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当我尝试使用 DataServiceCollection.loadAsync() 从远程 WCF 数据服务加载数据时，我总是得到一个空集合，比如

    CloudEDUEntities ctx = new CloudEDUEntities(uri);
    DataServiceCollection<COURSE> dsc = new DataServiceCollection<COURSE>();
    var query = from p in ctx.COURSEs select p;
    dsc.LoadAsync(query);//The count of dsc will always be 0
    dsc.LoadCompleted += new EventHandler<LoadCompletedEventArgs>(complete);

然后我用 loadCompleted 方法检查了状态，发现有错误，比如：

    System.InvalidOperationException: An error occurred while processing this request. ---> System.Data.Services.Http.WebException: Unable to connect to the remote server ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: An attempt was made to access a socket in a way forbidden by its access permissions 10.0.1.39:8080
       at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
       at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
       --- End of inner exception stack trace ---
       at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
       at System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
       --- End of inner exception stack trace ---
       at System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
       at System.Data.Services.Client.HttpWebRequestMessage.EndGetResponse(IAsyncResult asyncResult)
       at System.Data.Services.Client.ODataRequestMessageWrapper.EndGetResponse(IAsyncResult asyncResult)
       at System.Data.Services.Client.WebUtil.GetResponseHelper(ODataRequestMessageWrapper request, DataServiceContext context, IAsyncResult asyncResult, Boolean handleWebException)
       at System.Data.Services.Client.WebUtil.EndGetResponse(ODataRequestMessageWrapper request, IAsyncResult asyncResult, DataServiceContext context)
       at System.Data.Services.Client.QueryResult.AsyncEndGetResponse(IAsyncResult asyncResult)
       --- End of inner exception stack trace ---
       at System.Data.Services.Client.BaseAsyncResult.EndExecute[T](Object source, String method, IAsyncResult asyncResult)
       at System.Data.Services.Client.QueryResult.EndExecuteQuery[TElement](Object source, String method, IAsyncResult asyncResult)
       at System.Data.Services.Client.DataServiceRequest.EndExecute[TElement](Object source, DataServiceContext context, String method, IAsyncResult asyncResult)
       at System.Data.Services.Client.DataServiceQuery`1.EndExecute(IAsyncResult asyncResult)
       at System.Data.Services.Client.DataServiceCollection`1.<>c__DisplayClass2.<LoadAsync>b__1(IAsyncResult asyncResult)
       at System.Data.Services.Client.DataServiceCollection`1.EndLoadAsyncOperation(Func`2 endCall, IAsyncResult asyncResult)

我高度怀疑这是由服务器引起的问题。但是我仍然可以使用浏览器查看带有 URL 的数据服务。因此，我检查了服务器端，8080端口是开放的，我什至在服务器项目的根目录下添加了一个clientaccesspolicy.xml。内容：

    <?xml version="1.0" encoding="utf-8"?> 
    <access-policy>
      <cross-domain-access>
        <policy>
          <allow-from http-request-headers="*">
            <domain uri="*"/>
          </allow-from>
          <grant-to>
        <socket-resource port="8080" protocol="tcp" />
          </grant-to>
        </policy>
      </cross-domain-access>
    </access-policy>

我关闭了防火墙，但客户端仍然无法成功加载数据。我的服务器在带有 SQL Server 2012 的 Windows Server 2008 上。相同的 WCF 数据服务部署在运行 Windows 7 的服务器上，客户端可以成功地从中加载数据。

我希望有人能帮我找出原因。提前谢谢。

顺便说一句，相同的代码在控制台项目中运行顺利。

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1 回答 1

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根据您的描述，我认为不存在IP冲突或端口占用，因为相同的代码在您的控制台项目中运行顺利。您应该检查您的 Windows 应用商店应用程序的.appxmanifest文件，并确保您已在功能选项卡中检查了专用网络（客户端和服务器）。

专用网络（客户端和服务器）功能提供通过防火墙对家庭和工作网络的入站和出站访问。此功能通常用于跨局域网 (LAN) 进行通信的游戏，以及跨各种本地设备共享数据的应用程序。

您可以在此处获取有关功能的更多信息。

于 2013-07-29T02:58:20.913 回答