事实证明这有点难以追查,但是当使用 Effort 测试 Entity Framework 6 时,我似乎在尝试访问其中一个 DBSet 时遇到 KeyNotFoundException(“字典中不存在给定的键”)错误存储库。
我注意到它适用于 DbContext 中的一个或两个 DbSet,但是一旦我开始向 DbContext 添加多个 DbSet,我就会收到上述错误。
示例代码(这是我的整个代码的简化,当我从 DbContext 中注释掉一些 DbSet 然后将它们放回时,错误似乎是随机的。我在模型上也有部分类,但它有时也会成功,所以看起来诡异的):
测试
[Fact]
public void MyTest()
{
var connection = Effort.DbConnectionFactory.CreateTransient();
var context = new StubDbContext(connection);
var count = context.Models1.Count();
Assert.Equal(count, 0);
}
DBContext 和 DbSets 模型
public class StubEntityModelA
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
}
public class StubEntityModelB
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
}
public class StubEntityModelC
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
}
public class StubDbContext : DbContext
{
public StubDbContext(DbConnection connection): base(connection, true)
{
}
public virtual DbSet<StubEntityModelA> Models1 { get; set; }
public virtual DbSet<StubEntityModelB> Models2 { get; set; }
public virtual DbSet<StubEntityModelC> Models3 { get; set; }
}
堆栈跟踪:
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at Effort.Provider.EffortProviderManifest.GetStoreType(TypeUsage edmType)
at System.Data.Entity.ModelConfiguration.Edm.Services.StructuralTypeMappingGenerator.MapTableColumn(EdmProperty property, String columnName, Boolean isInstancePropertyOnDerivedType)
at System.Data.Entity.ModelConfiguration.Edm.Services.PropertyMappingGenerator.Generate(EntityType entityType, IEnumerable`1 properties, EntitySetMapping entitySetMapping, MappingFragment entityTypeMappingFragment, IList`1 propertyPath, Boolean createNewColumn)
at System.Data.Entity.ModelConfiguration.Edm.Services.TableMappingGenerator.Generate(EntityType entityType, DbDatabaseMapping databaseMapping)
at System.Data.Entity.ModelConfiguration.Edm.Services.DatabaseMappingGenerator.GenerateEntityTypes(DbDatabaseMapping databaseMapping)
at System.Data.Entity.ModelConfiguration.Edm.Services.DatabaseMappingGenerator.Generate(EdmModel conceptualModel)
at System.Data.Entity.DbModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo)
at System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection)
at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)
at System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input)
at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()
at System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider()
at System.Linq.Queryable.Count[TSource](IQueryable`1 source)
at XXXX.Business.Test.XXXXTests.IXXXXXXMethod.ShouldInsertRecordWhenNoneAlreadyExist() in C:\Workspaces\XXX\XXXXX\XXXXX.Business.Test\XXXXXXTests.cs:line 125