c#文件拥有自己的文件上传控件FileUpload。
使用FIieUpload控件上传文件：
前台代码：
<body> <form id="form1" runat="server"> <div> <asp:FileUpload ID="FileUpload1" runat="server" /> <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" /> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> </div> </form> </body>
protected void Button1_Click(object sender, EventArgs e) { bool filesValid = false; if (this.FileUpload1.HasFile) { //获取上传文件的后缀 String fileExtension = System.IO.Path.GetExtension(this.FileUpload1.FileName).ToLower(); String[] restrictExtension = {".gif", ".jpg", ".bmp", ".png"}; //判断文件类型是否符合要求 for (int i = 0; i < restrictExtension.Length; i++) { if (fileExtension == restrictExtension[i]) filesValid = true; } //如果文件类型符合要求，调用SaveAs方法实现上传，并显示相关信息 if (filesValid == true) { try { this.Image1.ImageUrl = "~/images" + FileUpload1.FileName; this.FileUpload1.SaveAs(Server.MapPath("~/images/") + FileUpload1.FileName); this.Label1.Text = "文件上传成功"; this.Label1.Text += "<br/>"; this.Label1.Text += "<li>" + "原文件路径:" + this.FileUpload1.PostedFile.FileName; this.Label1.Text += "<br/>"; this.Label1.Text += "<li>" + "文件大小:" + this.FileUpload1.PostedFile.ContentLength + "字节"; this.Label1.Text += "<br/>"; this.Label1.Text += "<li>" + "文件类型:" + this.FileUpload1.PostedFile.ContentType; } catch { this.Label1.Text = "文件上传不成功!"; } } else { this.Label1.Text = "文件类型不正确!"; } } }