最简单的图片上传显示代码（C#.net 2.0文件保存不会重名）
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="up.aspx.cs" Inherits="_Default" %>
<!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 id="Head1" runat="server">
<title>up</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Upload" OnClick="Button1_Click" /><br />
<asp:Label ID="Label1" runat="server"></asp:Label><br />
<asp:Image ID="Image1" runat="server" /></div>
</form>
</body>
</html>
////////////////////////////////////////////////////////////////////////////////////////////////////////////
using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
string fullname = FileUpload1.FileName.ToString();
string fn = DateTime.Now.ToString("yyyyMMddHHmmss") + fullname;
string typ2 = fullname.Substring(fullname.LastIndexOf(".")+1);
string size=FileUpload1.PostedFile.ContentLength.ToString();
if (typ2 == "gif" || typ2 == "jpg" || typ2 == "bmp" || typ2 == "png")
{
FileUpload1.SaveAs(Server.MapPath("up")+"\\"+fn); //将文件保存在跟目录的UP文件夹下
Label1.Text = (fn);
Image1.ImageUrl = (Server.MapPath("up") + "\\" + fn);
}
else
{
Label1.Text = "文件类型不支持";
}
}
}