MVVMCross + Xamarin + WCF數據服務5.6 =未實現異常？

Question

我在MVVMCross的PCL項目中使用WCF Data Services 5.6。在WPF客戶端下面的代碼（在視圖模型）的作品就像一個魅力（基於在http://msdn.microsoft.com/en-us/library/dd756367(v=vs.110).aspx發現樣品）：

DataServiceQuery<T> query = this.LoadItemsQuery; 
query.BeginExecute((result) => 
     { 
      try 
      { 
       DataServiceQuery<T> resultQuery = result.AsyncState as DataServiceQuery<T>; 

       foreach (T item in resultQuery.EndExecute(result)) 
       { 
        // Do something here 
       } 
      } 
      catch (Exception ex) 
      { 
       PublishException(ex); 
      } 
     } 
     , query); 

但在Android客戶端，「resultQuery.EndExecute（結果）」拋出以下例外：

System.InvalidOperationException: An error occurred while processing this request. ---> System.NotImplementedException: The requested feature is not implemented. 
    at System.Net.WebResponse.get_SupportsHeaders() [0x00000] in <filename unknown>:0 
    at System.Data.Services.Client.HttpWebRequestMessage.EndGetResponse (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
    at System.Data.Services.Client.ODataRequestMessageWrapper.EndGetResponse (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
    at System.Data.Services.Client.DataServiceContext.GetResponseHelper (System.Data.Services.Client.ODataRequestMessageWrapper request, IAsyncResult asyncResult, Boolean handleWebException) [0x00000] in <filename unknown>:0 
    at System.Data.Services.Client.DataServiceContext.EndGetResponse (System.Data.Services.Client.ODataRequestMessageWrapper request, IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
    at System.Data.Services.Client.RequestInfo.EndGetResponse (System.Data.Services.Client.ODataRequestMessageWrapper request, IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
    at System.Data.Services.Client.QueryResult.AsyncEndGetResponse (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
    --- End of inner exception stack trace --- 
    at System.Data.Services.Client.BaseAsyncResult.EndExecute[QueryResult] (System.Object source, System.String method, IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
    at System.Data.Services.Client.QueryResult.EndExecuteQuery[Appointment] (System.Object source, System.String method, IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 } 

任何想法？有人用MonoDroid測試過WCF Data Services 5.6嗎？

在此先感謝

Answer 1

https://github.com/mono/mono/blob/master/mcs/class/System/System.Net/WebResponse.cs

你可以從它確實沒有實現的源代碼見。

Mono的WCF支持不完整，因此將其用於WCF數據服務存在風險。

如果可能，請在服務器端使用ASP.NET Web API而不是WCF，然後在客戶端通過HttpClient獲得更好的支持。

Answer 2

bug是HttpWebResponse.cs，應增加以下內容：

public override bool SupportsHeaders 
{ 
    get 
    { 
     return true; 
    } 
} 

Answer 3

應與最新發布的工作：單聲道爲Android 4.12.3.I測試，發現它與Microsoft.Data工作。 Service.Client.Portable.dll。