WebRequest只能访问在同一webContainer中的资源吗？

Question

跟随TerryLee的教程一步一步学SL。做到webrequest资源调用时发现一个问题：

http://localhost:49955/BookHandler.ashx是我要访问的服务，下面是客户端代码，我发现如果客户端代码和服务端代码在同一个webContainer中（即都在http://localhost:49955下才能正确的返回结果）。但在不同的Container运行（同一台机器上只是端口不同也不行）则不能返回任何结果。

 

传说中的跨域访问问题我已经考虑到了。wwwroot和服务（http://localhost:49955）所在目录下我都放了clientaccesspolicy.xml。

 

实在想不出这是什么问题，都弄了两天了。。。。那位高人知道什么问题？

 

 

Code Snippet

 

    public partial class Page : UserControl
    {
        public Page()
        {
            InitializeComponent();
            run();
        }
        //调用web服务
        public void run()
        {
            Uri endpoint = new Uri("http://localhost:49955/BookHandler.ashx");
            WebRequest request = WebRequest.Create(endpoint);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.BeginGetRequestStream(new AsyncCallback(RequestReady), request);
        }
        void RequestReady(IAsyncResult asyncResult)
        {
            WebRequest request = asyncResult.AsyncState as WebRequest;
            Stream requestStream = request.EndGetRequestStream(asyncResult);
            using (StreamWriter writer = new StreamWriter(requestStream))            {
                writer.Write(String.Format("No={0}", "1"));
                writer.Flush();
            }
            request.BeginGetResponse(new AsyncCallback(ResponseReady), request);
        }
        void ResponseReady(IAsyncResult asyncResult)
        {
            WebRequest request = asyncResult.AsyncState as WebRequest;
            WebResponse response = request.EndGetResponse(asyncResult);
            using (Stream responseStream = response.GetResponseStream())
            {
                StreamReader reader = new StreamReader(responseStream);
                String resultContent = reader.ReadToEnd();
                txt.Dispatcher.BeginInvoke(delegate { ProcessResult(resultContent); });
            }
        }
        //将返回结果更新到UI
        private void ProcessResult(string xmlResult)
        {
            txt.Text = xmlResult;
        }
    }

 

 

Answer 1

 

你应当用 色狼2 beta2开发的吧,同时需要增加一个:

 

crossdomain.xml

 

<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
    <allow-http-request-headers-from domain="*" headers="*"/>
</cross-domain-policy>

 

祝你成功

Answer 2

如果有crossdomain.xml
例如
http://services.digg.com/crossdomain.xml

其他网站也可以，例如

http://services.digg.com/stories/topic/programming?count=20&appkey=http%3A%2F%2Fscottgu.com

Answer 3

 

添加

clientaccesspolicy.xml

也可以

 

 

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
  <cross-domain-access>
    <policy>
      <allow-from http-request-headers="*" />
      <domain uri="*"/>
      </allow-from>
      <grant-to>
        <resource path="/" include-subpaths="true"/>
      </grant-to>
    </policy>
  </cross-domain-access>
</access-policy>

Answer 4

如果你打算在Silverlight 2 Beta 2 里面访问 Web 服务，需要使用一个ClientAccessPolicy.xml文件，此外，你的URL不能含有下划线，如 Beta1 中的 MyApp_Web等，只需将工程文件重新命名即可。

这里还有一个提示，如果服务器上已经部署了Flash的访问策略文件，将直接被Silverlight支持，不用重复部署了。

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
    <cross-domain-access>
        <policy>
            <allow-from http-request-headers="*">
                <domain uri="*"/>
            </allow-from>
            <grant-to>
                <resource path="/" include-subpaths="true"/>
            </grant-to>
        </policy>
    </cross-domain-access>
</access-policy>