我有一个包含30多个列和6500多行的DataTable。我需要将整个DataTable值转储到Excel文件中。请问有谁可以帮忙提供C#代码?我需要每个列值都在一个单元格中。准确地说,我需要在Excel文件中得到与DataTable完全相同的外观副本。请求帮助。
谢谢, Vix
我有一个包含30多个列和6500多行的DataTable。我需要将整个DataTable值转储到Excel文件中。请问有谁可以帮忙提供C#代码?我需要每个列值都在一个单元格中。准确地说,我需要在Excel文件中得到与DataTable完全相同的外观副本。请求帮助。
谢谢, Vix
使用这段代码...
dt = city.GetAllCity();//your datatable
string attachment = "attachment; filename=city.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/vnd.ms-excel";
string tab = "";
foreach (DataColumn dc in dt.Columns)
{
Response.Write(tab + dc.ColumnName);
tab = "\t";
}
Response.Write("\n");
int i;
foreach (DataRow dr in dt.Rows)
{
tab = "";
for (i = 0; i < dt.Columns.Count; i++)
{
Response.Write(tab + dr[i].ToString());
tab = "\t";
}
Response.Write("\n");
}
Response.End();
// Example data
DataTable table = new DataTable();
table.Columns.AddRange(new[]{ new DataColumn("Key"), new DataColumn("Value") });
foreach (string name in Request.ServerVariables)
table.Rows.Add(name, Request.ServerVariables[name]);
// This actually makes your HTML output to be downloaded as .xls file
Response.Clear();
Response.ClearContent();
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=ExcelFile.xls");
// Create a dynamic control, populate and render it
GridView excel = new GridView();
excel.DataSource = table;
excel.DataBind();
excel.RenderControl(new HtmlTextWriter(Response.Output));
Response.Flush();
Response.End();
(SERVER_PORT_SECURE, SERVER_PROTOCOL, SERVER_SOFTWARE)
,我不太清楚这是什么...似乎更好的方法是我们不需要覆盖VerifyRenderingInServerForm
...你能帮我吗? - samonclick
事件中调用它。 - sam dt = city.GetAllCity();//your datatable
using (XLWorkbook wb = new XLWorkbook())
{
wb.Worksheets.Add(dt);
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment;filename=GridView.xlsx");
using (MemoryStream MyMemoryStream = new MemoryStream())
{
wb.SaveAs(MyMemoryStream);
MyMemoryStream.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
}
}
本文是关于ASP.NET GridView导出到Excel时遇到“您尝试打开的文件与文件扩展名指定的格式不同”的解决方案。 using System;
using System.Data;
using System.IO;
using System.Windows.Forms;
namespace ExportExcel
{
public partial class ExportDatatabletoExcel : Form
{
public ExportDatatabletoExcel()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
//Add Datacolumn
DataColumn workCol = dt.Columns.Add("FirstName", typeof(String));
dt.Columns.Add("LastName", typeof(String));
dt.Columns.Add("Blog", typeof(String));
dt.Columns.Add("City", typeof(String));
dt.Columns.Add("Country", typeof(String));
//Add in the datarow
DataRow newRow = dt.NewRow();
newRow["firstname"] = "Arun";
newRow["lastname"] = "Prakash";
newRow["Blog"] = "http://royalarun.blogspot.com/";
newRow["city"] = "Coimbatore";
newRow["country"] = "India";
dt.Rows.Add(newRow);
//open file
StreamWriter wr = new StreamWriter(@"D:\\Book1.xls");
try
{
for (int i = 0; i < dt.Columns.Count; i++)
{
wr.Write(dt.Columns[i].ToString().ToUpper() + "\t");
}
wr.WriteLine();
//write rows to excel file
for (int i = 0; i < (dt.Rows.Count); i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
if (dt.Rows[i][j] != null)
{
wr.Write(Convert.ToString(dt.Rows[i][j]) + "\t");
}
else
{
wr.Write("\t");
}
}
//go to next line
wr.WriteLine();
}
//close file
wr.Close();
}
catch (Exception ex)
{
throw ex;
}
}
}
}
我在页面中使用了这个。
public void DTToExcel(DataTable dt)
{
// dosya isimleri ileride aynı anda birden fazla kullanıcı aynı dosya üzerinde işlem yapmak ister düşüncesiyle guid yapıldı.
string FileName = Guid.NewGuid().ToString();
FileInfo f = new FileInfo(Server.MapPath("Downloads") + string.Format("\\{0}.xlsx", FileName));
if (f.Exists)
f.Delete(); // delete the file if it already exist.
