我试图调试a具体的问题，我的ASP.NET应用程序。客户端运行以下code：

I'm trying to debug a specific issue with my ASP.NET application. The client runs the following code:

void uploadFile( string serverUrl, string filePath )
{
    HttpWebRequest request = (HttpWebRequest)HttpWebRequest.
        Create( serverUrl );
    CredentialCache cache = new CredentialCache();
    cache.Add( new Uri( serverUrl ), "Basic", new NetworkCredential( "User", "pass" ) );
    request.Credentials = cache;
    request.Method = "POST";
    request.ContentType = "application/octet-stream";
    request.Timeout = 60000;
    request.KeepAlive = true;

    using( BinaryReader reader = new BinaryReader( 
        File.OpenRead( filePath ) ) ) {

        request.ContentLength = reader.BaseStream.Length;
        using( Stream stream = request.GetRequestStream() ) {
            byte[] buffer = new byte[1024];
            while( true ) {
                int bytesRead = reader.Read( buffer, 0, buffer.Length );
                if( bytesRead == 0 ) {
                    break;
                }
                stream.Write( buffer, 0, bytesRead );
            }
        }
    }

     HttpWebResponse result = (HttpWebResponse)request.GetResponse();
     //handle result - not relevant
 }

和写（）抛出一个异常，无法将数据写入传输连接：一个已建立的连接被中止通过在主机中的软件文本。我用 System.Net跟踪，发现出错时，我发送带有内容长度集合的请求。

and Write() throws an exception with "Unable to write data to the transport connection: An established connection was aborted by the software in your host machine." text. I used System.Net tracing and found that something goes wrong when I send the request with Content-Length set.

具体而言，如果我省略了一切，这是里面的使用语句在code服务器上面及时与 WWW验证回复键，然后在客户端转播与请求 WWW验证键，一切都正常，只是在没有上传的文件，并要求晚得多失败。

Specifically if I omit everything that is inside using statement in the code above the server promptly replies with WWW-Authenticate and then the client reposts the request with WWW-Authenticate and everything goes fine except the file in not uploaded and the request fails much later.

我要做到以下几点：没有发送数据的请求，等待 WWW验证，然后用 WWW身份验证重蹈覆辙和数据。所以，我试图修改code以上：首先设置所有的参​​数，然后调用的GetResponse（），那么就发送，但是当我尝试设置 CONTENTLENGTH 财产引发异常，这个属性不能写入后设置已启动文本。

I'd like to do the following: send an request without data, wait for WWW-Authenticate, then repeat it with WWW-Authenticate and data. So I tried to modify the code above: first set all the parameters, then call GetResponse(), then do sending, but when I try to set ContentLength property an exception is thrown with "This property cannot be set after writing has started" text.

所以的HttpWebRequest 似乎是不可重用。

我如何重新使用它重新发送请求而不关闭连接？

How do I reuse it for resending the request without closing the connection?

推荐答案

您不要重复使用一个请求 - 顾名思义，这是一个请求。然而，如果你发出同一个主机上的多个请求，.NET将重用默认情况下，基础网络连接。

You don't reuse a request - as the name suggests, it's one request. However, if you issue multiple requests for the same host, .NET will reuse the underlying network connection by default.

请注意，您的不的需要处置的 WebResponse类按 request.GetResponse - 否则，底层基础架构将不知道你实际上是用它做，并且将无法再使用该连接