Question

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方法检查状态，发现有错误，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)

我非常怀疑这是服务器造成的问题。但我仍然可以使用浏览器查看带有URL的dataservice。因此，我检查了服务器端，8080端口是打开的，我甚至将一个clientaccesspolicy.xml添加到服务器项目的根目录。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Windows Server 2008上，带有SQL Server 2012。在Windows 7上运行的服务器上部署了相同的WCF Dataservices，客户端可以从中成功加载数据。

我希望有人能帮助我找出原因。 Thx提前。

BTW，相同的代码在控制台项目中顺利运行。

Answer 1

根据您的描述，我认为没有IP矛盾或端口占用，因为相同的代码在您的控制台项目中顺利运行。您应该检查Windows应用商店应用的.appxmanifest文件，并确保已选中 capibilities 标签中的专用网络（Clien＆amp; Server）。

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

You can get more information about capibilities here.

使用Store APP连接到WCF数据服务时出现System.Net.Sockets.SocketException

1 个答案: