c# – WCF数据服务：尽管服务设置为v3,但MaxProtocolVersion设置为v2.结束OfType()的投掷错误

概述我遇到的问题是,当我尝试使用OfType()方法对我的odata服务进行 linq查询时,我收到一条错误消息,指出该请求对于版本2服务无效.我创建了WCF数据服务并将MaxProtocolVersion设置为v3. public class TestDirectorySearch : DataService<TestDirectoryEntities>{ public static vo 我遇到的问题是,当我尝试使用Oftype()方法对我的odata服务进行 linq查询时,我收到一条错误消息,指出该请求对于版本2服务无效.我创建了WCF数据服务并将MaxProtocolVersion设置为v3.

public class TestDirectorySearch : DataService<TestDirectoryEntitIEs>{    public static voID InitializeService(DataServiceConfiguration config)    {        config.SetEntitySetAccessRule("*",EntitySetRights.AllRead);        config.SetEntitySetPageSize("*",50);        config.UseVerboseErrors = true;        config.DataServiceBehavior.MaxProtocolVersion = System.Data.Services.Common.DataServiceProtocolVersion.V3;    }}

我的edmx有以下几行：

<edmx:DataServices m:DataServiceVersion="1.0"     m:MaxDataServiceVersion="3.0"     xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/Metadata">

当我尝试执行以下查询时,指出当MaxProtocolVersion小于’3.0’时,不支持“方法’OfType’.”

from test in context.Tests.OfType<OrderableTest>()    where test.TestRevisionID.Equals(mmt.RevisionID)    select new    {            Reflex = test.ReflexTest,ShipTemp = (test.SpecimenTemperature == null) ? null : test.SpecimenTemperature.displayDescription    }).FirstOrDefault();

如果我检查上下文的MaxProtocolVersion,则将其设置为v2.在什么时候失败了？我该怎么做才能正确设置？

确切的错误：

{“当MaxProtocolVersion小于’3.0’时,不支持’OfType’方法.”}

请求的堆栈跟踪：

at System.Data.Services.ClIEnt.ResourceBinder.AnalyzeOfType(MethodCallExpression mce,DataServiceProtocolVersion maxProtocolVersion)at System.Data.Services.ClIEnt.ResourceBinder.VisitMethodCall(MethodCallExpression mce)at System.Data.Services.ClIEnt.AlinqExpressionVisitor.Visit(Expression exp)at System.Data.Services.ClIEnt.DataServiceAlinqExpressionVisitor.Visit(Expression exp)at System.Data.Services.ClIEnt.AlinqExpressionVisitor.VisitExpressionList(ReadonlyCollection`1 original)at System.Data.Services.ClIEnt.AlinqExpressionVisitor.VisitMethodCall(MethodCallExpression m)at System.Data.Services.ClIEnt.ResourceBinder.VisitMethodCall(MethodCallExpression mce)at System.Data.Services.ClIEnt.AlinqExpressionVisitor.Visit(Expression exp)at System.Data.Services.ClIEnt.DataServiceAlinqExpressionVisitor.Visit(Expression exp)at System.Data.Services.ClIEnt.ResourceBinder.AnalyzeProjection(MethodCallExpression mce,SequenceMethod sequenceMethod,Expression& e)at System.Data.Services.ClIEnt.ResourceBinder.VisitMethodCall(MethodCallExpression mce)at System.Data.Services.ClIEnt.AlinqExpressionVisitor.Visit(Expression exp)at System.Data.Services.ClIEnt.DataServiceAlinqExpressionVisitor.Visit(Expression exp)at System.Data.Services.ClIEnt.AlinqExpressionVisitor.VisitExpressionList(ReadonlyCollection`1 original)at System.Data.Services.ClIEnt.AlinqExpressionVisitor.VisitMethodCall(MethodCallExpression m)at System.Data.Services.ClIEnt.ResourceBinder.VisitMethodCall(MethodCallExpression mce)at System.Data.Services.ClIEnt.AlinqExpressionVisitor.Visit(Expression exp)at System.Data.Services.ClIEnt.DataServiceAlinqExpressionVisitor.Visit(Expression exp)at System.Data.Services.ClIEnt.ResourceBinder.Bind(Expression e,DataServiceContext context)at System.Data.Services.ClIEnt.DataServicequeryProvIDer.Translate(Expression e)at System.Data.Services.ClIEnt.DataServicequery`1.Translate()at System.Data.Services.ClIEnt.DataServicequery`1.Execute()at System.Data.Services.ClIEnt.DataServicequery`1.GetEnumerator()at System.linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)at System.Data.Services.ClIEnt.DataServicequeryProvIDer.ReturnSingleton[TElement](Expression Expression)at System.Data.Services.ClIEnt.DataServicequeryProvIDer.Execute[TResult](Expression Expression)at System.linq.queryable.FirstOrDefault[TSource](Iqueryable`1 source)at TDMixBLL.TestDirectoryServiceHandler.PopulateOrderableTestInfo(MonitoredMixTest mmt) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 161at TDMixBLL.TestDirectoryServiceHandler.PopulateTestInfo(MonitoredMixTest test) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 124at TDMixBLL.TestDirectoryServiceHandler.GetTest(Int64 testRevisionID) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 112at TDMixBLL.TestDirectoryServiceHandler.PopulateTests(List`1 teststopopulate) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 66at TDMix2.Tests.TestRetrIEvalTests.TestPopulate() in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMix2.Tests\TestRetrIEvalTests.cs:line 38

解决方法 这是客户端上的错误. DataServiceContext必须用V3构造,以支持V3功能(如OfType). DataServiceContext有一个新的构造函数重载,它接受MaxProtocolVersion参数.确保使用它并传入V3. 总结

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