在 AddNew 或 EditItem 事务 mvvm 期间不允许 WPF DataGrid 'Refresh'
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WPF DataGrid 'Refresh' is not allowed during an AddNew or EditItem transaction mvvm
提问by twaldron
I have the following grid
我有以下网格
<DataGrid
x:Name="TablesDataGrid"
Grid.Column="0"
Grid.Row="1"
ItemsSource="{Binding FilteredModels.View}"
AlternationCount="2"
AutoGenerateColumns="False"
CanUserSortColumns="True"
CanUserReorderColumns="False"
CanUserDeleteRows="False"
CanUserAddRows="False"
SelectionMode="Extended"
IsReadOnly="False"
SelectionUnit="FullRow"
RowHeight="25"
HorizontalAlignment="Stretch"
ColumnWidth="Auto">
<DataGrid.Columns >
<DataGridCheckBoxColumn Width="*" Binding="{Binding IsChecked, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" IsReadOnly="False">
<DataGridCheckBoxColumn.HeaderTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}, Path=DataContext.CheckAll}"/>
</DataTemplate>
</DataGridCheckBoxColumn.HeaderTemplate>
</DataGridCheckBoxColumn>
<DataGridTextColumn Header="Source Table" Binding="{Binding SourceTableFullName}" Width="4*"></DataGridTextColumn>
<DataGridTextColumn Header="EDW Schema" Binding="{Binding SchemaName}" Width="2*"></DataGridTextColumn>
<DataGridTextColumn Header="EDW Table" Binding="{Binding TableName}" Width="4*"></DataGridTextColumn>
<DataGridTextColumn Header="Status" Binding="{Binding Status}" Width="*"></DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
and then i have a seachCommand with performs the search on the collectionViewSource FilteredModels in the viewmodel and then calls
然后我有一个 seachCommand 对视图模型中的 collectionViewSource FilteredModels 执行搜索，然后调用
this.FilteredModels.View.Refresh();
when a user checks a few of the checkboxes and sends the grid into editmode and then performs a search we get the following error
当用户选中几个复选框并将网格发送到编辑模式然后执行搜索时，我们会收到以下错误
WPF DataGrid 'Refresh' is not allowed during an AddNew or EditItem transaction
is there a way to force the grid out of edit mode when a check box is checked or maybe even when the seach button is clicked or some other fix for this?
有没有办法在选中复选框时强制网格退出编辑模式，或者甚至在单击搜索按钮或其他一些修复方法时？
thanks!
谢谢！
回答by Saad Abdullah
I know its too late to answer...but for someone who is looking for answer
我知道现在回答已经太晚了……但对于正在寻找答案的人
use cancelEdit or commitEdit method two times in a sequence like this
在这样的序列中使用 cancelEdit 或 commitEdit 方法两次
//for commit
//提交
this.datagrid_layers.CommitEdit();
this.datagrid_layers.CommitEdit();
//for cancel
//取消
this.datagrid_layers.CancelEdit();
this.datagrid_layers.CancelEdit();
回答by jfin3204
you should be able to cast the selected item to IEditableObject and call EndEdit on it, or call the grids CancelEdit method.
您应该能够将所选项目转换为 IEditableObject 并在其上调用 EndEdit，或调用网格 CancelEdit 方法。
回答by wondra
There is a clean MVVM solution to the problem. First off, your ViewModels must implement IEditableObjectinterface (no-op should be enough). That, however, is not enough since the DataGridwill not listen to IEditableObject.CancelEdit.
Another problem is, that neither ICollectionViewnor IEditableCollectionViewimplement the other one. While only ICollectionViewcan refresh, only IEditableCollectionViewcan commit/cancel. Luckily collection view returned by CollectionViewSource.GetDefaultViewimplements both:
这个问题有一个干净的 MVVM 解决方案。首先，您的 ViewModel 必须实现IEditableObject接口（无操作就足够了）。然而，这还不够，因为他们DataGrid不会听IEditableObject.CancelEdit。
另一个问题是，ICollectionView和IEditableCollectionView都没有实现另一个。虽然只能ICollectionView刷新，只能IEditableCollectionView提交/取消。幸运的是，由CollectionViewSource.GetDefaultView实现两个返回的集合视图：
// ViewModel.cs
public class ItemVM : IEditableObject, INotifyPropertyChanged { }
public class ModuleVM : INotifyPropertyChanged {
ICollectionView Items { get; }
public ModuleVM(ObservableCollection<ItemVM> items) {
Items = CollectionViewSource.GetDefaultView(items);
}
public void RefreshSafely() {
((IEditableCollectionView)Items).CancelEdit(); // alterantively, CommitEdit()
Items.Refresh();
}
}
Or in other words, you can cast ICollectionViewto IEditableCollectionViewand call CancelEdit()first.
或者换句话说，您可以首先投射ICollectionView到IEditableCollectionView并调用CancelEdit()。
