如何使用 INotifyPropertyChanged 更新数组绑定?

问题描述

假设我有一堂课:

class Foo
{
  public string Bar
  {
    get { ... }
  }

  public string this[int index]
  {
    get { ... }
  }
}

我可以使用{Binding Path=Bar}"和{Binding Path=[x]}"绑定到这两个属性.很好.

I can bind to these two properties using "{Binding Path=Bar}" and "{Binding Path=[x]}". Fine.

现在假设我想实现 INotifyPropertyChanged:

Now let's say I want to implement INotifyPropertyChanged:

class Foo : INotifyPropertyChanged
{
  public string Bar
  {
    get { ... }
    set
    {
      ...

      if( PropertyChanged != null )
      {
        PropertyChanged( this, new PropertyChangedEventArgs( "Bar" ) );
      }
    }
  }

  public string this[int index]
  {
    get { ... }
    set
    {
      ...

      if( PropertyChanged != null )
      {
        PropertyChanged( this, new PropertyChangedEventArgs( "????" ) );
      }
    }
  }

  public event PropertyChangedEventHandler PropertyChanged;
}

标记为?????的部分有什么内容?(我试过 string.Format("[{0}]", index) 但它不起作用).这是 WPF 中的错误，是否有替代语法，或者仅仅是 INotifyPropertyChanged 不如普通绑定强大?

What goes in the part marked ????? (I've tried string.Format("[{0}]", index) and it doesn't work). Is this a bug in WPF, is there an alternative syntax, or is it simply that INotifyPropertyChanged isn't as powerful as normal binding?

推荐答案

感谢 Cameron 的建议，我找到了正确的语法，即:

Thanks to Cameron's suggestion, I've found the correct syntax, which is:

Item[]

更新绑定到该索引属性的所有内容(所有索引值).

Which updates everything (all index values) bound to that indexed property.

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