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在Web开发中会经常使用到个人信息注册，而个人信息中通常需要自己的头像或者照片。今天主要介绍一下使用FileUpload+img控件上传照片。 FileUpLoad控件使用介绍FileUpLoad控件的PostedFile属性主要获取上传文件的一些基础信息。 .ContentLength获取上传文件的大小。返回值为int类型，单位为字节。 用途 1、判断上传文件的大小 if (this.FileUpload1.PostedFile.ContentLength <= 4000000) //4M { Response.Write("<script>alert('" +FileUpload1.PostedFile.ContentLength + "')</script>"); } else { Response.Write("<script>alert('太大了不能上传！')</script>"); } 其中FileUpload1是上传控件的ID，this.FileUpload1.PostedFile.ContentLength是上传文件的大小 2、修改ASP.NET上传的默认值 ASP.NET的默认最大上传值是4M，通过修改web.config，可以实现上传大文件： <system.web> <httpRuntime maxRequestLength="4096"//这里的4096就是4m，原先是默认的。你改一下这个，就可以了。 executionTimeout="3600" /> </system.web>
.ContentType获取上传文件的MIME内容类型。PostedFile.ContentType这个属性通常用来判断上传文件的MIME类型，我们通常以此来拒绝某些类型的上传，比如仅允许上传图像文件，或者指定固定图片的格式。 在net，做上传文件判断文件格式的写法总结： ".*"="application/octet-stream" ".001"="application/x-001" ".301"="application/x-301" ".323"="text/h323" ".906"="application/x-906" ".907"="drawing/907" ".a11"="application/x-a11" ".acp"="audio/x-mei-aac" ".ai"="application/postscript" ".aif"="audio/aiff" ".aifc"="audio/aiff" ".aiff"="audio/aiff" ".anv"="application/x-anv" ".asa"="text/asa" ".asf"="video/x-ms-asf" ".asp"="text/asp" ".asx"="video/x-ms-asf" ".au"="audio/basic" ".avi"="video/avi" ".awf"="application/vnd.adobe.workflow" ".biz"="text/xml" ".bmp"="application/x-bmp" ".bot"="application/x-bot" ".c4t"="application/x-c4t" ".c90"="application/x-c90" ".cal"="application/x-cals" ".cat"="application/vnd.ms-pki.seccat" ".cdf"="application/x-netcdf" ".cdr"="application/x-cdr" ".cel"="application/x-cel" ".cer"="application/x-x509-ca-cert" ".cg4"="application/x-g4" ".cgm"="application/x-cgm" ".cit"="application/x-cit" ".class"="java/*" ".cml"="text/xml" ".cmp"="application/x-cmp" ".cmx"="application/x-cmx" ".cot"="application/x-cot" ".crl"="application/pkix-crl" ".crt"="application/x-x509-ca-cert" ".csi"="application/x-csi" ".css"="text/css" ".cut"="application/x-cut" ".dbf"="application/x-dbf" ".dbm"="application/x-dbm" ".dbx"="application/x-dbx" ".dcd"="text/xml" ".dcx"="application/x-dcx" ".der"="application/x-x509-ca-cert" ".dgn"="application/x-dgn" ".dib"="application/x-dib" ".dll"="application/x-msdownload" ".doc"="application/msword" ".dot"="application/msword" ".drw"="application/x-drw" ".dtd"="text/xml" ".dwf"="Model/vnd.dwf" ".dwf"="application/x-dwf" ".dwg"="application/x-dwg" ".dxb"="application/x-dxb" ".dxf"="application/x-dxf" ".edn"="application/vnd.adobe.edn" ".emf"="application/x-emf" ".eml"="message/rfc822" ".ent"="text/xml" ".epi"="application/x-epi" ".eps"="application/x-ps" ".eps"="application/postscript" ".etd"="application/x-ebx" ".exe"="application/x-msdownload" ".fax"="image/fax" ".fdf"="application/vnd.fdf" ".fif"="application/fractals" ".fo"="text/xml" ".frm"="application/x-frm" ".g4"="application/x-g4" ".gbr"="application/x-gbr" ".gcd"="application/x-gcd" ".gif"="image/gif" ".gl2"="application/x-gl2" ".gp4"="application/x-gp4" ".hgl"="application/x-hgl" ".hmr"="application/x-hmr" ".hpg"="application/x-hpgl" ".hpl"="application/x-hpl" ".hqx"="application/mac-binhex40" ".hrf"="application/x-hrf" ".hta"="application/hta" ".htc"="text/x-component" ".htm"="text/html" ".html"