前台
<html xmlns="/1999/xhtml"><head runat="server"><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title></title></head><body><form runat="server" id="form1" method="post" enctype="multipart/form-data"><input name="f" type="file" /><input name="s" type="submit" /></form></body></html>
后台
System.Web.HttpFileCollection _file = System.Web.HttpContext.Current.Request.Files;if (_file.Count > 0){//文件大小long size = _file[0].ContentLength;//文件类型string type = _file[0].ContentType;//文件名string name = _file[0].FileName;//文件格式string _tp = System.IO.Path.GetExtension(name);if (_tp.ToLower() == ".jpg" || _tp.ToLower() == ".jpeg" || _tp.ToLower() == ".gif" || _tp.ToLower() == ".png" || _tp.ToLower() == ".swf"){//获取文件流System.IO.Stream stream = _file[0].InputStream;//保存文件string saveName = DateTime.Now.ToString("yyyyMMddHHmmss") + _tp;string path = DataFactory.WFile.FileUploadPath + "/upload/area/" + saveName;// string path = Server.MapPath("images/"+savename);自己编写_file[0].SaveAs(path);}}
总结：
1.form 必须有runat="server"标记，
2.form 必须有enctype="multipart/form-data"标记，
3.<input type="file" />的runat="server"标记可选
完！
