在做WIN FORM程序中經常要使用到升級功能，就需要從服務器上下載最新扔軟件程序。如何下載呢？代碼實現如下：

??????? ///?<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;
???????????? }
???????? }

?

http://www.cnblogs.com/Slxj/archive/2011/08/21/2147672.html

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