1.aspx
<asp:FileUpload ID="FileUpload1" runat="server" /><asp:Label ID="lblImg" runat="server" Text=""></asp:Label>
2.cs
public void getDataImg() ???????{ ???????????Boolean fileOK = false; ???????????//获取上传的文件名 ?????????????string fileName = this.FileUpload1.FileName; ???????????//获取物理路径 ?????????????String path = Server.MapPath("~/upload/"); ???????????//获取文件的类型 ???????????string Extension = Path.GetExtension(FileUpload1.PostedFile.FileName); ???????????//判断上传控件是否上传文件 ?????????????if (FileUpload1.HasFile) ???????????{ ???????????????//判断上传文件的扩展名是否为允许的扩展名".gif", ".png", ".jpeg", ".jpg" ,".bmp" ?????????????????String fileExtension = Path.GetExtension(fileName).ToLower(); ???????????????String[] Extensions = { ".gif", ".png", ".jpeg", ".jpg", ".bmp", ".JPG" }; ???????????????for (int i = 0; i < Extensions.Length; i++) ???????????????{ ???????????????????if (fileExtension == Extensions[i]) ???????????????????{ ???????????????????????fileOK = true; ???????????????????} ???????????????} ???????????} ???????????//如果上传文件扩展名为允许的扩展名，则将文件保存在服务器上指定的目录中 ?????????????if (fileOK) ???????????{ ???????????????try ???????????????{ ???????????????????string NewFilePath = DateTime.Now.ToString("yyyyMMddHHmmssffff") + Extension; ?//重命名图片，也可以用图片原有的名字 ???????????????????this.FileUpload1.PostedFile.SaveAs(path + NewFilePath); ???????????????????//string ImgPath = "../upload/" + NewFilePath; ?//获取上传好的图片的路径 ???????????????????//将字符串存入数据库对应的字段即可 ???????????????????lblImg.Text = "../upload/" + NewFilePath; ???????????????} ???????????????catch (Exception ex) ???????????????{ ???????????????????//MessageBox("文件不能上传，原因：" + ex.Message); ???????????????????Response.Write("<script> alert(‘文件不能上传，原因：" + ex.Message + "‘);window.location.href=window.location.href; </script> "); ???????????????} ???????????} ???????????else ???????????{ ???????????????//MessageBox("不能上传这种类型的文件1"); ???????????} ???????} ???????上传图片
原文地址：http://www.cnblogs.com/huichao1314/p/7661394.html