Question

我有一个使用MySql Connector .NET v6.8.3的linq查询，如下所示：

var query = from c in context.Containers
                            where c.isActive && !c.isDeleted
                            join pc in context.PublishedContainers on c.id_container equals pc.id_container
                            where pc.id_website == _siteId && pc.is_active && pc.is_visible && pc.is_revised == 9 //9 = revised
                            where pc.PublishedContainerProviders.Any()
                            where pc.PublishedContainerPresentations.Any(pcp => pcp.Presentation.PresentationServiceInfoes.SelectMany(psi => psi.PresentationServiceInfoLocations.Where(l => !string.IsNullOrEmpty(l.Location.googlemap))).Any())
                            select c;

当我致电query.Count()时，我的The method or operation is not implemented异常，我不知道为什么......

发生了什么事？

修改：如果我调用ToList()方法，我有相同的例外。

编辑2 ：例外：

`An error occurred while preparing the command definition. See the inner exception for details.`

堆栈跟踪：

at System.Data.EntityClient.EntityCommandDefinition..ctor(DbProviderFactory storeProviderFactory, DbCommandTree commandTree)
   at System.Data.EntityClient.EntityProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree)
   at System.Data.Objects.Internal.ObjectQueryExecutionPlan.Prepare(ObjectContext context, DbQueryCommandTree tree, Type elementType, MergeOption mergeOption, Span span, ReadOnlyCollection`1 compiledQueryParameters, AliasGenerator aliasGenerator)
   at System.Data.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption)
   at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
   at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
   at System.Linq.Queryable.Count[TSource](IQueryable`1 source)

内部异常：The method or operation is not implemented. 堆栈跟踪：

   at MySql.Data.Entity.SelectStatement.Accept(SqlFragmentVisitor visitor)
   at MySql.Data.Entity.ExistsFragment.Accept(SqlFragmentVisitor visitor)
   at MySql.Data.Entity.BinaryFragment.Accept(SqlFragmentVisitor visitor)
   at MySql.Data.Entity.SqlGenerator.FuseSelectWithInnerSelect(SelectStatement outer, SelectStatement inner)
   at MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type)
   at MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type)
   at MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression)
   at MySql.Data.Entity.SqlGenerator.Visit(DbIsEmptyExpression expression)
   at MySql.Data.Entity.SqlGenerator.Visit(DbNotExpression expression)
   at MySql.Data.Entity.SqlGenerator.VisitBinaryExpression(DbExpression left, DbExpression right, String op)
   at MySql.Data.Entity.SelectGenerator.Visit(DbFilterExpression expression)
   at MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type)
   at MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type)
   at MySql.Data.Entity.SelectGenerator.Visit(DbGroupByExpression expression)
   at MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type)
   at MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type)
   at MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression)
   at MySql.Data.Entity.SelectGenerator.GenerateSQL(DbCommandTree tree)
   at MySql.Data.MySqlClient.MySqlProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree)
   at System.Data.EntityClient.EntityCommandDefinition..ctor(DbProviderFactory storeProviderFactory, DbCommandTree commandTree)

编辑3：我只是发现问题就在这一行：

where pc.PublishedContainerPresentations.Any(pcp => pcp.Presentation.PresentationServiceInfoes.SelectMany(psi => psi.PresentationServiceInfoLocations.Where(l => !string.IsNullOrEmpty(l.Location.googlemap))).Any())

在IQueryable中调用Count时，没有实现方法或操作

0 个答案: