关于EntityFramework4.x/5.0只更新某部分字段的问题

因为4.x/5.0的context都采用了继承DbContext,但DbContext不提供修改字段状态的相关操作方法,可是实现了IObjectContextAdapter接口,我们可以从这里拿到ObjectContext,这样一切都好办了.我们可以如下操作

public int Update(E entity, string[] propertys)

        {

            int changeCount = 0;

            using(TransactionScope transaction = new TransactionScope (TransactionScopeOption.Required))

            {

                using (YzOASysEntities context = new YzOASysEntities())

                {

                    context.Set<E>().Attach(entity);

                    

                    IObjectContextAdapter objectContextAdatper = context;

                    ObjectContext objectContext = objectContextAdatper.ObjectContext;

                    ObjectStateEntry ose = objectContext.ObjectStateManager.GetObjectStateEntry(entity);

                    foreach (string property in propertys)

                    {

                        ose.SetModifiedProperty(property);

                    }



                    if (context.Entry<E>(entity).State == EntityState.Unchanged)

                        context.Entry<E>(entity).State = EntityState.Modified;

                    changeCount = context.SaveChanges();

                    if (changeCount > 0)

                        transaction.Complete();

                }

            }

            return changeCount;

            

        }

其实设不设置State是Modified都没问题.因为上面已经把状态给同步了.