="text/html" ".htt"="text/webviewhtml" ".htx"="text/html" ".icb"="application/x-icb" ".ico"="image/x-icon" ".ico"="application/x-ico" ".iff"="application/x-iff" ".ig4"="application/x-g4" ".igs"="application/x-igs" ".iii"="application/x-iphone" ".img"="application/x-img" ".ins"="application/x-internet-signup" ".isp"="application/x-internet-signup" ".IVF"="video/x-ivf" ".java"="java/*" ".jfif"="image/jpeg" ".jpe"="image/jpeg" ".jpe"="application/x-jpe" ".jpeg"="image/jpeg" ".jpg"="application/x-jpg" ".js"="application/x-javascript" ".jsp"="text/html" ".la1"="audio/x-liquid-file" ".lar"="application/x-laplayer-reg" ".latex"="application/x-latex" ".lavs"="audio/x-liquid-secure" ".lbm"="application/x-lbm" ".lmsff"="audio/x-la-lms" ".ls"="application/x-javascript" ".ltr"="application/x-ltr" .FileName获取上传文件的完整路径及名称。此路径为改文件所在在客户端文件中的路径。通常用这个属性来获取上传文件的名称并保保存。 .FileUpload1.SaveAs将上传文件保存到指定路径的文件下。通常借助Server.MapPath（）方法保存文件到服务器指定文件下。（获取Web服务器指定虚拟路径相对应的物理文件路径） 图片上传实例FileUpload+Image控件实现上传指定图片大小、格式、保存到指定路径文件下。 .axps
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Fileup.aspx.cs" Inherits="Testcookie.Fileup" %>
<!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></title>
</head>
<body>
<form >
<div>
<asp:Image ID="Image1" runat="server" Height="180px" Width="191px" ImageUrl="~/Photo/untitled.png" />
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnupload" runat="server" Text="Button" onclick="btnupload_Click" />
<asp:Button ID="btndelete" runat="server" Text="Button" onclick="btndelete_Click" />
</div>
</form>
</body>
</html>
.axps.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Testcookie
{
public partial class Fileup : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnupload_Click(object sender, EventArgs e)
{
int length= this.FileUpload1.PostedFile.ContentLength;//获取图片大小，以字节为单位
if(length<4000)
{
Response.Write("<script language='javascript'>alert('您选择的图片过大！');</script>");
}
else{
String type=this.FileUpload1.PostedFile.ContentType;//获取上传文件类型
String fullfilename = this.FileUpload1.PostedFile.FileName;//获取上传文件在客户端的路径及名称
String filename = fullfilename.Substring(fullfilename.LastIndexOf("\\")+1);
String extensions = filename.Substring(filename.LastIndexOf (".")+1);//获取文件扩展名
string name=DateTime.Now.ToString("yyyyMMddHHmmss");
if (type == "image/jpeg" || type == "image/png" )//限制上传格式
{
this.FileUpload1.SaveAs(Server.MapPath("Photo") + "\\" + name + "." + extensions);//将图片以当前时间命名保存，避免上传图片命名重复
//设置上传图片大小为原图片大小
//System.Drawing.Image img = System.Drawing.Image.FromFile(this.Server.MapPath("Photo") + "\\" + name + "." + extensions);//获得图片文件
//int width = img.Width;
//this.Image1.Width = width;//这是宽设置Image控件的宽度为图片宽度
//int height = img.Height;
//this.Image1.Height = height;//这是高，设置Image控件的高度为图片的高度
this.Image1.ImageUrl = "Photo/" + name + "." + extensions;
}
else
{
Response.Write("<script language='javascript'>alert('您选择的图片有误！');</script>");
}
}
}
protected void btndelete_Click (object sender, EventArgs e)
{
//删除图片
if (System.IO.File.Exists(Server.MapPath("Photo")+"\\20130808084433.PNG"))
{
try
{
System.IO.File.Delete(Server.MapPath("Photo") + "\\20130808084433.PNG");
}
catch
{
throw new Exception("文件删除失败！");
}
}
}
}
}
效果 文件上传前
文件上传后
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