?private void btnDown_Click(object sender, EventArgs e) ???

???? { ??????????

? DownloadFile("http://localhost:1928/WebServer/downloader/123.rar", @"C:\123.rar", progressBar1, label1); ??

????? } ???

???? /// <summary>??????? ??

????? /// c#,.net 下載文件??????

? ??????? /// </summary>???????

??????? /// <param name="URL">下載文件地址</param>????

?? ??????? /// ???

???? /// <param name="Filename">下載后的存放地址</param>??????? ?

?????? /// <param name="Prog">用于顯示的進度條</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 = "當前補丁下載進度" + percent.ToString() + "%"; ????

??????????????? System.Windows.Forms.Application.DoEvents();

//必須加注這句代碼，否則label1將因為循環執行太快而來不及顯示信息 ?????

?????????? }

??????????????? so.Close(); ?????

?????????? st.Close(); ??????

????? } ??????????

? catch (System.Exception) ??????????

? { ????????????

??? throw;

??????????? } ????

??? }

轉載于:https://www.cnblogs.com/zhangruisoldier/p/4905208.html

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