Using a Simple Delegate - CSharp Custom Type

CSharp examples for Custom Type:delegate

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Description

Using a Simple Delegate

Demo Code

using System;//from  ww  w . j av a2  s.  c  o  m
public class SortClass
{
    static public int val1;
    static public int val2;
    public delegate void Sort(ref int a, ref int b);
    public void DoSort(Sort ar)
    {
        ar(ref val1, ref val2);
    }
}
public class SortProgram
{
    public static void Ascending(ref int first, ref int second)
    {
        if (first > second)
        {
            int tmp = first;
            first = second;
            second = tmp;
        }
    }
    public static void Descending(ref int first, ref int second)
    {
        if (first < second)
        {
            int tmp = first;
            first = second;
            second = tmp;
        }
    }
    public static void Main()
    {
        SortClass.Sort up = new SortClass.Sort(Ascending);
        SortClass.Sort down = new SortClass.Sort(Descending);
        SortClass doIT = new SortClass();
        SortClass.val1 = 310;
        SortClass.val2 = 220;
        Console.WriteLine("Before Sort: val1 = {0}, val2 = {1}", SortClass.val1, SortClass.val2);
        doIT.DoSort(up);
        Console.WriteLine("After Sort: val1 = {0}, val2 = {1}", SortClass.val1, SortClass.val2);
        Console.WriteLine("Before Sort: val1 = {0}, val2 = {1}", SortClass.val1, SortClass.val2);
        doIT.DoSort(down);
        Console.WriteLine("After Sort: val1 = {0}, val2 = {1}", SortClass.val1, SortClass.val2);
    }
}

Result


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