一个简单的文件MD5码自动计算比较器（附源码）

主要对 多线程更新 winform 不是特别清楚，绕来绕去，搞得很晕乎，主要代码如下， 还请各位大侠多多指点，谢谢！

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.IO;
using System.Threading;namespace FileMD5 {
 public partial class MainForm : Form {
 public MainForm() {
 InitializeComponent();
 } private void button_file_Click(object sender, EventArgs e) {
 OpenFileDialog fileDialog = new OpenFileDialog();
 fileDialog.Title = "请选择文件";
 fileDialog.RestoreDirectory = true; if (fileDialog.ShowDialog() == DialogResult.OK) {
 textBox_file.Text = fileDialog.FileName;
 textBox_result.Text = "";
 FileInfo file = new FileInfo(fileDialog.FileName);
 fileSzie = file.Length;
 showFilesize(fileSzie);
 } } private void button_exit_Click(object sender, EventArgs e) {
 this.Close();
 this.Dispose();
 } private void button_check_Click(object sender, EventArgs e) {
 checkResult();
 } MD5 md5 = (MD5)CryptoConfig.CreateFromName("MD5");
 long fileSzie = 0; private void button_calc_Click(object sender, EventArgs e) {
 string file = textBox_file.Text; if (file.Length == 0) {
 textBox_result.Text = "请先重新选择文件!";
 return;
 } FileStream fs = null;
 try {
 fs = new FileStream(file, FileMode.Open, FileAccess.Read);
 } catch (SystemException) {
 textBox_result.Text = "文件打开错误,请重新选择文件!";
 return;
 } //对于大于 100M 的文件启用多线程
 if (fs.Length > 100L * 1024 * 1024) { string message = "文件已经超过 100M ，需要较长的计算时间。\n软件将启动后台线程进行处理。是否继续？";
 string caption = "文件较大";
 MessageBoxButtons buttons = MessageBoxButtons.YesNo; if (MessageBox.Show(message, caption, buttons) == System.Windows.Forms.DialogResult.No) {
 fs.Close();
 textBox_result.Text = "文件较大，未计算。";
 return;
 }
 textBox_result.Text = "正在计算中，请稍候......";
 button_calc.Enabled = false;
 button_file.Enabled = false; Thread thread = new Thread(new ParameterizedThreadStart(calcMD5));
 thread.Start(fs); } else {
 calcMD5(fs);
 }
 } //建立一个 object 参数的函数，是为了处理线程调用中，使用参数的问题。
 private void calcMD5(object fs) {
 calcMD5((FileStream)fs);
 } // Invoke 函数需要使用的委托
 delegate void updateWindows(byte[] result); private void calcMD5(FileStream fs) {
 byte[] md5byte = md5.ComputeHash(fs); if (this.InvokeRequired) {
 this.Invoke(new updateWindows(showResult), md5byte);
 } else {
 showResult(md5byte);
 }
 fs.Close();
 } private void showResult(byte[] md5byte) {
 int i, j;
 StringBuilder sb = new StringBuilder(32);
 foreach (byte b in md5byte) {
 i = Convert.ToInt32(b);
 j = i >> 4;
 sb.Append(Convert.ToString(j, 16));
 j = ((i << 4) & 0x00ff) >> 4;
 sb.Append(Convert.ToString(j, 16));
 } String result = sb.ToString().ToUpper(); textBox_result.Text = result;
 button_calc.Enabled = true;
 button_file.Enabled = true;
 checkResult(); } private void checkResult() { string result = textBox_result.Text; if (textBox_md5.Text.Length == 0) {
 textBox_compare.Text = "";
 textBox_compare.Visible = false;
 return;
 } if(result.Length != 32 ) {
 textBox_compare.Visible = true;
 textBox_compare.BackColor = Color.Pink;
 textBox_compare.Text = "计算结果框中不是MD5码，请先进行计算！";
 return;
 } if (textBox_md5.Text.Trim().ToUpper().Equals(result.ToUpper())) {
 textBox_compare.Visible = true;
 textBox_compare.BackColor = Color.LightGreen;
 textBox_compare.Text = "MD5码 已匹配，文件未被修改，可放心使用！";
 } else {
 textBox_compare.Visible = true;
 textBox_compare.BackColor = Color.Red;
 textBox_compare.Text = "MD5码 不匹配，文件已被修改，请小心！";
 }
 } private void showFilesize(long size) { float d_size;
 string unit = "Byte"; if (size > 1024 * 1024 * 1024) { //大于 1G 的显示
 d_size = size / (float)(1024 * 1024 * 1024);
 unit = "GB";
 } else {
 if (size > 1024 * 1024) { //大于 1M 的显示
 d_size = size / (float)(1024 * 1024);
 unit = "MB";
 } else {
 if (size > 1024) { //大于 1K 的显示
 d_size = size / (float)(1024);
 unit = "KB";
 } else {
 d_size = size;
 }
 }
 }
 textBox_filesize.Text = string.Format(" {0:F} {1} ( {2:N0}字节 )", d_size, unit, size);
 }
 }
}

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