C/S结构的应用程序更新.

微软为我们投供了click once 来安装程序和更新程序,当然有时候我们需要自己来开发一个更新程序,事实上更新程序的原理很简单的,只是简单的copy,replace文件而也(个人认为)..换掉一些旧的dll文件或者加一些新的文件之类,知道这样的道理也许写一个更新程序就比的比较容易了.下面是一些源程序:如果你是局域网的,并且你可以访问服务器上的文件夹的时候,就可以用File.Copy来实现文件的Copy.这种方法适用一个域内的,即客户端和更新路径在一个域里,且客户端对更新路径有一个权限.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using System.Threading;
using System.Net;
using System.IO;
using System.Data.SqlClient;
namespace iTraz.Updater
{
    public partial class frmUpdater : Form
    {
        bool flag = false;//indicate whether the version has changed
        public frmUpdater()
        {
            InitializeComponent();
        }

        private void frmUpdater_Load(object sender, EventArgs e)
        {
            try
            {             
                updateDll();
                callMainForm();

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void callMainForm()
        {
            try
            {

               //start other exe after updating dll.
                string fileName = System.Environment.CurrentDirectory + "\\" + "Start.exe";
                System.Diagnostics.Process.Start(fileName);

                this.Close();
            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message);

            }
        }

        private void updateDll()
        {
            try
            {

                //server path..
                string url = "\\192.28.1.12\\updatePath\\test.dll";          

                //local path.
                //  Assembly asm = Assembly.GetExecutingAssembly();
               string str = Assembly.GetExecutingAssembly().GetName().CodeBase;
                if (str.ToLower().IndexOf("file:///") >= 0)
                {
                    str = str.Substring(8, str.Length - 8);
                }
                string fileName = System.IO.Path.GetDirectoryName(str)+"\\"+"test.dll";

                //here can add extra code for comparing two files's update date..if they are same..no need update.

                if(File.Exist(fileName))

                    File.Delete(fileName);

                File.Copy(url,fileName,true);
                }
            catch
            {
                MessageBox.Show("can not access update path on server.");
            }    
       }

    }
}

当然这种File.Copy需要你有一定的权限.客户端必须具备读和写入更新路径的权限

如果你的客户端和更新路径不在一个域内的话,我们可以用下面的方法,我们可以改写updetadll这个方法

   try
            {               

                 //server path..
                string url = "\\192.28.1.12\\updatePath\\test.dll";            

                //local path.
                //  Assembly asm = Assembly.GetExecutingAssembly();
               string str = Assembly.GetExecutingAssembly().GetName().CodeBase;
                if (str.ToLower().IndexOf("file:///") >= 0)
                {
                    str = str.Substring(8, str.Length - 8);
                }
                string fileName = System.IO.Path.GetDirectoryName(str)+"\\"+"test.dll";

                //use http for updating.
                WebRequest request = WebRequest.Create(url);
                WebResponse response= request .GetResponse();

                Stream rec= response.GetResponseStream();

                //delete all old files
                File.Delete(fileName);
                FileStream fs = new FileStream(fileName, FileMode.CreateNew);
                try
                {
                    List<byte> lstByte = new List<byte>();
                    while (true)
                    {
                        //read data from new files
                        int i = rec.ReadByte();

                        if (i == -1)
                        {
                            break;
                        }
                        fs.WriteByte(Convert.ToByte(i));
                    }
                }
                finally
                {
                    if (fs != null)
                        fs.Close();
                    response.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                request.DefaultWebProxy = null;
            }

其实很简单吧.如果用clickOnce 的话,我想会更简单的哦,呵呵!