調用從XAML

Question

C＃功能在我的XAML我有這樣

<Expander ExpandDirection="Down" Width="Auto" Padding="4"> 
    <Expander.Style> 
     <Style TargetType="Expander"> 
      <Setter Property="IsExpanded" Value="{Binding XPath=@Expand}" /> 
      <Setter Property="Header" Value="{Binding XPath=@Name}" /> 
      <Setter Property="FontWeight" Value="Bold" /> 

      <Style.Triggers> 
       <DataTrigger Binding="{Binding IsExpanded,RelativeSource={RelativeSource Self}}" Value="True"> 
       </DataTrigger> 
      </Style.Triggers> 
     </Style> 
    </Expander.Style> 
    <ListBox Name="itemsList" 
    ItemsSource="{Binding XPath=UpgradeAction}" 
    ItemTemplate="{StaticResource dtListItemTemplate}" 
    SelectionChanged="listItems_SelectionChanged" 
    Style="{StaticResource styleListBoxUpgradeAction}" 
    ItemContainerStyle="{StaticResource styleListBoxItemUpgradeAction}"> 
    </ListBox> 
</Expander> 

而是頭的值的擴張來自@Name我想有一個C＃函數採取在@Name從XAML，做一些事情，然後輸出一個新的字符串作爲Value。因此，這將是這個樣子

<Setter Property="Header" Value="C_Sharp_Function({Binding XPath=@Name})" /> 

我有我需要使用，但我怎麼在XAML執行呢？很抱歉，如果這聽起來像一個愚蠢的問題的功能，我是新來的C＃和XAML 。任何幫助深表感謝！

編輯

下面是一些我在二傳手試圖替換一個多值轉換的東西。我認爲它應該看起來像this中的答案。

<Setter Property="Header" Value="{{Binding XPath=@Name, Converter={StaticResource NameConverter}}, {Binding XPath=@Value, Converter={StaticResource NameConverter}}}" /> 

<Setter Property="Header" Value="{Binding XPath={@Name, @Value}, Converter={StaticResource NameConverter}}" /> 

Answer 1

你所描述的是一個value converter。它看起來有點不同，但邏輯上它是一樣的。

public class NameConverter : IValueConverter 
{ 
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     var name = (XmlAttribute)value; 

     // Do anything you like in here. This is just an example. 

     return "something based on " + name.Value; 
    } 

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
} 

XAML：

<Window.Resources> 
    <local:NameConverter x:Key="NameConverter" /> 

    <!-- ... --> 

...

<Expander ExpandDirection="Down" Width="Auto" Padding="4"> 
    <Expander.Style> 
     <Style TargetType="Expander"> 
      <Setter Property="IsExpanded" Value="{Binding XPath=@Expand}" /> 
      <Setter 
       Property="Header" 
       Value="{Binding XPath=@Name, Converter={StaticResource NameConverter}}" 
       /> 

如果你想在一個以上的參數來傳遞，您可以使用multi-binding與multi-value converter。

我不確定你爲什麼要做擴展器風格的所有綁定。以下應該同樣適用。我還包括一個更簡單的方法來做IsExpanded觸發器。

public class NameValueConverter : IMultiValueConverter 
{ 
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) 
    { 
     var attrName = (XmlAttribute)values[0]; 
     var attrValue = (XmlAttribute)values[1]; 

     // Do stuff here. 

     return attrName.Value + " -> " + attrValue.Value; 
    } 

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
} 


<Window.Resources> 
    <local:NameValueConverter x:Key="NameValueConverter" /> 
</Window.Resources> 

...

<Expander 
    ExpandDirection="Down" 
    Width="Auto" 
    Padding="4" 
    IsExpanded="{Binding XPath=@Expand}" 
    > 
    <Expander.Style> 
     <Style TargetType="Expander"> 
      <Setter Property="FontWeight" Value="Bold" /> 

      <Style.Triggers> 
       <!-- 
       You can do a regular Trigger instead of a DataTrigger and not 
       have to bother with RelativeSource=Self 
       --> 
       <Trigger 
        Property="IsExpanded" 
        Value="True"> 
        <!-- stuff --> 
       </Trigger> 
      </Style.Triggers> 
     </Style> 
    </Expander.Style> 
    <Expander.Header> 
     <MultiBinding Converter="{StaticResource NameValueConverter}"> 
      <Binding XPath="@Name" /> 
      <Binding XPath="@Value" /> 
     </MultiBinding> 
    </Expander.Header> 
</Expander> 

---

這裏就是Window.Resources雲：

<Window 
    ...x:Class="..." and other attributes... 
    > 
    <Window.Resources> 
     <local:NameConverter x:Key="NameConverter" /> 

     <!-- other resources --> 
    </Window.Resources> 
    <Grid> 
     <!-- The controls that go in the window --> 
    </Grid> 
</Window