c# - 获取嵌套集合包含另一个集合中的项目的项目

Question

我正在尝试从另一个集合中获取包含项目或多个项目的嵌套集合的项目。如果我首先枚举集合，然后执行内存中 .Where() 过滤器，我会得到预期的集合。

var filterTagIds = new[] { 1, 2, 3 };

var works = base.DbSet
    .Include(p => p.Company)
        .ThenInclude(p => p.CompanyTags)
    .ToList()
    .Where(p => p.Company.CompanyTags.Any(q => filterTagIds.Contains(q.TagId)))
    .ToList();

但是，如果我尝试在没有枚举的情况下执行此操作(我想在数据库级别执行此操作)，则会出现异常。

var doesNotWork = base.DbSet
    .Include(p => p.Company)
        .ThenInclude(p => p.CompanyTag)
    .Where(p => p.Company.CompanyTags.Any(q => filterTagIds.Contains(q.TagId)))
    .ToList();

这是我遇到的异常:

{"variable 't0' of type 'Microsoft.Data.Entity.Query.EntityQueryModelVisitor+TransparentIdentifier`2[Microsoft.Data.Entity.Storage.ValueBuffer,Microsoft.Data.Entity.Storage.ValueBuffer]' referenced from scope '', but it is not defined"}
    Data: {System.Collections.ListDictionaryInternal}
    HResult: -2146233079
    HelpLink: null
    InnerException: null
    Message: "variable 't0' of type 'Microsoft.Data.Entity.Query.EntityQueryModelVisitor+TransparentIdentifier`2[Microsoft.Data.Entity.Storage.ValueBuffer,Microsoft.Data.Entity.Storage.ValueBuffer]' referenced from scope '', but it is not defined"
    Source: "System.Core"
    StackTrace: "   at System.Linq.Expressions.Compiler.VariableBinder.Reference(ParameterExpression node, VariableStorageKind storage)\r\n   at System.Linq.Expressions.Compiler.VariableBinder.VisitParameter(ParameterExpression node)\r\n   at System.Linq.Expressions.ParameterExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitMember(MemberExpression node)\r\n   at System.Linq.Expressions.MemberExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)\r\n   at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.Compiler.VariableBinder.VisitUnary(UnaryExpression node)\r\n   at System.Linq.Expressions.UnaryEx
pression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1 nodes)\r\n   at System.Linq.Expressions.Compiler.VariableBinder.VisitLambda[T](Expression`1 node)\r\n   at System.Linq.Expressions.Expression`1.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)\r\n   at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)\r\n   at System.Linq.Expressions.MethodCallExp
ression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)\r\n   at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)\r\n   at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1 nodes)\r\n   at System.Linq.Expressions.Compiler.VariableBinder.VisitLambda[T](Expression`1 node)\r\n   at System.Linq.Expressions.Expres
sion`1.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)\r\n   at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)\r\n   at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitArguments(IArgumentProvider nodes)\r\n   at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node)\r\n   at System.Linq.Expression
s.MethodCallExpression.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1 nodes)\r\n   at System.Linq.Expressions.Compiler.VariableBinder.VisitLambda[T](Expression`1 node)\r\n   at System.Linq.Expressions.Expression`1.Accept(ExpressionVisitor visitor)\r\n   at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)\r\n   at System.Linq.Expressions.Compiler.VariableBinder.Bind(LambdaExpression lambda)\r\n   at System.Linq.Expressions.Compiler.LambdaCompiler.Compile(LambdaExpression lambda, DebugInfoGenerator debugInfoGenerator)\r\n   at System.Linq.Expressions.Expression`1.Compile()\r\n   at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.CreateExecutorLambda[TResults]()\r\n   at Microsoft.Data.Entity.Query.EntityQueryModelVisitor.CreateQueryExecutor[TResult](QueryModel queryModel)\r\n   at Microsoft.Data.Entity.Storage.Database.CompileQuery[TResult](QueryModel quer
yModel)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.Data.Entity.Query.Internal.QueryCompiler.<>c__DisplayClass18_0`1.<CompileQuery>b__0()\r\n   at Microsoft.Data.Entity.Query.Internal.CompiledQueryCache.GetOrAddQuery[TResult](Object cacheKey, Func`1 compiler)\r\n   at Microsoft.Data.Entity.Query.Internal.QueryCompiler.CompileQuery[TResult](Expression query)\r\n   at Microsoft.Data.Entity.Query.Internal.QueryCompiler.Execute[TResult](Expression query)\r\n   at Microsoft.Data.Entity.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)\r\n   at Remotion.Linq.QueryableBase`1.GetEnumerator()\r\n   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)\r\n   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)\r\n   at MyProject.DAL.Repository.LocationRepository.GetCompanyLocations(CompanyMarkersFilter filter) in D:\\projects\\MyProject\\src\\Komp
anio.DAL\\Repository\\LocationRepository.cs:line 24"
    TargetSite: {Void Reference(System.Linq.Expressions.ParameterExpression, System.Linq.Expressions.Compiler.VariableStorageKind)}

我正在寻找的东西在 EF 中可行吗？也许这只是 EF-Core 的问题？或者我做错了什么？谢谢。

Answer 1

https://github.com/aspnet/EntityFramework/issues/4596

已知问题，将在 EF 发行版中修复。