相关疑难解决方法(0)

我使用EF5,并且在我将此实体的唯一更改的PropertyValue设置回原始值之后,不知道为什么实体具有"已修改"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？:(