The StringFormat parameter of MultiBinding is incorrect.

The StringFormat parameter of MultiBinding is incorrect.

In the binding of wpf, we will use multi-value binding, as shown below:

 
<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>

If

StringFormat = "{3} ({0}/{1}): {2}" in this case, the write cannot pass the compiler. The solution is to add a set of braces in front of it, as follows:

StringFormat = "{}{ 3} ({0}/{1}): {2 }"

Complete binding is as follows:

 
<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>