如何将复选框的IsChecked绑定到数据网格中的Expander IsExpanded [英] How to bind the IsChecked of a checkbox to Expander IsExpanded within a datagrid

问题描述

好的，我现在非常沮丧，请记住，我是WPF的新手，因此具有约束力..

我有一个

Datagrid(在tabcontrol中).在Datagrid中有一个扩展器.我在窗口顶部有一个复选框，称为chkExpandAll.我想将扩展器的IsExpanded绑定到复选框的IsChecked.换句话说，我希望在选中复选框时扩展数据网格中的所有扩展器.

在"Windows资源"部分中，我有:

Okay, I''m getting highly frustrated right now, and keep in mind that I am brand new to WPF and binding so..

I have a

Datagrid (that is within a tabcontrol). Within the Datagrid is an expander. I have a checkbox at the top of the Window called chkExpandAll. I want to bind the IsExpanded of the expander to the IsChecked of the checkbox. In other words I wish to expand all of the expanders in the datagrid when I select the checkbox.

In my Windows Resources section I have:

<local:BooleanToVisibilityConverter x:Key="boolConvertNormal" />

该复选框列为:

The checkbox is listed as:

<CheckBox Content="Expand All" Name="chkExpandAll" VerticalAlignment="Center" Margin="5,0,5,0" />

然后在我的扩展器上有这个:

And then on my expander I have this:

<Expander Header="{Binding}" IsExpanded="{Binding IsChecked, ElementName=chkExpandAll, Converter={StaticResource ResourceKey=boolConvertNormal}, Mode=TwoWay}"  >

当我运行该应用程序，然后单击复选框时，没有任何反应.

哦，这是该资源的代码:

When I run the app and then click the checkbox nothing happens.

Oh, and here is the code for the resource:

public sealed class BooleanToVisibilityConverter : IValueConverter
   {
       public bool IsReversed { get; set; }
       public bool UseHidden { get; set; }
       public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
       {
           var val = System.Convert.ToBoolean(value, CultureInfo.InvariantCulture);
           if (this.IsReversed)
           {
               val = !val;
           }
           if (val)
           {
               return Visibility.Visible;
           }
           return this.UseHidden ? Visibility.Hidden : Visibility.Collapsed;
       }
       public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
       {
           throw new NotImplementedException();
       }
   }

推荐答案

好吧，我再次检查了复选框是否被选中，而对于我来说，我无法弄清为什么它不起作用.因此，我所做的是在我的视图模型上创建了一个名为Expanded的新属性，然后在复选框的Checked/Unchecked事件中，将视图模型的属性设置为true/false，然后将扩展器的IsExpanded绑定到viewmodel属性.

Well I double checked that the checkbox was getting checked, and for the life of me I could not figure out why it wasn''t working. So what I did instead was created a new property on my viewmodel called Expanded and then on the Checked/Unchecked events of the checkbox I set the property of the viewmodel''s to true/false, I then bound the IsExpanded of the expander to the viewmodel property.

<expander header="{Binding}" isexpanded="{Binding Path=isRowExpanded}"></expander>

public bool isRowExpanded
        {
            get;
            set;
        }

老实说，我不喜欢这种解决方案，而且我觉得它会变慢，因为我必须重申各行并更新该属性.但是它现在可以使用了，所以我就离开了.

Honestly I don''t like this solution and I feel it will be to slow as I have to reiterate over the rows and update the property. But it works for now so I''m leaving it.

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