4
如果對記錄進行了重大更改,我已經擴展了一個類以便將最後修改的時間戳添加到記錄。這是用類似於this的代碼完成的。實體框架6 SaveChanges()重寫不一致地檢測更改
這是我的問題。 SaveChanges()
正在觸發這兩個更改,但第二個沒有進入循環:沒有對象被檢測爲需要更改。
但是,記錄確實通過base.SaveChanges()調用獲取由EF更新。
這裏的擴展MasterTable:
namespace AuditTestEF
{
public interface IHasAuditing
{
DateTime LastModifiedOn { get; set; }
int LastModifiedBy { get; set; }
}
public partial class MasterTable : IHasAuditing
{
}
public class AuditTestEntitiesWithAuditing : AuditTestEntities
{
public int TestingUserIs = 1;
public override int SaveChanges()
{
foreach (ObjectStateEntry entry in (this as IObjectContextAdapter)
.ObjectContext
.ObjectStateManager
.GetObjectStateEntries(EntityState.Added | EntityState.Modified))
{
// This loop is entered the first time, but not the second
if (entry.IsRelationship) continue;
var lastModified = entry.Entity as IHasAuditing;
if (lastModified == null) continue;
lastModified.LastModifiedOn = DateTime.UtcNow;
lastModified.LastModifiedBy = TestingUserIs;
}
return base.SaveChanges();
}
}
}
而這裏的測試工具:
[TestMethod]
public void TestMethod1()
{
MasterTable mtOriginal;
using (var audit = new AuditTestEntitiesWithAuditing())
{
var message = "Hello";
audit.TestingUserIs = 1;
mtOriginal = new MasterTable {TextField = message};
audit.MasterTable.Add(mtOriginal);
audit.SaveChanges();
// This test passes, TestingUser is set in the override
Assert.IsTrue(mtOriginal.LastModifiedBy == audit.TestingUserIs);
}
using (var audit = new AuditTestEntitiesWithAuditing())
{
var mt = audit.MasterTable.Find(mtOriginal.MasterTableId);
mt.TextField = "Goodbye";
audit.TestingUserIs = 4;
audit.SaveChanges();
// This test fails, the record is written with "Goodbye" but
// GetObjectStateEntries(EntityState.Added | EntityState.Modified) has no entries.
Assert.IsTrue(mt.LastModifiedBy == audit.TestingUserIs);
}
}
沒有其他的代碼。關於實體追蹤或任何事情都沒有奇怪的結果。所見即所得。
我錯過了什麼?如何通過檢查Modified來清除修改的對象?