Silerlight 安全性错误

[cctsong]

        private void Books_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Uri endpoint = new Uri(String.Format("http://hocalhost:26066/BookHandler.ashx?No={0}", Books.SelectedIndex));
            WebClient client = new WebClient();

            client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(abc);
            client.DownloadStringAsync(endpoint);
        }

        void abc(object sender, DownloadStringCompletedEventArgs e)
        {
            if (e.Error == null)
            {
                lblPrice.Text = "价格：" + e.Result;
                lblPrice.Text = e.Error.Message;
            }
        }

执行 Books_SelectionChanged 事件，正常能从BookHandler.ashx中获取返回值，但在abc 的e.Error中不能获取返回值。

异常信息：
- e.Error {System.Security.SecurityException ---> System.Security.SecurityException: 安全性错误。
位于 System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
位于 System.Net.Browser.BrowserHttpWebRequest.<>c__DisplayClass5.<EndGetResponse>b__4(Object sendState)
位于 System.Net.Browser.AsyncHelper.<>c__DisplayClass2.<BeginOnUI>b__0(Object sendState)
--- 内部异常堆栈跟踪的结尾 ---
位于 System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
位于 System.Net.Browser.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
位于 System.Net.WebClient.GetWebResponse(WebRequest request, IAsyncResult result)
位于 System.Net.WebClient.DownloadBitsResponseCallback(IAsyncResult result)} System.Exception {System.Security.SecurityException}

Books_SelectionChanged是调用别的项目里面的 BookHandler.ashx的，我也在 BookHandler.ashx的根目录下面加了clientaccesspolicy.xml

<?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>

但是还是一样的错误，本人silverlight新手。。请各位大侠指点下~~ T.T

[sundayX]

1、hocalhost是什么东西？localhost？
2、e.Error中是错误信息，怎么会获得返回值？
3、既然e.Error==null了，你再取e.Error.Message能取出来么？
4、这种问题一般是策略文件导致，无法找到策略文件引起。silverlight5可以提升浏览器权限来消去该问题，silverlight4及以下需要在服务端添加策略文件。

[jv9]

“但在abc 的e.Error中不能获取返回值。”这句什么意思？是使用了其他域名么？ 你使用自定义端口，能确认这个端口在目标服务器是正常的么？

[cctsong]

手误，将 localhost给拼错了

[Blessed_Chuan]

请问解决了吗？
我也遇到了

  private void Button_Click(object sender, RoutedEventArgs e)
        {
            string topic = SearchTxt.Text;
        
            string diggurl = string.Format("http://services.digg.com/stories/topic/{0}?count=20&appkey=http%3A%2F%2Fscottgu.com",topic);
            //string diggurl = "http://services.digg.com/stories"; 
            WebClient diggservice = new WebClient();
            diggservice.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DiggService_DownloadStoriesCompleted);
            diggservice.DownloadStringAsync(new Uri(diggurl));
        }
        void DiggService_DownloadStoriesCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            if (e.Error == null)
            {
                string result = e.Result;
                DisplayStories(result);

                //可以在这里写解析xml
            }
        }