LINQ2SQL图像保存问题 [英] linq2sql image saving problems

查看:238
本文介绍了LINQ2SQL图像保存问题的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个对象,它有一个属性:

I have an object that has a property:

[Column]
public Binary Image { get; set; }

当对象被保存在第一时间每天这是确定的,但是当它被修改,我得到的SubmitChanges异常:

When the object is saved the first time every this is OK, but when it is modified I get an exception on SubmitChanges:

中的数据类型的图像和   VARBINARY(最大)是不相容的,在   等于操作员

The data types image and varbinary(max) are incompatible in the equal to operator.

可能是什么问题就在这里?

What might be the problem here?

推荐答案

您是否获得了,异常?问题是,LINQ2SQL要检查,以确保它应该修改列之前,它实际上修改它。我通常不关心我和我心甘情愿更新整个行,所以我就把 UpdateCheck的= UpdateCheck.Never 命名的参数在我的 Col​​umnAttributes 。即,

Are you getting the, "" exception? The problem is that linq2sql wants to check to make sure it should modify the column before it actually modifies it. I usually don't care as much and am perfectly happy updating the entire row so I put the UpdateCheck = UpdateCheck.Never named parameter in my ColumnAttributes. I.e.,

[Column(UpdateCheck = UpdateCheck.Never)]

然后,当我想保存的项目,我只是这样做:

Then, when I want to save the item, I just do this:

Table<TEntity> da = MyDataContext.Context.GetTable<TEntity>();

if (entity.Id > 0)
    da.Attach(entity, true);

else
    da.InsertOnSubmit(entity);

da.Context.SubmitChanges();

这篇关于LINQ2SQL图像保存问题的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