Question

我尝试使用相同的数据更新两次，但它会抛出异常

    public void UpdateOnSubmit<T>(T data) where T : class
    {
        lock (_lockObj)
        {
            using (DataModel dx = new DataModel(this._adapter.ConnectionString))
            {
                dx.GetTable<T>().Attach(data);
                dx.Refresh(RefreshMode.KeepCurrentValues, data);
                dx.SubmitChanges();
            }
        }
    }

例外是

An attempt has been made to Attach or Add an entity that is not new, perhaps having been loaded from another DataContext. This is not supported.

首次更新是成功，但不是第二次更新。提前致谢

此致

布赖恩

Answer 1

好像我再次找到了解决方案。我只是将DeferredLoadingEnabled设置为false，它就像一个魅力。

    public void UpdateOnSubmit<T>(T data) where T : class
    {
        lock (_lockObj)
        {
            using (DataModel dx = new DataModel(this._adapter.ConnectionString))
            {
                dx.DeferredLoadingEnabled = false;
                dx.GetTable<T>().Attach(data);
                dx.Refresh(RefreshMode.KeepCurrentValues, data);
                dx.SubmitChanges();
            }
        }
    }

LinqToSQL无法更新两次

1 个答案: