WPF DataGridRow.IsNewItem即使在DataGridRow.Item不是NOT CollectionView.NewItemPlaceholder之后也保持为True

问题描述

跟踪DataGridRow.Item和DataGridRow.IsNewItem属性后，我发现:每个添加的项(当Source为ObservableCollection<MyClass>时添加到DataGrid)，IsNewItem总是积极的，尽管Item尽管他不是NewItemPlaceholder.

After tracking the DataGridRow.Item and DataGridRow.IsNewItem properties, I discover that: each added item (to DataGrid when Source is ObservableCollection<MyClass>), IsNewItem Always positive, Although Item Although he is not a NewItemPlaceholder.

此后，我查看了 MSDN ，发现它确实受到两个因素的影响:

Afterwards I looked at MSDN and saw that it was indeed affected by two factors:

如何提交添加的项目?

推荐答案

您可以完全在XAML中与NewItemPlaceholder进行比较:

You can do the comparison against NewItemPlaceholder purely in XAML:

<DataTemplate.Triggers>
    <DataTrigger Binding="{Binding Item, RelativeSource={RelativeSource FindAncestor, AncestorType=DataGridRow}}"
                 Value="{x:Static CollectionView.NewItemPlaceholder}">
        <Setter TargetName="Text" Property="Visibility" Value="Hidden" />
    </DataTrigger>
</DataTemplate.Triggers>

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