这篇博文纪录一下:当使用 EF7,Linq 实现类似 where filename in('','','')
SQL 代码,使用 Contains 出现报错问题。
project.json 配置文件(EF7 最新版本):
{
"version": "1.0.0-*",
"dependencies": {
"EntityFramework": "7.0.0-beta2-11758",
"EntityFramework.SqlServer": "7.0.0-beta2-11758",
"EntityFramework.Commands": "7.0.0-beta2-11758"
},
"frameworks": {
"aspnet50": {
"dependencies": {
}
},
"aspnetcore50": {
"dependencies": {
"System.Runtime": "4.0.20-beta-22231"
}
}
}
}
BloggingContext 配置代码:
using Microsoft.Data.Entity;
using Microsoft.Data.Entity.Metadata;
using System.Collections.Generic;
namespace EF7
{
public class BloggingContext : DbContext
{
public DbSet<Blog> Blogs { get; set; }
public DbSet<BlogCate> BlogCates { get; set; }
protected override void OnConfiguring(DbContextOptions builder)
{
builder.UseSqlServer(@"Server=.;Database=Blogging;Trusted_Connection=True;");
}
protected override void OnModelCreating(ModelBuilder builder)
{
builder.Entity<Blog>()
.Key(b => b.BlogId);
builder.Entity<BlogCate>()
.Key(b => b.CateId);
}
}
public class Blog
{
public int BlogId { get; set; }
public string Url { get; set; }
public int BlogCateId { get; set; }
}
public class BlogCate
{
public int CateId { get; set; }
public string CateName { get; set; }
}
}
测试代码:
[Fact]
public void TestWithContains()
{
using (var context = new BloggingContext())
{
var values = new[] { "a", "b", "c" };
var query = from b in context.Blogs
where values.Contains(b.Url)
select b;
var result = query.ToList();
}
}
EF6 测试结果:
EF6 生成 SQL 代码:
SELECT
[Extent1].[BlogId] AS [BlogId],
[Extent1].[BlogCateId] AS [BlogCateId],
[Extent1].[Url] AS [Url]
FROM [dbo].[Blog] AS [Extent1]
WHERE ([Extent1].[Url] IN (N'a', N'b', N'c')) AND ([Extent1].[Url] IS NOT NULL)
EF7 测试结果:
详细异常信息:
Remotion.Linq.Clauses.ResultOperators.ContainsResultOperator
at Microsoft.Data.Entity.Query.ResultOperatorHandler.HandleResultOperator(EntityQueryModelVisitor entityQueryModelVisitor, ResultOperatorBase resultOperator, QueryModel queryModel)
at Microsoft.Data.Entity.Relational.Query.RelationalResultOperatorHandler.HandlerContext.get_EvalOnClient()
at Microsoft.Data.Entity.Relational.Query.RelationalResultOperatorHandler.HandleResultOperator(EntityQueryModelVisitor entityQueryModelVisitor, ResultOperatorBase resultOperator, QueryModel queryModel)
at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.VisitResultOperator(ResultOperatorBase resultOperator, QueryModel queryModel, Int32 index)
at Remotion.Linq.Clauses.ResultOperatorBase.Accept(IQueryModelVisitor visitor, QueryModel queryModel, Int32 index)
at Remotion.Linq.QueryModelVisitorBase.VisitResultOperators(ObservableCollection1 resultOperators, QueryModel queryModel)
at Remotion.Linq.QueryModelVisitorBase.VisitQueryModel(QueryModel queryModel)
at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.VisitQueryModel(QueryModel queryModel)
at Microsoft.Data.Entity.Query.ExpressionTreeVisitors.DefaultQueryExpressionTreeVisitor.VisitSubQueryExpression(SubQueryExpression subQueryExpression)
at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitExpression(Expression expression)
at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.ReplaceClauseReferences(Expression expression, IQuerySource querySource)
at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.VisitWhereClause(WhereClause whereClause, QueryModel queryModel, Int32 index)
at Microsoft.Data.Entity.Relational.Query.RelationalQueryModelVisitor.VisitWhereClause(WhereClause whereClause, QueryModel queryModel, Int32 index)
at Remotion.Linq.Clauses.WhereClause.Accept(IQueryModelVisitor visitor, QueryModel queryModel, Int32 index)
at Remotion.Linq.QueryModelVisitorBase.VisitBodyClauses(ObservableCollection1 bodyClauses, QueryModel queryModel)
at Remotion.Linq.QueryModelVisitorBase.VisitQueryModel(QueryModel queryModel)
at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.VisitQueryModel(QueryModel queryModel)
at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.CreateQueryExecutor[TResult] (QueryModel queryModel)
at Microsoft.Data.Entity.Relational.RelationalDataStore.Query[TResult] (QueryModel queryModel)
at Microsoft.Data.Entity.Query.EntityQueryExecutor.ExecuteCollection[T](QueryModel queryModel)
at Remotion.Linq.Clauses.StreamedData.StreamedSequenceInfo.ExecuteCollectionQueryModel[T] (QueryModel queryModel, IQueryExecutor executor)
at Remotion.Linq.Clauses.StreamedData.StreamedSequenceInfo.ExecuteQueryModel(QueryModel queryModel, IQueryExecutor executor)
at Remotion.Linq.QueryModel.Execute(IQueryExecutor executor)
at Remotion.Linq.QueryProviderBase.Execute(Expression expression)
at Remotion.Linq.QueryProviderBase.System.Linq.IQueryProvider.Execute[TResult] (Expression expression)
at Remotion.Linq.QueryableBase1.GetEnumerator()
at System.Collections.Generic.List1..ctor(IEnumerable1 collection)
at System.Linq.Enumerable.ToList[TSource] (IEnumerable1 source)
at EF7.Tests.EF7_Test.TestWithContains() in C:UsersyuezhongxinDesktopEF7srcEF7.TestsEF7_Test.cs:line 83
相似问题:Calling ICollection<>.Contains() with a sub query doesn't work
已提交至 EntityFramework 7 issues:Use EF7, Linq Contains In is error.