以下是解压.xlsx文件的代码。

namespace UnZipXL
// .NET Framework 4.7.2
// https://dev59.com/JmUp5IYBdhLWcg3wf3oG?answertab=votes#tab-top
{
    class Program
    {
        static void Main(string[] args)
        {
            string XLPath = @"C:\Users\david\Desktop\Book2.xlsx";
            string extractPath = @"C:\Users\david\Desktop\extract";

            System.IO.Compression.ZipFile.ExtractToDirectory(XLPath, extractPath);

            // Keep the console window open in debug mode.
            System.Console.WriteLine("Press any key to exit.");
            System.Console.ReadKey();
        }
    }
}

更新：

以下是更新 Excel 文件的代码片段。这也非常简单。

//
// https://learn.microsoft.com/en-us/dotnet/standard/io/how-to-write-text-to-a-file
// .NET Framework 4.7.2
//
using System.IO;

namespace UpdateWorksheet5
{
    class Program
    {
        static void Main(string[] args)
        {
            string xContents = @"a";
            string xFilename = @"a";

            xFilename = @"C:\Users\david\Desktop\Book3\xl\worksheets\sheet1.xml";
            xContents = @"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?><worksheet xmlns=""http://schemas.openxmlformats.org/spreadsheetml/2006/main"" xmlns:r=""http://schemas.openxmlformats.org/officeDocument/2006/relationships"" xmlns:mc=""http://schemas.openxmlformats.org/markup-compatibility/2006"" mc:Ignorable=""x14ac xr xr2 xr3"" xmlns:x14ac=""http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"" xmlns:xr=""http://schemas.microsoft.com/office/spreadsheetml/2014/revision"" xmlns:xr2=""http://schemas.microsoft.com/office/spreadsheetml/2015/revision2"" xmlns:xr3=""http://schemas.microsoft.com/office/spreadsheetml/2016/revision3"" xr:uid=""{54E3D330-4E78-4755-89E0-1AADACAC4953}""><dimension ref=""A1:A3""/><sheetViews><sheetView tabSelected=""1"" workbookViewId=""0""><selection activeCell=""A4"" sqref=""A4""/></sheetView></sheetViews><sheetFormatPr defaultRowHeight=""15"" x14ac:dyDescent=""0.25""/><sheetData><row r=""1"" spans=""1:1"" x14ac:dyDescent=""0.25""><c r=""A1""><v>1</v></c></row><row r=""2"" spans=""1:1"" x14ac:dyDescent=""0.25""><c r=""A2""><v>2</v></c></row><row r=""3"" spans=""1:1"" x14ac:dyDescent=""0.25""><c r=""A3""><v>3</v></c></row></sheetData><pageMargins left=""0.7"" right=""0.7"" top=""0.75"" bottom=""0.75"" header=""0.3"" footer=""0.3""/></worksheet>";
            xContents = xContents.Remove(941, 1).Insert(941, "0"); //  character to replace is at 942 => index 941
            StartExstream(xContents, xFilename);

            // Keep the console window open in debug mode.
            System.Console.WriteLine("Press any key to exit.");
            System.Console.ReadKey();

            bool StartExstream(string strLine, string strFileName)
            {
                // Write the string to a file.
                using (StreamWriter outputFile = new StreamWriter(strFileName))
                {
                    outputFile.WriteLine(strLine);
                    return true;
                }
            }
        }
    }
}

更新 2 - 这段代码几乎没有更改，除了在 Mac 上的文件夹路径。使用 Microsoft Excel Online、.NET Framework 3.1、Visual Studio 2019 for Mac、MacOS Monterey 12.1。

如何在OneDrive上使用C#创建Excel(.xlsx)文件而不安装Microsoft Office Microsoft Graph API提供了用于创建和修改存储在企业和消费者帐户的OneDrive中的Excel文件的File和Excel API。Microsoft.Graph NuGet软件包提供了许多与File和Excel API一起工作的接口。

{
  Name = "myExcelFile.xslx",
  File = new Microsoft.Graph.File()
};

// Create an empty file in the user's OneDrive.
var excelWorkbookDriveItem = await graphClient.Me.Drive.Root.Children.Request().AddAsync(excelWorkbook);

