C# 下载服务器的文件

C# 下载服务器的文件方法，带下载进度条。

来源：C#下载文件并显示显示进度的方法实现_光脚丫思考的专栏-CSDN博客

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;
        labelProg.Content = "当前下载进度" + 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
    }

    labelProg.Content = "下载完成";

    so.Close();
    st.Close();
}
catch (System.Exception ex)
{
    label1.Content = ex.ToString();
    throw;
}