MultiBinding的StringFormat參數問題

在wpf的綁定中，我們會用到多值綁定，如下：

<MultiBinding Mode="OneWay" StringFormat="{3}({0}/{1})：{2}">
        <Binding Path="CurIndex" Mode="OneWay"></Binding>
        <Binding Path="TotalCount" Mode="OneWay"></Binding>
        <Binding Path="CurName" Mode="OneWay"></Binding>
        <Binding Path="AreaName" Mode="OneWay"></Binding>
</MultiBinding>

這裡如果

StringFormat="{3}({0}/{1})：{2}"這樣寫是不能通過編譯器的，解決方案是在前面加一組大括弧就可以了，如下：

StringFormat="{}{3}({0}/{1})：{2}"

完整綁定如下：

<TextBlock.Text>
          <MultiBinding Mode="OneWay" StringFormat="{}{3}({0}/{1})：{2}">
          <Binding Path="CurIndex" Mode="OneWay"></Binding>
          <Binding Path="TotalCount" Mode="OneWay"></Binding>
          <Binding Path="CurName" Mode="OneWay"></Binding>
           <Binding Path="AreaName" Mode="OneWay"></Binding>
           </MultiBinding>
</TextBlock.Text>