如何刷新WPF DataGrid？ [英] How to refresh a WPF DataGrid?

问题描述

我有一个WPF DataGrid与一些数据。您可以通过单独的窗口添加行。 DataContext是一样的LINQ to SQL对象。绑定也是一样的，我将ItemsSource属性绑定到一个表。

在另一个窗口中，当用户点击保存时，我创建一个行以编程方式使用InsertOnSubmit添加。之后，我使用DataContext的SubmitChanges方法。

我的问题是DataGrid没有更新。如果我重新启动应用程序，我可以看到新行，所以它在数据库中，但我找不到一种刷新DataGrid的方法。

到目前为止， ve试图在DataGrid的BindingExpression上使用UpdateTarget，但没有帮助。我也试过dataGrid.Items.Refresh（） - 相同的结果。如何解决这个问题？

解决方案

不更新的原因是LINQ to SQL不实现INotifyCollectionChanged WPF无法确定ItemsSource已被更新。解决这个问题的最不可怕的方法是将LINQ-to-SQL结果复制到ObservableCollection - 当您执行插入操作时，也添加到observable集合。然后你会看到更新。

I have a WPF DataGrid with some data. You can add rows through a separate window. The DataContext is the same, a LINQ-to-SQL object. Binding is also the same, I bind the "ItemsSource" property to a table.

In the other window, when the user clicks on "Save", I create a row programatically and add it using "InsertOnSubmit". After that I use the DataContext's "SubmitChanges" method.

My problem is that the DataGrid isn't updated. If I restart the application I can see the new row, so it's in the database, but I couldn't find a way to refresh the DataGrid.

So far I've tried to use "UpdateTarget" on the BindingExpression of the DataGrid, but it didn't help. I've also tried "dataGrid.Items.Refresh()" — same result. How can I fix this?

解决方案

The reason it's not updating is that LINQ-to-SQL doesn't implement INotifyCollectionChanged, so WPF has no way to tell that the ItemsSource has been updated. The least terrifying way to fix this, is to copy your LINQ-to-SQL results to an ObservableCollection - when you do the Insert, also add to the observable collection. Then you'll see the update.

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