嗨,我有一个 wpf 项目,它将数据网格绑定到模块,如下所示:
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Name}" IsReadOnly="True"/>
<DataGridTemplateColumn Header="Values">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding Values}" SelectedItem="{Binding Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
这工作正常。现在我想添加一些功能,包括设置组合框SelectionChanged
的事件。所以我像这样更改了xaml
文件:
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Name}" IsReadOnly="True"/>
<DataGridTemplateColumn Header="Values">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding Values}" SelectedItem="{Binding Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
/!-- Add an EventSetter here. -->
<Style TargetType="{x:Type ComboBox}">
<EventSetter Event="SelectionChanged" Handler="ValueChanged" />
</Style>
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
并在后端添加一个函数,如下所示:
private void ValueChanged(object sender, SelectionChangedEventArgs e)
{
var comboBox = sender as ComboBox;
if (comboBox.SelectedItem != null)
{
//do something here.
}
}
但是当我更改组合框单元格时,这使得项目error: "The Application is in break mode."
崩溃。那么问题可能出在哪里呢?提前感谢!
像我一样愚蠢。只需在combobox
内设置事件即可解决问题。
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Name}" IsReadOnly="True"/>
<DataGridTemplateColumn Header="Values">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding Values}" SelectedItem="{Binding Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectionChanged="ValueChanged" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
您需要将ComboBox
的Style
属性设置为您的Style
:
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding Values}" SelectedItem="{Binding Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
<ComboBox.Style>
<Style TargetType="{x:Type ComboBox}">
<EventSetter Event="SelectionChanged" Handler="ValueChanged" />
</Style>
</ComboBox.Style>
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
或者你可以直接在ComboBox
元素上挂接事件处理程序并摆脱Style
:
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding Values}" SelectedItem="{Binding Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectionChanged="ValueChanged" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>