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

问题描述

我有一个带有一些数据的 WPF DataGrid.您可以通过单独的窗口添加行.DataContext 是相同的，一个 LINQ-to-SQL 对象.绑定也是一样，我把ItemsSource 属性绑定到一个表上.

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.

在另一个窗口中，当用户单击Save 时，我以编程方式创建一行并使用InsertOnSubmit 添加它.之后我使用 DataContext 的 SubmitChanges 方法.

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

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，但我找不到刷新DataGrid 的方法.

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.

到目前为止，我已经尝试在 DataGrid 的 BindingExpression 上使用 UpdateTarget，但它没有帮助.我也试过 dataGrid.Items.Refresh() —— 结果一样.我该如何解决这个问题?

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?

推荐答案

它没有更新的原因是 LINQ-to-SQL 没有实现 INotifyCollectionChanged，所以WPF 无法判断 ItemsSource 已更新.解决此问题的最不可怕的方法是将您的 LINQ-to-SQL 结果复制到 ObservableCollection - 当您执行 Insert 时，还要添加到 observable 集合.然后你会看到更新.

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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