文件名：<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <asp:Image ID="Image1" runat="server" /> <br/> <input type="file" name="f1" id="f1"> <asp:Button ID="Button1" runat="server" Text="Button" οnclick="Button1_Click" OnClientClick="return exisitExit()" /><script> function exisitExit() { var f1 = document.getElementById("f1"); var ext= f1.value.substring(f1.value.lastIndexOf(".")); if (ext == ".jpg" || ext == ".jpeg" || ext == ".gif") { return true; } else { alert("文件类型不符合人要求"); return false; } } </script>OnClientClick是客户端脚本，一般使用javascript，在客户端，也就是IE中运行，点击后马上执行
protected void Button1_Click(object sender, EventArgs e) { //路径 文件名 扩展名 要求的存储格式~数组 HttpPostedFile hf = Request.Files["f1"]; string filename = hf.FileName;//全路径：F:\asp\456.jpg :FileName要上传的文件所在地 string Imgname = Path.GetFileName(filename);//文件名：456 string ext = Path.GetExtension(Imgname).ToLower();//获取拓展名:.jpg Response.Write(Imgname + "<br/>" + ext); string[] exts = {".jpg",".jpeg",".png",".bmp",".gif" }; bool tag = false; foreach (string item in exts) { if (item == ext) { tag = true; break; } } if(tag) //扩展名符合要求，upload 自定义日期(dir) dirpath SaveAS(durpath+imgname) { if (hf.ContentLength < 1024 ) { string uppath="upload/"; string dir = DateTime.Now.Year + "/" + DateTime.Now.Month + "/" + DateTime.Now.Day; string dirpath = Server.MapPath(uppath + dir); if (!Directory.Exists(dirpath)) { Directory.CreateDirectory(dirpath); } if (TextBox1.Text != "") { Imgname = TextBox1.Text + ext; } hf.SaveAs(dirpath + Imgname); Image1.ImageUrl = uppath + dir + Imgname; Image1.Width = 400; Image1.Height = 300; } else { Response.Write("<script>alert('上传文件太大')</script>"); } } else { Response.Write("<script>alert('文件格式不对')</script>"); } }
转载于:https://www.cnblogs.com/ZkbFighting/p/8143228.html
相关资源：数据结构—成绩单生成器