C# Winform下载文件并显示进度条

本来是要研究怎样判断下载完成,结果找到这个方法,可以在这个方法完成之后提示下载完成。

代码如下:
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;

namespace WinShowDown
{
    
public partial class FrmMain : Form
    {
        
public FrmMain()
        {
            InitializeComponent();
        }

        
private void btnDown_Click(object sender, EventArgs e)
        {
            DownloadFile(
"http://localhost:1928/WebServer/downloader/123.rar"@"C:\123.rar", progressBar1, label1);
        }
        
/// <summary>        
        
/// c#,.net 下载文件        
        
/// </summary>        
        
/// <param name="URL">下载文件地址</param>       
        
/// 
        
/// <param name="Filename">下载后的存放地址</param>        
        
/// <param name="Prog">用于显示的进度条</param>        
        
/// 
        public void DownloadFile(string URL, string filename, System.Windows.Forms.ProgressBar prog, System.Windows.Forms.Label label1)
        {
            
float percent = 0;
            
try
            {
                System.Net.HttpWebRequest Myrq 
= (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(URL);
                System.Net.HttpWebResponse myrp 
= (System.Net.HttpWebResponse)Myrq.GetResponse();
                
long totalBytes = myrp.ContentLength;
                
if (prog != null)
                {
                    prog.Maximum 
= (int)totalBytes;
                }
                System.IO.Stream st 
= myrp.GetResponseStream();
                System.IO.Stream so 
= new System.IO.FileStream(filename, System.IO.FileMode.Create);
                
long totalDownloadedByte = 0;
                
byte[] by = new byte[1024];
                
int osize = st.Read(by, 0, (int)by.Length);
                
while (osize > 0)
                {
                    totalDownloadedByte 
= osize + totalDownloadedByte;
                    System.Windows.Forms.Application.DoEvents();
                    so.Write(by, 
0, osize);
                    
if (prog != null)
                    {
                        prog.Value 
= (int)totalDownloadedByte;
                    }
                    osize 
= st.Read(by, 0, (int)by.Length);

                    percent 
= (float)totalDownloadedByte / (float)totalBytes * 100;
                    label1.Text 
= "当前补丁下载进度" + percent.ToString() + "%";
                    System.Windows.Forms.Application.DoEvents(); 
//必须加注这句代码,否则label1将因为循环执行太快而来不及显示信息
                }
                so.Close();
                st.Close();
            }
            
catch (System.Exception)
            {
                
throw;
            }
        }
    }
}
源码下载:http://revit.5d6d.com/thread-997-1-1.html  
posted @ 2011-05-17 18:06  大气象  阅读(...)  评论(... 编辑 收藏
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