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 161 at TDMixBLL.TestDirectoryServiceHandler.PopulateTestInfo(MonitoredMixTest test) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 124 at TDMixBLL.TestDirectoryServiceHandler.GetTest(Int64 testRevisionId) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 112 at TDMixBLL.TestDirectoryServiceHandler.PopulateTests(List`1 testsToPopulate) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 66 at TDMix2.Tests.TestRetrievalTests.TestPopulate() in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMix2.Tests\TestRetrievalTests.cs:line 38
