WPF Datagrid具有一些只读行 [英] WPF Datagrid with some read-only rows

问题描述

我需要将一些WPF Datagrid行显示为只读或不依赖于绑定模型上的属性。

I have the need to show some of my WPF Datagrid rows as read only or not depending on a property on my bound model.

如何做到这一点？

推荐答案

我也有同样的问题。
使用jsmith答案中提供的信息和Nigel Spencer的博客，我提出了一个解决方案，它不需要更改WPF DataGrid源代码，子类化或添加代码来查看codebehind 。你可以看到，我的解决方案是非常MVVM友好。

I had the same problem. Using information provided in jsmith's answer and on Nigel Spencer's blog, I've come up with a solution that doesn't require changing WPF DataGrid source code, subclassing or adding code to view's codebehind. As you can see, my solution is very MVVM Friendly.

它使用表达式混合附加行为机制，因此您需要安装Expression Blend SDK并添加对Microsoft.Expression.Interactions.dll的引用，但是如果您不喜欢此行为，则可以轻松将此行为转换为本机附加行为 。

It uses Expression Blend Attached Behavior mechanism so you'll need to install Expression Blend SDK and add reference to Microsoft.Expression.Interactions.dll, but this behavior could be easily converted to native attached behavior if you don't like that.

<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>

---

ReadOnlyService.cs

---

ReadOnlyService.cs

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
    }
}

---

DataGridRowReadOnlyBehavior.cs

---

DataGridRowReadOnlyBehavior.cs

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;
        }
    }
}

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