// Add the contents of a template Excel file.
DriveItem excelDriveItem;
using (Stream ms = ResourceHelper.GetResourceAsStream(ResourceHelper.ExcelTestResource))
{
    //Upload content to the file. ExcelTestResource is an empty template Excel file.
    //https://graph.microsoft.io/en-us/docs/api-reference/v1.0/api/item_uploadcontent
    excelDriveItem = await graphClient.Me.Drive.Items[excelWorkbookDriveItem.Id].Content.Request().PutAsync<DriveItem>(ms);
}

现在，您已经在用户（企业或消费者）或组的OneDrive中创建了一个Excel文件。您现在可以使用Excel APIs来对Excel文件进行更改，而无需使用Excel并且不需要理解Excel XML格式。

http://www.codeproject.com/KB/cs/Excel_and_C_.aspx <= 为什么不直接使用 Windows 的内置功能，在服务器上安装 Office，任何应用程序都可以自动化。

使用本机方法会更加容易。

如果已经安装了它，您就可以使用它。这是 Windows 中最棒且未被充分利用的功能，过去曾被称为 COM，它可以节省大量时间和麻烦。

或者更简单的方法是使用 MS 提供的 ref lib - http://csharp.net-informations.com/excel/csharp-create-excel.htm

您可以在 Visual Studio 上安装 OpenXml nuget 包。以下是将数据表导出到 Excel 文件的代码示例：

Imports DocumentFormat.OpenXml
Imports DocumentFormat.OpenXml.Packaging
Imports DocumentFormat.OpenXml.Spreadsheet

Public Class ExportExcelClass
    Public Sub New()

    End Sub

    Public Sub ExportDataTable(ByVal table As DataTable, ByVal exportFile As String)
        ' Create a spreadsheet document by supplying the filepath.
        ' By default, AutoSave = true, Editable = true, and Type = xlsx.
        Dim spreadsheetDocument As SpreadsheetDocument = spreadsheetDocument.Create(exportFile, SpreadsheetDocumentType.Workbook)

        ' Add a WorkbookPart to the document.
        Dim workbook As WorkbookPart = spreadsheetDocument.AddWorkbookPart
        workbook.Workbook = New Workbook

        ' Add a WorksheetPart to the WorkbookPart.
        Dim Worksheet As WorksheetPart = workbook.AddNewPart(Of WorksheetPart)()
        Worksheet.Worksheet = New Worksheet(New SheetData())

        ' Add Sheets to the Workbook.
        Dim sheets As Sheets = spreadsheetDocument.WorkbookPart.Workbook.AppendChild(Of Sheets)(New Sheets())

        Dim data As SheetData = Worksheet.Worksheet.GetFirstChild(Of SheetData)()
        Dim Header As Row = New Row()
        Header.RowIndex = CType(1, UInt32)

        For Each column As DataColumn In table.Columns
            Dim headerCell As Cell = createTextCell(table.Columns.IndexOf(column) + 1, 1, column.ColumnName)
            Header.AppendChild(headerCell)
        Next

        data.AppendChild(Header)

        Dim contentRow As DataRow
        For i As Integer = 0 To table.Rows.Count - 1
            contentRow = table.Rows(i)
            data.AppendChild(createContentRow(contentRow, i + 2))
        Next

    End Sub

    Private Function createTextCell(ByVal columnIndex As Integer, ByVal rowIndex As Integer, ByVal cellValue As Object) As Cell
        Dim cell As Cell = New Cell()
        cell.DataType = CellValues.InlineString

        cell.CellReference = getColumnName(columnIndex) + rowIndex.ToString

        Dim inlineString As InlineString = New InlineString()
        Dim t As Text = New Text()
        t.Text = cellValue.ToString()
        inlineString.AppendChild(t)
        cell.AppendChild(inlineString)
        Return cell
    End Function

    Private Function createContentRow(ByVal dataRow As DataRow, ByVal rowIndex As Integer) As Row
        Dim row As Row = New Row With {
            .rowIndex = CType(rowIndex, UInt32)
        }

        For i As Integer = 0 To dataRow.Table.Columns.Count - 1
            Dim dataCell As Cell = createTextCell(i + 1, rowIndex, dataRow(i))
            row.AppendChild(dataCell)
        Next

        Return row
    End Function

    Private Function getColumnName(ByVal columnIndex As Integer) As String
        Dim dividend As Integer = columnIndex
        Dim columnName As String = String.Empty
        Dim modifier As Integer

        While dividend > 0
            modifier = (dividend - 1) Mod 26
            columnName = Convert.ToChar(65 + modifier).ToString() & columnName
            dividend = CInt(((dividend - modifier) / 26))
        End While

