我使用EF5,并且不知道为什么一个实体在将该实体的唯一更改的PropertyValue设置回原始值之后具有“修改”状态.
using (TestDbContext context = new TestDbContext())
{
string name = context.Person.First().Name;
// count is 0
int count = context.ChangeTracker.Entries().Count(e => e.State == EntityState.Modified);
// Change Value
context.Person.First().Name = "Test";
// count is 1
count = context.ChangeTracker.Entries().Count(e => e.State == EntityState.Modified);
// Revert Value
context.Person.First().Name = name;
context.ChangeTracker.DetectChanges();
// count is 1
count = context.ChangeTracker.Entries().Count(e => e.State == EntityState.Modified);
}
为什么？
