在Asp.Net Core中增加上传文件大小

如果你已经滚动到这里，那说明你已经尝试了以上的解决方案。如果你正在使用最新的NET CORE版本（5.., 6..）并且使用IIS进行托管，请按照以下步骤操作。

1. Add the web.config file to your project and then add the following code there:

   <?xml version="1.0" encoding="utf-8"?>
   <configuration>
       <system.webServer>
           <security>
               <requestFiltering>
                   <!-- Handle requests up to 1 GB -->
                   <requestLimits maxAllowedContentLength="1073741824" />
               </requestFiltering>
           </security>
       </system.webServer>
   </configuration>
   

2. Set up the Form Options and IIS Server Options in your Startup.cs file like this:

    services.Configure<IISServerOptions>(options =>
    {
        options.MaxRequestBodySize = int.MaxValue;
    });
   
    services.Configure<FormOptions>(o =>
    {
        o.ValueLengthLimit = int.MaxValue;
        o.MultipartBodyLengthLimit = int.MaxValue; 
        o.MultipartBoundaryLengthLimit = int.MaxValue;
        o.MultipartHeadersCountLimit = int.MaxValue;
        o.MultipartHeadersLengthLimit = int.MaxValue;
        o.BufferBodyLengthLimit = int.MaxValue;
        o.BufferBody = true;
        o.ValueCountLimit = int.MaxValue;
    });
   

我试图上传一个大文件，但不知何故该文件未到达控制器操作方法，包括文件参数在内的所有参数仍然是null，就像这样：

[HttpPost]
public async Task<IActionResult> ImportMedicalFFSFile(
    Guid operationProgressID,
    IFormFile file, // <= getting null here
    DateTime lastModifiedDate)
{
    ...
}

[DisableRequestSizeLimit]
public class ImportedFileController : BaseController
{
    ...
}

更多信息请参见：

DisableRequestSizeLimitAttribute类

var myLargeString = "this is a large string that I want to send to the server";

$.ajax({
  type: "POST",
  url: "/MyController/MyAction",
  contentType: "application/json",
  data: JSON.stringify({ largeString: myLargeString }),
  processData: false,
  success: function (data) {
    console.log("Data received from the server: " + data);
  },
  error: function (xhr, status, error) {
  console.log("Error: " + error);
  }
});

var builder = WebApplication.CreateBuilder(args);

builder.WebHost.ConfigureKestrel(options =>
{
  long mb = 1048576;
  options.Limits.MaxRequestBodySize = 150 * mb;
});

var app = builder.Build();
app.Run();