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.ClearHeaders();
response.ClearContent();
response.Charset = Encoding.UTF8.WebName;
response.AddHeader("content-disposition", "attachment; filename=" + FileName + ".xls");
response.AddHeader("Content-Type", "application/Excel");
response.ContentType = "application/vnd.xlsx";
//response.AddHeader("Content-Length", file.Length.ToString());
// create a string writer
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw)) //datatable'a aldığımız sorguyu bir datagrid'e atayıp html'e çevir.
{
// instantiate a datagrid
DataGrid dg = new DataGrid();
dg.DataSource = dt;
dg.DataBind();
dg.RenderControl(htw);
response.Write(sw.ToString());
dg.Dispose();
dt.Dispose();
response.End();
}
}
}
VerifyRenderingInServerForm
.... Volkan,我非常感谢你在每行上设置注释以解释发生了什么,这对于其他人也很有用.. 我推荐这种方式给亲爱的搜索者们。 - sam//response.AddHeader("Content-Length", file.Length.ToString());
- sam var lines = new List<string>();
string[] columnNames = dt.Columns.Cast<DataColumn>().
Select(column => column.ColumnName).
ToArray();
var header = string.Join(",", columnNames);
lines.Add(header);
var valueLines = dt.AsEnumerable()
.Select(row => string.Join(",", row.ItemArray));
lines.AddRange(valueLines);
File.WriteAllLines("excel.csv", lines);
Excel导出的可用代码
try
{
DataTable dt = DS.Tables[0];
string attachment = "attachment; filename=log.xls";
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/vnd.ms-excel";
string tab = "";
foreach (DataColumn dc in dt.Columns)
{
Response.Write(tab + dc.ColumnName);
tab = "\t";
}
Response.Write("\n");
int i;
foreach (DataRow dr in dt.Rows)
{
tab = "";
for (i = 0; i < dt.Columns.Count; i++)
{
Response.Write(tab + dr[i].ToString());
tab = "\t";
}
Response.Write("\n");
}
Response.End();
}
catch (Exception Ex)
{ }
大多数答案实际上是生成 CSV,但我在 Excel 中打开时并不总是有良好的体验。
另一种方法是使用 ACE OLEDB Provider(也可以参见Excel 的连接字符串)。当然,您必须安装和注册提供程序。如果您安装了 Excel,则已经拥有它,但这是部署时需要考虑的问题(例如,在 Web 服务器上)。
在下面的帮助程序类代码中,您需要调用类似于 ExportHelper.CreateXlsFromDataTable(dataset.Tables[0], @"C:\tmp\export.xls");
的内容。
public class ExportHelper
{
private const string ExcelOleDbConnectionStringTemplate = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 8.0;HDR=YES\";";
/// <summary>
/// Creates the Excel file from items in DataTable and writes them to specified output file.
/// </summary>
public static void CreateXlsFromDataTable(DataTable dataTable, string fullFilePath)
{
string createTableWithHeaderScript = GenerateCreateTableCommand(dataTable);
using (var conn = new OleDbConnection(String.Format(ExcelOleDbConnectionStringTemplate, fullFilePath)))
{
if (conn.State != ConnectionState.Open)
{
conn.Open();
}
OleDbCommand cmd = new OleDbCommand(createTableWithHeaderScript, conn);
cmd.ExecuteNonQuery();
foreach (DataRow dataExportRow in dataTable.Rows)
{
AddNewRow(conn, dataExportRow);
}
}
}
private static void AddNewRow(OleDbConnection conn, DataRow dataRow)
{
string insertCmd = GenerateInsertRowCommand(dataRow);
using (OleDbCommand cmd = new OleDbCommand(insertCmd, conn))
{
AddParametersWithValue(cmd, dataRow);
cmd.ExecuteNonQuery();
}
}
/// <summary>
/// Generates the insert row command.
