WebClient下载文件

代码如下：

 

using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Net;
using System.Threading;
using System.IO;
using System.Windows.Forms;
using System.Data;

namespace CYSoft.CommonLib
{

    public partial class WebDownloadFile : Component
    {

        #region 变量属性

        /// <summary>
        /// 下载过程进度事件
        /// </summary>
        /// <param name="e"></param>
        public delegate void ProgressChangedEventHandler(DownLoadFileInfo fileInfo, int percentage);
        public event ProgressChangedEventHandler ProgressChangedEvent;

        /// <summary>
        /// 下载完成
        /// </summary>
        /// <param name="fileInfo"></param>
        /// <param name="e"></param>
        public delegate void DownloadFileCompletedEventHandler();
        public event DownloadFileCompletedEventHandler DownloadFileCompletedEvent;

        /// <summary>
        /// 一个文件下载完成
        /// </summary>
        /// <param name="fileInfo"></param>
        /// <param name="e"></param>
        public delegate void DownloadOneFileCompletedEventHandler(DownLoadFileInfo fileInfo);
        public event DownloadOneFileCompletedEventHandler DownloadOneFileCompletedEvent;

        /// <summary>
        /// 需要下载的文件列表（）
        /// </summary>
        private List<DownLoadFileInfo> m_DownLoadFiles = null;
        public List<DownLoadFileInfo> DownLoadFiles
        {
            set { m_DownLoadFiles = value; }
            get { return m_DownLoadFiles; }
        }

        private WebClient m_web = null;

        /// <summary>
        /// 当前下载的文件是否完成
        /// </summary>
        private bool m_isFinished = false;

        /// <summary>
        /// 当前下载文件信息
        /// </summary>
        private DownLoadFileInfo m_fileInfo = null;

        /// <summary>
        /// 已经下载文件个数
        /// </summary>
        private int m_downFileCount = 0;

        /// <summary>
        /// 下载是否完成
        /// </summary>
        public bool DownLoadFinished
        {
            get
            {
                if (DownLoadFiles != null && DownLoadFiles.Count == m_downFileCount)
                    return true;
                else
                    return false;
            }
        }

 

        #endregion

        #region 构造函数

        public WebDownloadFile()
        {
            InitializeComponent();
        }

        public WebDownloadFile(IContainer container)
        {
            container.Add(this);

            InitializeComponent();
        }

        #endregion

        #region 函数方法

       
       /// <summary>
        /// 开始下载
        /// </summary>
        public void StartDownload()
        {
            try
            {
                foreach (DownLoadFileInfo info in DownLoadFiles)
                {
                    m_isFinished = false;
                    m_fileInfo = info;
                    m_web = new WebClient();
                    m_web.DownloadProgressChanged += new DownloadProgressChangedEventHandler(web_DownloadProgressChanged);
                    m_web.DownloadFileCompleted += new AsyncCompletedEventHandler(web_DownloadFileCompleted);

                    //判断没有路径则创建一个
                    if (!Directory.Exists(info.fileSavePath))
                        Directory.CreateDirectory(info.fileSavePath);

                    string url = info.fileWebUrl;
                    string fileFullName = info.fileSavePath + "//" + info.fileName;

                    //判断文件已经存在则删除原有文件
                    if (File.Exists(fileFullName))
                        File.Delete(fileFullName);

                    m_web.DownloadFileAsync(new Uri(url), fileFullName);

                    while (!m_isFinished)
                    {
                        Application.DoEvents();
                        Thread.Sleep(1);
                    }
                }
                if (DownLoadFinished)
                    if (DownloadFileCompletedEvent != null)
                        DownloadFileCompletedEvent();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 下载进程事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void web_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            try
            {
                if (ProgressChangedEvent != null)
                    ProgressChangedEvent(m_fileInfo, e.ProgressPercentage);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 下载完成
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void web_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
            try
            {
                if (e.Cancelled)
                    return;
                if (e.Error == null)
                    m_downFileCount += 1;

                if (DownloadOneFileCompletedEvent != null)
                    DownloadOneFileCompletedEvent(m_fileInfo);
            }
            //catch (WebException exp)
            //{
            //    MessageBox.Show(String.Format("无法找到指定资源/n/n{0}", exp.Message), "自动升级", MessageBoxButtons.OK, MessageBoxIcon.Error);
            //}
            //catch (XmlException exp)
            //{
            //    MessageBox.Show(String.Format("下载的升级文件有错误/n/n{0}", exp.Message), "自动升级", MessageBoxButtons.OK, MessageBoxIcon.Error);
            //}
            //catch (NotSupportedException exp)
            //{
            //    MessageBox.Show(String.Format("升级地址配置错误/n/n{0}", exp.Message), "自动升级", MessageBoxButtons.OK, MessageBoxIcon.Error);
            //}
            //catch (ArgumentException exp)
            //{
            //    MessageBox.Show(String.Format("下载的升级文件有错误/n/n{0}", exp.Message), "自动升级", MessageBoxButtons.OK, MessageBoxIcon.Error);
            //}
            //catch (Exception exp)
            //{
            //    MessageBox.Show(String.Format("升级过程中发生错误/n/n{0}", exp.Message), "自动升级", MessageBoxButtons.OK, MessageBoxIcon.Error);
            //}
            catch (Exception ex)
            { throw ex; }
            finally { m_isFinished = true; }
        }

        #endregion

        #region DownLoadFileInfo

        public class DownLoadFileInfo
        {
            /// <summary>
            /// 文件标识
            /// </summary>
            public string fileID = null;
            /// <summary>
            /// 文件名（不包括路径）
            /// </summary>
            public string fileName = null;
            /// <summary>
            /// 文件WEB地址
            /// </summary>
            public string fileWebUrl = null;
            /// <summary>
            /// 文件保存到本地的路径
            /// </summary>
            public string fileSavePath = null;
        }

        #endregion

    }
}

 

WebService提供方法

[WebMethod]

public string GetUpdataConfig()

{

    string file = Server.MapPath("//UpdateFiles//UpdateConfig.xml");

    XmlDocument xd = new XmlDocument();

    xd.Load(file);

    return xd.InnerXml;

}

 

UpdateConfig.xml内容：

 

<?xml version="1.0" encoding="utf-8"?>
<updateFiles>
  <file FileID="CA80EA43-391F-434E-A7F7-4FC96FA50163" FileInfo="UI-1.dll"  FileName="UI-0901091.dll"  Url="http://127.0.0.1/WebSrvTest/UpdateFiles/UI-0901091.rar" SavePath="test/tmp/" Version="1.0.0.1" Size="26009" Restart="true" />
  <file FileID="EB544DEC-2A1D-4413-B7EB-7E306EF3A20E" FileInfo="UI-2.dll"  FileName="UI-0901092.dll"  Url="http://127.0.0.0/WebSrvTest/UpdateFiles/UI-0901092.rar" SavePath="test/tmp/" Version="1.0.0.2" Size="26009" Restart="true" />
</updateFiles>