C#下载文件代码更新20070920

最新推荐文章于 2021-04-27 09:51:33 发布

最新推荐文章于 2021-04-27 09:51:33 发布 · 79 阅读

本文提供了一个使用C#实现的文件下载示例代码。通过该示例，读者可以了解到如何利用HttpWebRequest从指定URL下载文件到本地路径，并通过状态栏实时显示下载进度。

引用空间:

using System.IO;
using System.Text;
using System.Net;

按钮事件:

private void button5_Click(object sender, System.EventArgs e)
{
string DownloadUrl="http://update.cz88.net/soft/qqwry.rar";

string LocalPath=Application.StartupPath.ToString()+"//"+"qqwry"+DateTime.Now.ToShortDateString()+".rar";

if(downfile(DownloadUrl,LocalPath))
{
MessageBox.Show("下载完成");
}
else
{
MessageBox.Show("下载过程中出现错误:");
}

}

下载函数:
public bool downfile(string url,string LocalPath)
{
try
{
Uri u = new Uri(url);
HttpWebRequest mRequest = (HttpWebRequest)WebRequest.Create(u);
mRequest.Method = "GET";
mRequest.ContentType = "application/x-www-form-urlencoded";
HttpWebResponse wr = (HttpWebResponse)mRequest.GetResponse();
statusBar1.Text = "开始下载文件...";
Stream sIn = wr.GetResponseStream();
FileStream fs = new FileStream(LocalPath, FileMode.Create, FileAccess.Write);
long length = wr.ContentLength;
int i = 0;
long j=0;
statusBar1.Text = "正在接收数据...";
byte[] buffer = new byte[1024];
while ((i = sIn.Read(buffer, 0, buffer.Length)) > 0)
{
j+=i;
fs.Write(buffer, 0,i);
statusBar1.Text="文件大小:"+length.ToString()+"字节当前下载:"+j+"字节";

}