C# download code with progress bar (ordinary progress bar)

<span style="font-size:14px;">     </span>
<pre name="code" class="csharp">
<span style="font-size:14px;">        
/// <summary>  
        /// 下载带进度条代码（普通进度条）  
        /// </summary>  
        /// <param name="URL">网址</param>  
        /// <param name="Filename">下载后文件名为</param>  
        /// <param name="Prog">报告进度的处理(第一个参数：总大小，第二个参数：当前进度)</param>  
        /// <returns>True/False是否下载成功</returns>  
        public static bool DownLoadFile(string URL, string Filename, Action<int, int> updateProgress = null)
        {
            Stream st = null;
            Stream so = null;
             System.Net.HttpWebRequest Myrq =null;
             System.Net.HttpWebResponse myrp = null;
            bool flag = false;
            try
            {
                Myrq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(URL); //从URL地址得到一个WEB请求     
                myrp = (System.Net.HttpWebResponse)Myrq.GetResponse(); //从WEB请求得到WEB响应     
                long totalBytes = myrp.ContentLength; //从WEB响应得到总字节数
                //更新进度
                if (updateProgress != null)
                {
                    updateProgress((int)totalBytes,0);//从总字节数得到进度条的最大值  
                }
                st = myrp.GetResponseStream(); //从WEB请求创建流（读）     
                so = new System.IO.FileStream(Filename, System.IO.FileMode.Create); //创建文件流（写）     
                long totalDownloadedByte = 0; //下载文件大小     
                byte[] by = new byte[1024];
                int osize = st.Read(by, 0, (int)by.Length); //读流     
                while (osize > 0)
                {
                    totalDownloadedByte = osize + totalDownloadedByte; //更新文件大小     
                    Application.DoEvents();
                    so.Write(by, 0, osize); //写流     
                    //更新进度
                    if (updateProgress != null)
                    {
                        updateProgress((int)totalBytes, (int)totalDownloadedByte);//更新进度条 
                    }
                    osize = st.Read(by, 0, (int)by.Length); //读流     
                }
                //更新进度
                if (updateProgress != null)
                {
                    updateProgress((int)totalBytes, (int)totalBytes);
                }
                flag= true;
            }
            catch(Exception )
            {
                flag = false;
                throw;
                //return false;
            }
            finally
            {
                if (Myrq != null)
                {
                    Myrq.Abort();//销毁关闭连接
                }
                if (myrp != null)
                {
                    myrp.Close();//销毁关闭响应
                }
                if (so != null)
                {
                    so.Close(); //关闭流 
                }
                if (st != null)
                {
                    st.Close(); //关闭流  
                }
            }
            return flag;
        }</span>

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Calling method one:

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<span style="font-size:14px;"> if (FileUpDownload.DownLoadFile("下载文件的网址", "文件名", new Action<int, int>(
        (int Maximum, int Value)
        =>
        {
            //更新进度条
            progressBar1.Maximum = Maximum;
            progressBar1.Value = Value;
        })
))
{
	//下载文件后的处理
	
	
}</span>

<br/>

How to write action without passing parameters:

((Form)form).BeginInvoke(new Action(() =>
            {
                //处理
            })

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Calling method two:

<br/>

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<span style="font-size:14px;"> </span><pre name="code" class="csharp"><span style="font-size:14px;"> 
if (FileUpDownload.DownLoadFile("下载文件的网址", "文件名", UpdateProgressBar))
 {
	//下载文件后的处理
	
}
////更新进度条
private void UpdateProgressBar(int Maximum, int Value)
{
     progressBar1.Maximum = Maximum;
     progressBar1.Value = Value;
}</span>

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<br/>##

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Small note: progressBar1 in the calling code is Microsoft’s progress bar control

URL example: http:/ /www.php.cn/

If you want to download files on Windows Server, you need to configure it in iis. This directory is accessible. The specific configuration steps are as follows:

1. Find the directory corresponding to the file you need to download:

2. Find "Directory Browse" on the right:

3. Right-click on "Directory Browse" and click: Open this function

## 4. You can see the picture below and enable it:

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