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XPath : Bind to last item of collection

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野的像风
野的像风 2021-01-24 12:16

Can I Bind TextBox.Text to last item of an ObservableCollection ?

I tried this:
2条回答
  • 终归单人心
    终归单人心 (楼主)
    2021-01-24 12:55

    Please try the method following,

    1, use IValueConverter.

    class DataSourceToLastItemConverter : IValueConverter
{
    public object Convert(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        IEnumerable items = value as IEnumerable;
        if (items != null)
        {
            return items.LastOrDefault();
        }
        else return Binding.DoNothing;
    }

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



    Then binding like this:
    


    
    
        
    
    


    
    
    
             
    
                                                        
    
            
            
    
              
                
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