C# WebRequest 发送表单数据大小限制

Question

我正在尝试在 WebRequest 中发送表单数据。

该函数工作正常并按预期返回“成功”响应流。

但是，如果“data”变量的长度超过 30,000 个字符，我会遇到 HTTP 500 错误:

Message "The remote server returned an error: (500) Internal Server Error." 

这是我发送数据的“测试”函数:

 public IActionResult Test()
 {
     var data = "[0].meetingDate=2019-07-17&[0].courseId=9& 
                        [0].raceNumber=1&[0].horseCode=000000500523";

     //THIS MAKES THE REQUEST ERROR BY INCREASING THE SIZE OF THE DATA WHICH THEN GENERATES A ERROR
     for( int i = 0; i < 400; i++)
     {
         data = data + "[0].meetingDate=2019-07-17&[0].courseId=9&[0].raceNumber=1&[0].horseCode=000000500523";
     }
     //////////////////////////

     WebRequest request = WebRequest.Create("https://localhost:44374/HorseRacingApi/Prices/GetPriceForEntries");
     request.Method = "POST";

     if (!string.IsNullOrEmpty(data))
     {
         byte[] dataBytes = Encoding.ASCII.GetBytes(data);

         request.ContentType = "application/x-www-form-urlencoded";
         request.ContentLength = dataBytes.Length;

         using (Stream requestDataStream = request.GetRequestStream())
         {
             requestDataStream.Write(dataBytes, 0, dataBytes.Length);
             requestDataStream.Flush();
         }
     }

     HttpWebResponse response = (HttpWebResponse)request.GetResponse();
     Stream receiveStream = response.GetResponseStream();

     StreamReader readStream = new StreamReader(receiveStream);

     Debug.WriteLine("Response stream received.");

     string responseMsg = readStream.ReadToEnd();

     Debug.WriteLine(responseMsg);

     response.Close();
     readStream.Close();

     return Ok(responseMsg);
 }

这是我的“GetPriceForEntries”函数:

[HttpPost]
[DisableRequestSizeLimit]
[Route("GetPriceForEntries")]
public JsonResult GetPricesForEntries([FromForm] List<JsonEntryKey> Entries, bool? ShowAll)
{
    return Json("Success");
    //return Json(_priceService.GetPriceForEntries(entries));
}

不幸的是，我无法更改“测试”函数发送数据的方式。当其他应用程序使用此功能时，它必须保持相同的兼容性。

有没有办法增加 HTTP WebRequest 流可以执行的大小限制或禁用该限制？

顺便说一句，我在 .NET Core 上使用 MVC。

编辑:将以下内容添加到 Web.config 后仍然没有运气:

  <security>
    <requestFiltering>
      <!-- This will handle requests up to 50MB -->
      <requestLimits maxAllowedContentLength="52428800" />
    </requestFiltering>
  </security>

编辑 2:经过进一步调查，这是我在阅读 WebException 响应后收到的以下错误:

        <h1>An unhandled exception occurred while processing the request.</h1>
        <div class="titleerror">InvalidDataException: Form value count limit 1024 exceeded.</div>
            <p class="location">Microsoft.AspNetCore.WebUtilities.FormReader.Append(ref KeyValueAccumulator accumulator)</p>

Answer 1

修复了使用函数上方的以下代码段来设置表单限制的问题。

        [RequestFormLimits(ValueCountLimit = int.MaxValue)]

默认限制为 1024。