C# 实现洗牌算法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace Shuffle
{    
public partial class Form1 : Form   
 
{        
private int[] Matrix = new int[9];        
private int nRow = 0;        
private int nCol = 0;        
public Form1()        
{           
 InitializeComponent();            
InitializeMatrix();        
}        
public void InitializeMatrix()        
{
           
 for (int i = 0; i < 9; i++)            
{                
Matrix[i] = i;           
 }            
Random rnd = new Random(DateTime.Now.Millisecond * DateTime.Now.Second);            
for (int i = 0; i < 100; i++)            
{                

int a1 = rnd.Next(9);                
int a2 = (a1 + 1)%9;               
 Exchange(ref Matrix[a1], ref Matrix[a2]);           
 }        
}        
private void Exchange(ref int A1, ref int A2)        
{            
A1 = A1 ^ A2;            
A2 = A1 ^ A2;            
A1 = A1 ^ A2;        
}        
private int nUnitPixels = 50;
²¹³ä£º private void Form1_Paint(object sender, PaintEventArgs e) 
{ 
Rectangle oRect = new Rectangle();
 oRect.Width = nUnitPixels;
 oRect.Height = nUnitPixels; 
for (int i = 0; i < 3; i++) 
{ 
for (int j = 0; j < 3; j++) 
{ 
oRect.X = j * nUnitPixels; 
oRect.Y = i * nUnitPixels; 
e.Graphics.DrawRectangle(Pens.Blue, oRect);
e.Graphics.DrawString(Matrix[i * 3 + j].ToString(), new Font("΢ÈíÑźÚ", 18.0f), Brushes.Blue, oRect); 
} 
} 
oRect.X = nCol * nUnitPixels;
 oRect.Y = nRow * nUnitPixels;
 e.Graphics.DrawRectangle(new Pen(Color.Red,2.0f), oRect);