我正在使用Effort,EF測試庫來創建我的數據庫的內存實例,並遇到這個有趣的場景:
DbContext1
Table
(不保存) DbContext1
DbContext2
Table
項目 Effort.Exceptions.EffortException : Database has not been initialized.
但是,如果我也在DbContext1
執行計數(步驟5),那麼DbContext2
中的Count不會失敗?
完整代碼 :
public void TestEF()
{
var factory = new InMemoryMyApplicationDbContextFactory();
using (var db = factory.CreateDbContext())
{
//uncomment this line to prevent exception - why????
//db.Orders.Count();
db.Orders.Add(new Order{ Id = Guid.NewGuid() });
// intentionally do not call db.SaveChanges()
}
using (var db = factory.CreateDbContext())
{
// throws an exception if no read was performed above
db.Orders.Count();
}
}
完全例外:
Effort.Exceptions.EffortException : Database has not been initialized.
If using CodeFirst try to add the following line:
context.Database.CreateIfNotExists()
at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
at System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlan.Execute[TResultType](ObjectContext context, ObjectParameterCollection parameterValues)
at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
at System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass7.<GetResults>b__5()
at System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
at System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0()
at System.Data.Entity.Internal.LazyEnumerator`1.MoveNext()
at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)