IConverter C#,wpf ,checkbox.Checked

本文关键字：Checked checkbox wpf IConverter | 更新日期: 2023-09-27 18:11:52

XAML Code

<TreeView.Resources>
  <local:BoolToVisibleOrHidden x:Key="BoolToVisConverter" Collapse="True"/>
</TreeView.Resources>
<TreeViewItem Header="First Child" Name="_firstChild"  
  Visibility="{Binding Path=VisibleOnCheck, Mode=OneWay, NotifyOnTargetUpdated=True, Converter={StaticResource BoolToVisConverter}}" />
 <CheckBox Name="_checkBoxvisible" IsChecked="{Binding Path= VisibleOnCheck, Mode=TwoWay}" Content="show" Checked="CheckBox />

复选框选中

private void CheckBox(object sender, RoutedEventArgs e)
{
  if (MessageBox.Show("", "", MessageBoxButton.YesNo) == 
    System.Windows.Forms.DialogResult.Yes)
  {   
    VisibleOnCheck = true;
  } 
  else
  {
    VisibleOnCheck = false; 
  }
}

模型代码

Private bool __visible;
public bool VisibleOnCheck
{
    get { return _ visible; }
    set { _visible = value; OnPropertyChanged("VisibleOnCheck "); }
}
public class BoolToVisibleOrHidden : IValueConverter
{
    #region Constructors
    public BoolToVisibleOrHidden() { }
    #endregion
    #region Propertie Collapse
    public bool Collapse { get; set; }
    public bool Reverse { get; set; }
    #endregion
    #region IValueConverter Members
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        bool bValue = (bool)value;
            if (bValue != Reverse)
            {
                return Visibility.Visible;
            }
            else
            {
                if (Collapse)
                    return Visibility.Collapsed;
                else
                    return Visibility.Hidden;
            }
    }
    public object ConvertBack(object value, Type targetType, object parameter,
                              System.Globalization.CultureInfo culture)
    {
        Visibility visibility = (Visibility) value;
        if (visibility == Visibility.Visible)
            return !Reverse;
        else
            return Reverse;
    }
    #endregion
    }

我想，当MessageBox . yes点击时，Treeview项目头应该是可见的，但这里是可见的MessageBox和TreeviewItem同时没有点击MessageBox。是的，有谁能帮忙吗?

IConverter C#,wpf ,checkbox.Checked

复选框上有一个双向绑定到VisibleOnCheck，所以如果你选中了Checkbox，它将在TreeViewItem上切换Visibility。

如果你想在基于DialogResult的Checked事件处理程序中处理VisibleOnCheck，你必须删除双向绑定或完全删除绑定。

<CheckBox Name="_checkBoxvisible" Content="show" Checked="CheckBox />

我还建议使用WPF MessageBox而不是Winforms，为MessageBox拖入另一个框架似乎有点奇怪。

private void CheckBox(object sender, RoutedEventArgs e)
{
   VisibleOnCheck = MessageBox.Show("","", MessageBoxButton.YesNo) == MessageBoxResult.Yes;
}

编辑

由于问题是由于两个控件绑定到VisibleOnCheck，你可以直接绑定TreeViewItem Visibility到Xaml中的Checkbox 

<TextBlock Text="TreeViewItem" Visibility="{Binding IsChecked, ElementName=chkbx, Converter={StaticResource BooleanToVisibilityConverter}}" />
<CheckBox x:Name="chkbx" Content="CheckBox" Checked="Checked"   />

和在事件中设置IsChecked基于你的对话结果

private void Checked(object sender, RoutedEventArgs e)
{
     (sender as CheckBox).IsChecked = MessageBox.Show("","", MessageBoxButton.YesNo) == MessageBoxResult.Yes;
}
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