为什么在更改 ItemsSource 时 DataGrid 不更新? [英] Why does the DataGrid not update when the ItemsSource is changed?

问题描述

我的 wpf 应用程序中有一个数据网格，但有一个简单的问题.我有一个通用列表，每次将对象添加到集合时，我都想将此集合绑定到我的数据网格数据源.而且我对使用 observable 集合不感兴趣.

I have a datagrid in my wpf application and I have a simple problem. I have a generic list and I want to bind this collection to my datagrid data source every time an object is being added to the collection. and I'm not interested to use observable collection.

关键是我在其他地方使用了相同的方法并且效果很好.但是这次当我按下添加按钮时，一个对象被添加并且数据网格正确更新，但是从第二个项目添加到集合数据网格不再更新.

the point is I'm using the same method somewhere else and that works fine. but this time when i press Add button an object is added and datagrid updates correctly but from the second item added to collection datagrid does not update anymore.

这是代码:

 private void btnAddItem_Click(object sender, RoutedEventArgs e)
    {
        OrderDetailObjects.Add(new OrderDetailObject
        {
            Price = currentitem.Price.Value,
            Quantity = int.Parse(txtQuantity.Text),
            Title = currentitem.DisplayName,
            TotalPrice = currentitem.Price.Value * int.Parse(txtQuantity.Text)
        });

        dgOrderDetail.ItemsSource = OrderDetailObjects;
        dgOrderDetail.UpdateLayout();
    }

有什么想法吗?

推荐答案

ItemsSource 始终相同，引用您的集合，没有变化，没有更新.你之前可以把它清零:

The ItemsSource is always the same, a reference to your collection, no change, no update. You could null it out before:

dgOrderDetail.ItemsSource = null;
dgOrderDetail.ItemsSource = OrderDetailObjects;

或者，您也可以只刷新项目:

Alternatively you could also just refresh the Items:

dgOrderDetail.ItemsSource = OrderDetailObjects; //Preferably do this somewhere else, not in the add method.
dgOrderDetail.Items.Refresh();

我不认为你真的想在那里调用 UpdateLayout...

I do not think you actually want to call UpdateLayout there...

(拒绝使用 ObservableCollection 并不是一个好主意)

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