上传图片

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.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 runat="server">
<title>上传图片</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnFileUpload" runat="server" Text="上传"
onclick="btnFileUpload_Click" />
</div>
</form>
</body>
</html>

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.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 runat="server">    <title>上传图片</title></head><body>    <form id="form1" runat="server">    <div>            <asp:FileUpload ID="FileUpload1" runat="server" />        <asp:Button ID="btnFileUpload" runat="server" Text="上传"             onclick="btnFileUpload_Click" />    </div>    </form></body></html>

Default.aspx.cs文档

C#代码

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnFileUpload_Click(object sender, EventArgs e)
{
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("~/Images/");
//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 = System.IO.Path.GetExtension(fileName).ToLower();
String[] Extensions = { ".gif",".png", ".jpeg",".jpg" ,".bmp"};
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
{
this.FileUpload1.PostedFile.SaveAs(path + fileName);
MessageBox( "文件上传完毕");
}
catch (Exception ex)
{
MessageBox("文件不能上传，原因：" + ex.Message);
}
}
else
{
MessageBox( "不能上传这种类型的文件");
}
}
protected void MessageBox(string str)
{
Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('"+str+"');</script>");
}
}