c# - .NET Winforms c# 上传大文件

Question

当文件长度高于 18 mb 时，我收到此错误:

stream does not support concurrent IO read or write operations

错误已定位在本节中:

requestStream.Write(header, 0, header.Length);
if (fileData != null)
{
     // write the file data, if any
     byte[] buffer = new Byte[checked((uint)Math.Min(8192, (int)fileData.Length))];
     int bytesRead;

     try
     {
          while ((bytesRead = fileData.Read(buffer, 0, buffer.Length)) != 0)
          {
               //throws an exception after 3000 loops aprox
               requestStream.Write(buffer, 0, bytesRead);
          }
     }
     catch (Exception ex)
     {
          string aux = ex.Message;
     }
}

// write footer
requestStream.Write(footer, 0, footer.Length);
return webrequest.GetResponse();

我尝试使用lock语句，sendChunked = true和AllowWriteStreamBuffering = false但我无法正确上传文件。

提前致谢

Answer 1

也许当循环尝试将数据上传(写入)到流时，Web 服务器会发送一条错误消息(读取)，指出已超出大小限制。您可以尝试使用 Wireshark 或其他网络嗅探器检查服务器和程序之间发送的内容。