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asp.net 生成图片验证码
identifyingcode.aspx里没有内容略。
identifyingcode.cs文件：
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;
using system.drawing;
using system.drawing.imaging;
using system.io;
public partial class identifyingcode : system.web.ui.page
{
protected void page_load(object sender, eventargs e)
{
string tmp = rndnum(4);
httpcookie a = new httpcookie("imagev", tmp);
response.cookies.add(a);
this.validatecode(tmp);
}
private void validatecode(string vnum)
{
bitmap img = null;
graphics g = null;
memorystream ms = null;
int gheight = vnum.length * 12;
img = new bitmap(gheight, 25);
g = graphics.fromimage(img);
//背景颜色
g.clear(color.lightsteelblue);
//文字字体
font f = new font("arial black", 10);
//文字颜色
solidbrush s = new solidbrush(color.royalblue);
g.drawstring(vnum, f, s, 3, 3);
ms = new memorystream();
img.save(ms, imageformat.jpeg);
response.clearcontent();
response.contenttype = "images/jpeg";
response.binarywrite(ms.toarray());
g.dispose();
img.dispose();
response.end();
}
private string rndnum(int vcodenum)
{
string vchar = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p" +
",q,r,s,t,u,v,w,x,y,z";
string[] vcarray = vchar.split(new char[] { ',' });
string vnum = "";
int temp = -1;
random rand = new random();
for (int i = 1; i < vcodenum + 1; i++)
{
