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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;
namespace FLY.ControlLibrary.Converter
{
/// <summary>
/// 列表转序号
/// </summary>
[ValueConversion(typeof(object), typeof(int))]
public class Item2IndexConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
int result = -1;
if (value != null)
{
var collectionViewSource = parameter as CollectionViewSource;
if (collectionViewSource != null)
{
var cv = (CollectionView)collectionViewSource.View;
//在 设计模式中， View为null, 所以下面必须判断
if (cv != null)
{
result = cv.IndexOf(value);
}
}
}
return result >= 0 ? result : System.Windows.DependencyProperty.UnsetValue;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
}