        Return columnName
    End Function
End Class

我重新编写了代码，现在你可以创建一个 .xls 文件，稍后可以转换为 Excel 2003 开放式 XML 格式。

private static void exportToExcel(DataSet source, string fileName)
    {
        // Documentacion en:
        // https://en.wikipedia.org/wiki/Microsoft_Office_XML_formats
        // https://answers.microsoft.com/en-us/msoffice/forum/all/how-to-save-office-ms-xml-as-xlsx-file/4a77dae5-6855-457d-8359-e7b537beb1db
        // https://riptutorial.com/es/openxml

        const string startExcelXML = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n"+
                 "<?mso-application progid=\"Excel.Sheet\"?>\r\n" +
                 "<Workbook xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\"\r\n" +
                 "xmlns:o=\"urn:schemas-microsoft-com:office:office\"\r\n " +
                 "xmlns:x=\"urn:schemas-microsoft-com:office:excel\"\r\n " +
                 "xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\"\r\n " +
                 "xmlns:html=\"http://www.w3.org/TR/REC-html40\">\r\n " +
                 "xmlns:html=\"https://www.w3.org/TR/html401/\">\r\n " +

                 "<DocumentProperties xmlns=\"urn:schemas-microsoft-com:office:office\">\r\n " +
                 "  <Version>16.00</Version>\r\n " +
                 "</DocumentProperties>\r\n " +
                 " <OfficeDocumentSettings xmlns=\"urn:schemas-microsoft-com:office:office\">\r\n " +
                 "  <AllowPNG/>\r\n " +
                 " </OfficeDocumentSettings>\r\n " +

                 " <ExcelWorkbook xmlns=\"urn:schemas-microsoft-com:office:excel\">\r\n " +
                 "  <WindowHeight>9750</WindowHeight>\r\n " +
                 "  <WindowWidth>24000</WindowWidth>\r\n " +
                 "  <WindowTopX>0</WindowTopX>\r\n " +
                 "  <WindowTopY>0</WindowTopY>\r\n " +
                 "  <RefModeR1C1/>\r\n " +
                 "  <ProtectStructure>False</ProtectStructure>\r\n " +
                 "  <ProtectWindows>False</ProtectWindows>\r\n " +
                 " </ExcelWorkbook>\r\n " +

                 "<Styles>\r\n " +
                 "<Style ss:ID=\"Default\" ss:Name=\"Normal\">\r\n " +
                 "<Alignment ss:Vertical=\"Bottom\"/>\r\n <Borders/>" +
                 "\r\n <Font/>\r\n <Interior/>\r\n <NumberFormat/>" +
                 "\r\n <Protection/>\r\n </Style>\r\n " +
                 "<Style ss:ID=\"BoldColumn\">\r\n <Font " +
                 "x:Family=\"Swiss\" ss:Bold=\"1\"/>\r\n </Style>\r\n " +
                 "<Style ss:ID=\"StringLiteral\">\r\n <NumberFormat" +
                 " ss:Format=\"@\"/>\r\n </Style>\r\n <Style " +
                 "ss:ID=\"Decimal\">\r\n <NumberFormat " +
                 "ss:Format=\"0.0000\"/>\r\n </Style>\r\n " +
                 "<Style ss:ID=\"Integer\">\r\n <NumberFormat/>" +
                 "ss:Format=\"0\"/>\r\n </Style>\r\n <Style " +
                 "ss:ID=\"DateLiteral\">\r\n <NumberFormat " +
                 "ss:Format=\"dd/mm/yyyy;@\"/>\r\n </Style>\r\n " +
                 "</Styles>\r\n ";
        System.IO.StreamWriter excelDoc = null;
        excelDoc = new System.IO.StreamWriter(fileName,false);

