我的XAML中有一些RadioButton …
<StackPanel>
<RadioButton Name="RadioButton1" GroupName="Buttons" Click="ButtonsChecked" IsChecked="True">One</RadioButton>
<RadioButton Name="RadioButton2" GroupName="Buttons" Click="ButtonsChecked">Two</RadioButton>
<RadioButton Name="RadioButton3" GroupName="Buttons" Click="ButtonsChecked">Three</RadioButton>
</StackPanel>
我可以在Visual Basic代码中处理他们的点击事件.这样做…
Private Sub ButtonsChecked(ByVal sender As System.Object,_
ByVal e As System.Windows.RoutedEventArgs)
Select Case CType(sender,RadioButton).Name
Case "RadioButton1"
'Do something one
Exit Select
Case "RadioButton2"
'Do something two
Exit Select
Case "RadioButton3"
'Do something three
Exit Select
End Select
End Sub
但是,我想改进它.此代码失败…
<StackPanel>
<RadioButton Name="RadioButton1" GroupName="Buttons" Click="ButtonsChecked" Command="one" IsChecked="True">One</RadioButton>
<RadioButton Name="RadioButton2" GroupName="Buttons" Click="ButtonsChecked" Command="two">Two</RadioButton>
<RadioButton Name="RadioButton3" GroupName="Buttons" Click="ButtonsChecked" Command="three">Three</RadioButton>
</StackPanel>
Private Sub ButtonsChecked(ByVal sender As System.Object,RadioButton).Command
Case "one"
'Do something one
Exit Select
Case "two"
'Do something two
Exit Select
Case "three"
'Do something three
Exit Select
End Select
End Sub
在我的XAML中,我在Command =属性上得到一个蓝色的squiggly下划线,这个提示…
'CommandValueSerializer' ValueSerializer cannot convert from 'System.String'.
在我的VB中,我在Select Case行上看到一个绿色的下划线,这个警告…
Runtime errors might occur when converting 'System.Windows.Input.ICommand' to 'String'.
更好的是使用Enum类型的命令与完整的Intellisense和编译错误,而不是运行时错误,以防打印错误.如何改善这个？
为了使命令工作,您需要在xaml或后面的代码中设置绑定.这些命令绑定必须引用先前声明的公共静态字段.
然后在您的按钮Command属性中,然后您还需要引用这些相同的命令.
<Window
x:Class="RadioButtonCommandSample.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:RadioButtonCommandSample"
Title="Window1"
Height="300"
Width="300"
>
<Window.CommandBindings>
<CommandBinding Command="{x:Static local:Window1.CommandOne}" Executed="CommandBinding_Executed"/>
<CommandBinding Command="{x:Static local:Window1.CommandTwo}" Executed="CommandBinding_Executed"/>
<CommandBinding Command="{x:Static local:Window1.CommandThree}" Executed="CommandBinding_Executed"/>
</Window.CommandBindings>
<StackPanel>
<RadioButton Name="RadioButton1" GroupName="Buttons" Command="{x:Static local:Window1.CommandOne}" IsChecked="True">One</RadioButton>
<RadioButton Name="RadioButton2" GroupName="Buttons" Command="{x:Static local:Window1.CommandTwo}">Two</RadioButton>
<RadioButton Name="RadioButton3" GroupName="Buttons" Command="{x:Static local:Window1.CommandThree}">Three</RadioButton>
</StackPanel>
</Window>
public partial class Window1 : Window
{
public static readonly RoutedCommand CommandOne = new RoutedCommand();
public static readonly RoutedCommand CommandTwo = new RoutedCommand();
public static readonly RoutedCommand CommandThree = new RoutedCommand();
public Window1()
{
InitializeComponent();
}
private void CommandBinding_Executed(object sender,ExecutedRoutedEventArgs e)
{
if (e.Command == CommandOne)
{
MessageBox.Show("CommandOne");
}
else if (e.Command == CommandTwo)
{
MessageBox.Show("CommandTwo");
}
else if (e.Command == CommandThree)
{
MessageBox.Show("CommandThree");
}
}
}