System.Net.ProtocolViolationException：您必须在调用 [Begin]GetResponse 之前将 ContentLength 字节写入请求流

Question

我得到

"System.Net.ProtocolViolationException: You must write ContentLength bytes to the request stream before calling [Begin]GetResponse" error when calling to the "BeginGetResponse" method of the web request.

这是我的代码：

try
{
    Stream dataStream = null;
    WebRequest Webrequest;
    Webrequest = WebRequest.Create(this.EndPointAddress);
    Webrequest.Credentials = new NetworkCredential(this.username, this.password);

    Webrequest.ContentType = "text/xml";
    Webrequest.Method = WebRequestMethods.Http.Post;                    

    byteArray = System.Text.Encoding.UTF8.GetBytes(xmlRequest.Children[0].InnerXML);

    Webrequest.ContentLength = byteArray.Length;

    dataStream = Webrequest.GetRequestStream();
    dataStream.Write(byteArray, 0, byteArray.Length);                

    RequestState rs = new RequestState();
    rs.Request = Webrequest;                    

    IAsyncResult r = (IAsyncResult)Webrequest.BeginGetResponse(new AsyncCallback(RespCallback), rs);
}
catch (Exception exc)
{                    
    TRACE.EXCEPTION(exc);
}
finally
{
    dataStream.Close();
}

更具体地说，调用函数 "getRequestStream()" 后，Stream 抛出此异常的时间为：

'stream.Length' threw an exception of type 'System.NotSupportedException'

可能是什么原因造成的？

Answer 1

这终于通过使用实现了：

using (dataStream = Webrequest.GetRequestStream())
{
   dataStream.Write(byteArray, 0, byteArray.Length);
}

而不是：

dataStream = Webrequest.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);

Answer 2

您的代码应该适用于 .NET 2.0 从 4.0 开始您应该在编写后关闭流：

dataStream = Webrequest.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
datastream.Close();

Answer 3

检查以确认您的服务器设置为接受大文件。您可能会发现您运行进入了 4 兆的默认限制。

将以下内容添加到您的 web.config 文件以上传更大的文件：

<system.webServer>
    <security>
        <requestFiltering>
            <requestLimits maxAllowedContentLength="104857600" />
        </requestFiltering>
    </security>
</system.webServer>

System.Net.ProtocolViolationException：您必须在调用 [Begin]GetResponse 之前将 ContentLength 字节写入请求流

System.Net.ProtocolViolationException: You must write ContentLength bytes to the request stream before calling [Begin]GetResponse

c#

exception

webrequest

content-length