        int sheetCount = 1;
        excelDoc.Write(startExcelXML);
        foreach (DataTable table in source.Tables)
        {
            int rowCount = 0;
            excelDoc.Write("<Worksheet ss:Name=\"" + table.TableName + "\">");
            excelDoc.Write("<Table>");
            excelDoc.Write("<Row>");
            for (int x = 0; x < table.Columns.Count; x++)
            {
                excelDoc.Write("<Cell ss:StyleID=\"BoldColumn\"><Data ss:Type=\"String\">");
                excelDoc.Write(table.Columns[x].ColumnName);
                excelDoc.Write("</Data></Cell>");
            }
            excelDoc.Write("</Row>");
            foreach (DataRow x in table.Rows)
            {
                rowCount++;
                //if the number of rows is > 64000 create a new page to continue output
                if (rowCount == 1048576)
                {
                    rowCount = 0;
                    sheetCount++;
                    excelDoc.Write("</Table>");
                    excelDoc.Write(" </Worksheet>");
                    excelDoc.Write("<Worksheet ss:Name=\"" + table.TableName + "\">");
                    excelDoc.Write("<Table>");
                }
                excelDoc.Write("<Row>"); //ID=" + rowCount + "
                for (int y = 0; y < table.Columns.Count; y++)
                {
                    System.Type rowType;
                    rowType = x[y].GetType();
                    switch (rowType.ToString())
                    {
                        case "System.String":
                            string XMLstring = x[y].ToString();
                            XMLstring = XMLstring.Trim();
                            XMLstring = XMLstring.Replace("&", "&");
                            XMLstring = XMLstring.Replace(">", ">");
                            XMLstring = XMLstring.Replace("<", "<");
                            excelDoc.Write("<Cell ss:StyleID=\"StringLiteral\">" +
                                           "<Data ss:Type=\"String\">");
                            excelDoc.Write(XMLstring);
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.DateTime":
                            //Excel has a specific Date Format of YYYY-MM-DD followed by  
                            //the letter 'T' then hh:mm:sss.lll Example 2005-01-31T24:01:21.000
                            //The Following Code puts the date stored in XMLDate 
                            //to the format above
                            DateTime XMLDate = (DateTime)x[y];
                            string XMLDatetoString = ""; //Excel Converted Date
                            XMLDatetoString = XMLDate.Year.ToString() +
                                 "-" +
                                 (XMLDate.Month < 10 ? "0" +
                                 XMLDate.Month.ToString() : XMLDate.Month.ToString()) +
                                 "-" +
                                 (XMLDate.Day < 10 ? "0" +
                                 XMLDate.Day.ToString() : XMLDate.Day.ToString()) +
                                 "T" +
                                 (XMLDate.Hour < 10 ? "0" +
                                 XMLDate.Hour.ToString() : XMLDate.Hour.ToString()) +
                                 ":" +
                                 (XMLDate.Minute < 10 ? "0" +
                                 XMLDate.Minute.ToString() : XMLDate.Minute.ToString()) +
                                 ":" +
                                 (XMLDate.Second < 10 ? "0" +
                                 XMLDate.Second.ToString() : XMLDate.Second.ToString()) +
                                 ".000";
                            excelDoc.Write("<Cell ss:StyleID=\"DateLiteral\">" +
                                         "<Data ss:Type=\"DateTime\">");
                            excelDoc.Write(XMLDatetoString);
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.Boolean":
                            excelDoc.Write("<Cell ss:StyleID=\"StringLiteral\">" +
                                        "<Data ss:Type=\"String\">");
                            excelDoc.Write(x[y].ToString());
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.Int16":
                        case "System.Int32":
                        case "System.Int64":
                        case "System.Byte":
                            excelDoc.Write("<Cell ss:StyleID=\"Integer\">" +
                                    "<Data ss:Type=\"Number\">");
                            excelDoc.Write(x[y].ToString());
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.Decimal":
                        case "System.Double":
                            excelDoc.Write("<Cell ss:StyleID=\"Decimal\">" +
                                  "<Data ss:Type=\"Number\">");
                            excelDoc.Write(x[y].ToString());
                            excelDoc.Write("</Data></Cell>");
                            break;
                        case "System.DBNull":
                            excelDoc.Write("<Cell ss:StyleID=\"StringLiteral\">" +
                                  "<Data ss:Type=\"String\">");
                            excelDoc.Write("");
                            excelDoc.Write("</Data></Cell>");
                            break;
                        default:
                            throw (new Exception(rowType.ToString() + " not handled."));
                    }
                }
                excelDoc.Write("</Row>");
            }
            excelDoc.Write("</Table>");
            excelDoc.Write("</Worksheet>");               
            sheetCount++;
        }

        const string endExcelOptions1 = "\r\n<WorksheetOptions xmlns=\"urn:schemas-microsoft-com:office:excel\">\r\n" +
            "<Selected/>\r\n" +
            "<ProtectObjects>False</ProtectObjects>\r\n" +
            "<ProtectScenarios>False</ProtectScenarios>\r\n" +
            "</WorksheetOptions>\r\n";

        excelDoc.Write(endExcelOptions1);
        excelDoc.Write("</Workbook>");
        excelDoc.Close();
    }