加载后如何更新DataGrid？

Question

The above shows my DataGrid.dataGrid_Loaded() method creating a couple of "records" and adding them to a list that my DataGrid uses a its "ItemsSource"

On line 156 I have another record commented out (which is after the grid.ItemsSource was set). If I add that line back in, my code breaks. There must be a way to update my DataGrid with new data, but how?

Thank you for your help!

When I uncomment line 156, I get:

An unhandled exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll

Additional information: An ItemsControl is inconsistent with its items source.

See the inner exception for more information.

Answer 1

You need to clear ItemsSource before changing it:

List<string> items = new List<string>() { "a", "b" };
dataGrid.ItemsSource = items;

// some code

dataGrid.ItemsSource = null;
items.Add("c");
dataGrid.ItemsSource = items;

// dataGrid contains: "a", "b", "c"

You may want to use ObservableCollection<T> and use binding in your XAML - items will update automatically.