我试图从数据表动态生成数据网格,同时显示两个用于“编辑”和“删除”功能的按钮列。我可以在 XAML 中手动创建按钮列,并且可以从 DataTable 动态生成列,但我似乎无法同时执行这两项操作。如果我只是在代码隐藏中对此进行编码,我认为解决问题会简单得多,因为我可以直接访问控件。但是,我正在使用 MVVM 构建此视图,但我想不出一种方法来动态操作视图到这种详细程度。
这是我的一些代码(请注意,对于比我有更多 WPF/MVVM 经验的人来说,可能会有一些“复制/粘贴失败”是显而易见的): XAML:
<DataGrid x:Name="grdMapValues"
AutoGenerateColumns="True"
ItemsSource="{Binding GridSourceDataTable}">
<DataGrid.Columns>
<DataGridTemplateColumn IsReadOnly="True">
<DataGridTemplateColumn.HeaderTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Button HorizontalAlignment="Left"
Command="{Binding Path=DataContext.Commands.AddMapValue,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}"
Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}">
<Image Width="14" Height="14" Source="/Controls;component/Resources/Images/new.gif" ToolTip="New" />
</Button>
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.HeaderTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Button Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}"
Command="{Binding Path=DataContext.Commands.EditMapValue,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}">
<Image Width="14" Height="14" Source="/Controls;component/Resources/Images/edit.gif" />
</Button>
<Button Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}"
Command="{Binding Path=DataContext.Commands.DeleteMapValue,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}">
<Image Width="14" Height="14" Source="/Controls;component/Resources/Images/delete.gif" />
</Button>
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
视图模型:
private DataTable _gridSource;
public DataTable GridSourceDataTable
{
get
{
return _gridSource;
}
set
{
_gridSource = value;
OnPropertyChanged("GridSourceDataTable");
}
}
private void GenerateDataTable()
{
switch (caseInt)
{
case 1:
if (_isDate)
{
_gridSource.Columns.Add("Date", typeof(DateTime));
}
else
{
_gridSource.Columns.Add("Number", typeof(string));
}
_gridSource.Columns.Add("Value", typeof(decimal));
_gridSource.Columns.Add("SourceString", typeof(string));
GridIsVisible = true;
break;
//Other similar case blocks removed
default:
GridIsVisible = false;
break;
}
OnPropertyChanged("GridSourceDataTable");
}
所以我猜测解决方案(如果有的话)将涉及 XAML 和 DataTable 属性的某种混合,或者它将涉及比我的简单 DataTable 更复杂的对象或属性。
我已经为此工作了几个小时,因此我们将非常感谢您提供的任何帮助。
这是我尝试过的附加行为:
public class DataGridColumnBehavior : Behavior<DataGrid>
{
public AdditionalColumnsList AdditionalColumns { get; set; }
protected override void OnAttached()
{
base.OnAttached();
AddAdditionalColumns();
}
void AddAdditionalColumns()
{
if(AdditionalColumns == null || AdditionalColumns.Count == 0) return;
foreach (var additionalColumn in AdditionalColumns)
{
AssociatedObject.Columns.Add(new DataGridTemplateColumn
{
HeaderTemplate = additionalColumn.HeaderTemplate,
CellTemplate = additionalColumn.CellTemplate
});
}
}
}
我使用了几个简单的类来表示附加列和附加列列表。
public class AdditionalColumn
{
public DataTemplate HeaderTemplate { get; set; }
public DataTemplate CellTemplate { get; set; }
}
public class AdditionalColumnsList : List<AdditionalColumn>
{
}
并且,这就是将行为附加到 DataGrid 的方式:
<DataGrid Margin="5" ItemsSource="{Binding GridSource}">
<i:Interaction.Behaviors>
<local:DataGridColumnBehavior>
<local:DataGridColumnBehavior.AdditionalColumns>
<local:AdditionalColumnsList>
<local:AdditionalColumn>
<local:AdditionalColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Button Header" />
</DataTemplate>
</local:AdditionalColumn.HeaderTemplate>
<local:AdditionalColumn.CellTemplate>
<DataTemplate>
<Button Content="Button" Command="{Binding ButtonCommand}" />
</DataTemplate>
</local:AdditionalColumn.CellTemplate>
</local:AdditionalColumn>
</local:AdditionalColumnsList>
</local:DataGridColumnBehavior.AdditionalColumns>
</local:DataGridColumnBehavior>
</i:Interaction.Behaviors>
</DataGrid>
生成的网格:
阅读此 CodeProject
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