using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;namespace VideoAddressResolution {class CHTTPDownload{/// <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;}}} }

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