AlternationConverter.cs source code in C# .NET

                        
Code:
                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Framework / System / Windows / Controls / AlternationConverter.cs / 1 / AlternationConverter.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) by Microsoft Corporation.  All rights reserved.
//  
//
// Description: Convert between index and a list of values. 
// 
//---------------------------------------------------------------------------
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization; 
using System.Windows.Data;
using System.Windows.Markup; 
 
namespace System.Windows.Controls
{ 
    ///

    /// AlternationConverter is intended to be used by a binding to the
    /// ItemsControl.AlternationIndex attached property.  It converts an integer
    /// into the corresponding item in Values list. 
    /// 
    [ContentProperty("Values")] 
    public class AlternationConverter : IValueConverter 
    {
        ///
 
        /// A list of values.
        ///

        public IList Values
        { 
            get { return _values; }
        } 
 
        ///

        /// Convert an integer to the corresponding value from the Values list. 
        ///
        public object Convert (object o, Type targetType, object parameter, CultureInfo culture)
        {
            if (_values.Count > 0 && o is int) 
            {
                int index = ((int)o) % _values.Count; 
                if (index < 0)  // Adjust for incorrect definition of the %-operator for negative arguments. 
                    index += _values.Count;
                return _values[index]; 
            }

            return DependencyProperty.UnsetValue;
        } 

        ///
 
        /// Convert an object to the index in the Values list at which that object appears. 
        /// If the object is not in the Values list, return -1.
        ///
 
        public object ConvertBack(object o, Type targetType, object parameter, CultureInfo culture)
        {
            return _values.IndexOf(o);
        } 

        List