/// </summary>
private static string GenerateInsertRowCommand(DataRow dataRow)
{
var stringBuilder = new StringBuilder();
var columns = dataRow.Table.Columns.Cast<DataColumn>().ToList();
var columnNamesCommaSeparated = string.Join(",", columns.Select(x => x.Caption));
var questionmarkCommaSeparated = string.Join(",", columns.Select(x => "?"));
stringBuilder.AppendFormat("INSERT INTO [{0}] (", dataRow.Table.TableName);
stringBuilder.Append(columnNamesCommaSeparated);
stringBuilder.Append(") VALUES(");
stringBuilder.Append(questionmarkCommaSeparated);
stringBuilder.Append(")");
return stringBuilder.ToString();
}
/// <summary>
/// Adds the parameters with value.
/// </summary>
private static void AddParametersWithValue(OleDbCommand cmd, DataRow dataRow)
{
var paramNumber = 1;
for (int i = 0; i <= dataRow.Table.Columns.Count - 1; i++)
{
if (!ReferenceEquals(dataRow.Table.Columns[i].DataType, typeof(int)) && !ReferenceEquals(dataRow.Table.Columns[i].DataType, typeof(decimal)))
{
cmd.Parameters.AddWithValue("@p" + paramNumber, dataRow[i].ToString().Replace("'", "''"));
}
else
{
object value = GetParameterValue(dataRow[i]);
OleDbParameter parameter = cmd.Parameters.AddWithValue("@p" + paramNumber, value);
if (value is decimal)
{
parameter.OleDbType = OleDbType.Currency;
}
}
paramNumber = paramNumber + 1;
}
}
/// <summary>
/// Gets the formatted value for the OleDbParameter.
/// </summary>
private static object GetParameterValue(object value)
{
if (value is string)
{
return value.ToString().Replace("'", "''");
}
return value;
}
private static string GenerateCreateTableCommand(DataTable tableDefination)
{
StringBuilder stringBuilder = new StringBuilder();
bool firstcol = true;
stringBuilder.AppendFormat("CREATE TABLE [{0}] (", tableDefination.TableName);
foreach (DataColumn tableColumn in tableDefination.Columns)
{
if (!firstcol)
{
stringBuilder.Append(", ");
}
firstcol = false;
string columnDataType = "CHAR(255)";
switch (tableColumn.DataType.Name)
{
case "String":
columnDataType = "CHAR(255)";
break;
case "Int32":
columnDataType = "INTEGER";
break;
case "Decimal":
// Use currency instead of decimal because of bug described at
// http://social.msdn.microsoft.com/Forums/vstudio/en-US/5d6248a5-ef00-4f46-be9d-853207656bcc/localization-trouble-with-oledbparameter-and-decimal?forum=csharpgeneral
columnDataType = "CURRENCY";
break;
}
stringBuilder.AppendFormat("{0} {1}", tableColumn.ColumnName, columnDataType);
}
stringBuilder.Append(")");
return stringBuilder.ToString();
}
}
尽管不是.NET实现,但您可能会发现插件TableTools
对于您的受众非常有效。它依赖于Flash,这在大多数需要深入工作并想要记录表格信息的情况下不应该成为问题。
最新版本似乎支持将内容复制到剪贴板、CSV、".XLS"(实际上只是一个名为.xls的制表符分隔文件),PDF,或创建一个打印友好页面版本,其中显示所有行和其余页面内容隐藏。
我在DataTables网站上找到了该扩展程序,链接在此处:http://datatables.net/extras/tabletools/
下载可在插件(额外)页面上获得,链接在此处:http://datatables.net/extras/
据说它是DataTables的一部分进行下载(因此出现了短语“Extras included in the DataTables package”),但我没有在我使用的下载中找到它。看起来运行得非常好!
public void UpdateExcelApplication(SqlDataTable dataTable)
{
var objects = new string[dataTable.Rows.Count, dataTable.Columns.Count];
var rowIndex = 0;
foreach (DataRow row in dataTable.Rows)
{
var colIndex = 0;
foreach (DataColumn column in dataTable.Columns)
{
objects[rowIndex, colIndex++] = Convert.ToString(row[column]);
}
rowIndex++;
}
var range = this.workSheet.Range[$"A3:FW{dataTable.Rows.Count + 2}"];
range.Value = objects;
this.workSheet.Columns.AutoFit();
this.workSheet.Rows.AutoFit();
}