顯示基於所選單選按鈕的控件

Question

我有一組三個單選按鈕。根據所選的單選按鈕，我想忽略三個控件之一 - 一個文本框，一個下拉列表或一個按鈕。如何根據所選單選按鈕的結果顯示控件？

Answer 1

您可以將控件綁定到的單選按鈕的器isChecked財產的知名度，使用BooleanToVisibilityConverter：

<Page 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> 
    <Page.Resources> 
    <BooleanToVisibilityConverter x:Key="convVisibility"/> 
    </Page.Resources> 
    <Grid> 
    <StackPanel Orientation="Vertical"> 
     <RadioButton Name="radioButton1" GroupName="group1">Control1</RadioButton> 
     <RadioButton Name="radioButton2" GroupName="group1">Control2</RadioButton> 
     <RadioButton Name="radioButton3" GroupName="group1">Control3</RadioButton> 
     <Grid> 
     <Button Visibility="{Binding IsChecked, ElementName=radioButton1, Converter={StaticResource convVisibility}}">1. Button</Button> 
     <TextBlock Visibility="{Binding IsChecked, ElementName=radioButton2, Converter={StaticResource convVisibility}}">2. TextBlock</TextBlock> 
     <TextBox Visibility="{Binding IsChecked, ElementName=radioButton3, Converter={StaticResource convVisibility}}">3. TextBox</TextBox> 
     </Grid> 
    </StackPanel> 
    </Grid> 
</Page> 

編輯：

這解決方案的偉大工程，這是很容易實現。無論如何，我可以阻止控件在設計模式下隱藏嗎？

我不知道其他設計師（混合爲例），但在Visual Studio設計的控制是從來沒有隱瞞過......

不管怎麼說，你可以實現自己的轉換器，它總是會返回在設計模式下可見。由於某些不明確的原因，BooleanToVisibilityConverter類是封閉的，所以你不能繼承它。您可以委託轉換爲BooleanToVisibilityConverter相反，如果你不希望重寫轉換邏輯：

public class MyBooleanToVisibilityConverter : IValueConverter 
{ 
    private BooleanToVisibilityConverter _converter = new BooleanToVisibilityConverter(); 
    private DependencyObject _dummy = new DependencyObject(); 

    private bool DesignMode 
    { 
     get 
     { 
      return DesignerProperties.GetIsInDesignMode(_dummy); 
     } 
    } 

    #region IValueConverter Members 

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     if (DesignMode) 
      return Visibility.Visible; 
     else 
      return _converter.Convert(value, targetType, parameter, culture); 
    } 

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     return _converter.ConvertBack(value, targetType, parameter, culture); 
    } 

    #endregion 
} 

Answer 2

爲了使組件在設計時可見，你可以在複選框true的FallbackValue添加爲：

<RadioButton x:Name="cbxEmail" Content="Email Details" IsEnabled="{Binding IsEmail, FallbackValue=true}" IsChecked="{Binding IsEmail, Mode=OneWay, FallbackValue=true}" 
           Grid.Column="2"/>