<%@ Page Language="C#" AutoEventWireup="true" CodeFile="1.aspx.cs" Inherits="_1" %>
1.aspx
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>無標題頁</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /></div>
</form>
</body>
</html>
1.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected string rndfilename()
{ //隨機文件名
string RndStr,filename1;
Random rnd=new Random();
RndStr="0123456789abcdefghijklmnopqrstuvwxyz";//循環文件名的字母和數字
filename1=DateTime.Now.ToString("yyyyMMddhhmmss");
for(int i=1;i<=4;i++)
{//隨機數的位數
filename1 += RndStr[rnd.Next(0, 36)];
}
return filename1;
}
protected void Button1_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
string filetype;
int filesize;
filetype = FileUpload1.PostedFile.ContentType.ToLower();
if (filetype != "image/gif" && filetype != "image/pjpeg" && filetype != "image/x-png" && filetype != "image/bmp")
{
Response.Write("<script>alert('只允許上傳jpg,gif,png類型的圖片');history.go(-1)</script>");
}
else if (FileUpload1.PostedFile.ContentLength > 202400)
{
Response.Write("<script>alert('上傳文件的大小請控制在200KB以內');history.go(-1)</script>");
}
else
{
String savePath = Server.MapPath("Uploadfile/");
savePath += rndfilename();
savePath += FileUpload1.FileName;
FileUpload1.SaveAs(savePath);//保存文件
}
}
}
}
