小编Arn*_*ing的帖子

在Silverlight,Windows Phone 7的项目我创建一个HttpWebRequest的,得到RequestStream,写的东西进入流,并得到响应,但我总是得到NotSupportedException异常:"System.Net.Browser.OHWRAsyncResult.AsyncWaitHandle抛出类型'System.NotSupportedException'的异常

我的生产代码要复杂得多,但我可以将其缩小到这一小段代码:

public class HttpUploadHelper
{
    private HttpWebRequest request;
    private RequestState state = new RequestState();

    public HttpUploadHelper(string url)
    {
        this.request = WebRequest.Create(url) as HttpWebRequest;
        state.Request = request;
    }

    public void Execute()
    {
        request.Method = "POST";
        this.request.BeginGetRequestStream(
            new AsyncCallback(BeginRequest), state);
    }

    private void BeginRequest(IAsyncResult ar)
    {
        Stream stream = state.Request.EndGetRequestStream(ar);
        state.Request.BeginGetResponse(
            new AsyncCallback(BeginResponse), state);
    }

    private void BeginResponse(IAsyncResult ar)
    {
        // BOOM: NotSupportedException was unhandled; 
        // {System.Net.Browser.OHWRAsyncResult}
        // AsyncWaitHandle = 'ar.AsyncWaitHandle' threw an 
        // exception of type 'System.NotSupportedException'
        HttpWebResponse …