我需要显示一些我的WPF Datagrid的行为只读或不依赖于我的绑定模型的属性。
如何才能做到这一点?
我有同样的问题。使用jsmith的答案,对佰斯宾塞的博客提供的信息,我想出了不需要改变WPF DataGrid的源代码,继承或添加代码来查看的代码隐藏的解决方案。正如你所看到的,我的解决方案是非常MVVM友好。
它采用Expression Blend Attached Behavior mechanism所以你需要安装的Expression Blend SDK,并添加引用Microsoft.Expression.Interactions.dll,但这种行为可以很容易地转换,如果你不喜欢,要native attached behavior。
<DataGrid
xmlns:Behaviors="clr-namespace:My.Common.Behaviors"
...
>
<i:Interaction.Behaviors>
<Behaviors:DataGridRowReadOnlyBehavior/>
</i:Interaction.Behaviors>
<DataGrid.Resources>
<Style TargetType="{x:Type DataGridRow}">
<Style.Triggers>
<DataTrigger Binding="{Binding IsReadOnly}" Value="True"/>
<Setter Property="Behaviors:ReadOnlyService.IsReadOnly" Value="True"/>
<Setter Property="Foreground" Value="LightGray"/>
<Setter Property="ToolTipService.ShowOnDisabled" Value="True"/>
<Setter Property="ToolTip" Value="Disabled in ViewModel"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
...
</DataGrid>
using System.Windows;
namespace My.Common.Behaviors
{
internal class ReadOnlyService : DependencyObject
{
#region IsReadOnly
/// <summary>
/// IsReadOnly Attached Dependency Property
/// </summary>
private static readonly DependencyProperty BehaviorProperty =
DependencyProperty.RegisterAttached("IsReadOnly", typeof(bool), typeof(ReadOnlyService),
new FrameworkPropertyMetadata(false));
/// <summary>
/// Gets the IsReadOnly property.
/// </summary>
public static bool GetIsReadOnly(DependencyObject d)
{
return (bool)d.GetValue(BehaviorProperty);
}
/// <summary>
/// Sets the IsReadOnly property.
/// </summary>
public static void SetIsReadOnly(DependencyObject d, bool value)
{
d.SetValue(BehaviorProperty, value);
}
#endregion IsReadOnly
}
}
using System;
using System.Windows.Controls;
using System.Windows.Interactivity;
namespace My.Common.Behaviors
{
/// <summary>
/// Custom behavior that allows for DataGrid Rows to be ReadOnly on per-row basis
/// </summary>
internal class DataGridRowReadOnlyBehavior : Behavior<DataGrid>
{
protected override void OnAttached()
{
base.OnAttached();
if (this.AssociatedObject == null)
throw new InvalidOperationException("AssociatedObject must not be null");
AssociatedObject.BeginningEdit += AssociatedObject_BeginningEdit;
}
private void AssociatedObject_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
{
var isReadOnlyRow = ReadOnlyService.GetIsReadOnly(e.Row);
if (isReadOnlyRow)
e.Cancel = true;
}
protected override void OnDetaching()
{
AssociatedObject.BeginningEdit -= AssociatedObject_BeginningEdit;
}
}
}
我发现一对夫妇简单的解决方案这个问题。在我看来,最好是挂钩到DataGrid的BeginningEdit事件。这是类似于奈杰尔斯宾塞在他的岗位做了,但是你不必从数据网格覆盖它。该解决方案是伟大的,因为它不允许用户编辑任何行中的细胞,但它确实让他们选择行。
在代码背后:
private void MyList_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
{
if (((MyCustomObject)e.Row.Item).IsReadOnly) //IsReadOnly is a property set in the MyCustomObject which is bound to each row
{
e.Cancel = true;
}
}
在XAML:
<DataGrid ItemsSource="{Binding MyObservableCollection}"
BeginningEdit="MyList_BeginningEdit">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Name}"
Header="Name"/>
<DataGridTextColumn Binding="{Binding Age}"
Header="Age"/>
</DataGrid.Columns>
</DataGrid>
不同的解决方案......这不允许用户选择该行所有,但在代码中并不需要额外的代码后面。
<DataGrid ItemsSource="{Binding MyObservableCollection}">
<DataGrid.Resources>
<Style TargetType="{x:Type DataGridRow}">
<Style.Triggers>
<DataTrigger Binding="{Binding IsReadOnly}"
Value="True" >
<Setter Property="IsEnabled"
Value="False" /> <!-- You can also set "IsHitTestVisble" = False but please note that this won't prevent the user from changing the values using the keyboard arrows -->
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Name}"
Header="Name"/>
<DataGridTextColumn Binding="{Binding Age}"
Header="Age"/>
</DataGrid.Columns>
</DataGrid>
我认为这样做最简单的方法是将IsReadOnly属性添加到DataGridRow类。这里是如何做到这一点here详细的文章奈杰尔·斯宾塞。