WCF Data Services with Entity Framework with View包含Xml

我們有一個包含一些XML字段的SQL Server視圖。我們首先使用Entity Framework（v5）數據庫創建了一個DBContext。我們增加了一個WCF數據服務，並將其分配到的DbContext，如：WCF Data Services with Entity Framework with View包含Xml

 public class ProductsDBSvc : DataService<ProductsDBEntities> 
     { 
     config.UseVerboseErrors = true; 

     config.SetEntitySetPageSize("vw_Release", 100); 
     config.SetEntitySetAccessRule("vw_Release", EntitySetRights.AllRead); 
     }

使用的瀏覽器，我們做這樣的判斷http://localhost:60606/Products/vw_Release但它返回下面的錯誤：

<m:internalexception> 
<m:message> 
The XML data type cannot be compared or sorted, except when using the IS NULL operator. 
</m:message> 
<m:type>System.Data.SqlClient.SqlException</m:type> 
<m:stacktrace> 
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception,   Boolean breakConnection, Action`1 wrapCloseInAction) 
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) 
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) 
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) 
at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() 
at System.Data.SqlClient.SqlDataReader.get_MetaData() 
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds,  RunBehavior runBehavior, String resetOptionsString) 
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) 
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) 
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) 
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) 
at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) 
at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) 
at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) 
</m:stacktrace> 
</m:internalexception>

的錯誤意味着我們不能使用order by子句中的XML列，這是一個SQL Server錯誤。儘管我們從未在查詢中詢問過訂單。

因此，我們激活了SQL事件探查器，我們發現了以下信息： 1-實體框架引用視圖（而不是表）的OData WCF服務發送一個SQL語句，其中包含像這樣的每個列的順序：

SELECT 
    [vw_Release].[ID] AS [ID], 
    [vw_Release].[TypeNameXml] AS [TypeNameXml], 
    [vw_Release].[StatusNameXml] AS [StatusNameXml], 
    [vw_Release].[Created] AS [Created], 
    [vw_Release].[Modified] AS [Modified], 
    FROM [dbo].[vw_Release] AS [vw_Release]) AS [Extent1] 
) AS [Project1] 
    ORDER BY [Project1].[Created] ASC, 
    [Project1].[ID] ASC, [Project1].[Modified] ASC, 
    [Project1].[StatusNameXml] ASC, [Project1].[TypeNameXml] ASC

2-獲取同樣的信息，但是從表而不是一個視圖僅僅閱讀發送：

SELECT 
    [Release].[ID] AS [ID], 
    [Release].[TypeNameXml] AS [TypeNameXml], 
    [Release].[StatusNameXml] AS [StatusNameXml], 
    [Release].[Created] AS [Created], 
    [Release].[Modified] AS [Modified], 
    FROM [dbo].[Release] AS [vw_Release]) AS [Extent1] 
    ORDER BY [Project1].[Created] ASC, 
    [Extent1].[ID] ASC

所有我們所做的事情是超出一切的箱子功能，並可以很容易地轉載。是否有辦法告訴WCF數據服務不要包含所有列的排序？

來源

2015-10-20 Mohamed Atia