为什么 Invalidate() 应该在控件外部调用才可以工作？

发布于 2024-09-11 08:00:17 字数 618 浏览 17 评论 0原文

我正在使用C# + winforms来开发软件。
我有一个包含多个DataGridView的UserControl，

datagridview1.datasource = from p in dc.doctor select p;

我使用linq to sql用dataSource填充dataGridView，因为我需要刷新数据源来更新记录，所以我创建一个新的dataContext并再次分配数据源。

datagridview1.datasource = from p in dc.doctor select p;

起初我发现，虽然我重置了数据源，但datagridview仍然无法刷新，有人告诉我应该调用datagridview上的invalidate函数，我尝试了一下。在某种程度上，它是有效的。但是如果我在 UserControl 的类中调用 Invalidate，它将不起作用。
如果我在 UserControl 的类上创建一个公共函数，然后使用 userControl.refreshRecord() 调用它，那么它就可以工作。

有人能指出我错过了什么吗？当有人调用invalidate时，什么时候才能真正起作用？
提前致谢！

原文

I am using C# + winforms to develop software.
I have a UserControl which contains several DataGridView

datagridview1.datasource = from p in dc.doctor select p;

I use linq to sql to populate the dataGridView with dataSource, because I need to refresh the datasource to update the records, so I create a new dataContext and assign the datasource again.

datagridview1.datasource = from p in dc.doctor select p;

At first I found, although I reset the datasource, the datagridview still can not get refreshed, someone tell me that I should call the invalidate function on datagridview, I tried. To a certain extent, it works.
But If I called the Invalidate inside the UserControl's class, it won't work.
If I create a public function on the UserControl's class, then call it with userControl.refreshRecord(), Then it works.

Can someone point me what am I missed ? When someone call invalidate, when will it really work?
Thanks in advance !

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