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asp.net mvc项目使用到验证码，为了让以前的webform代码能利用上代码经过稍微的改动即可使用代码如下：
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using system;
using system.collections.generic;
using system.web;
using system.web.mvc;
using system.web.ui;
using system.web.ui.webcontrols;
using system.drawing;
namespace angel.web.controllers
{
public class checkcodecontroller : controller
{
//
// get: /checkcode/
public actionresult index()
{
this.createcheckcodeimage(generatecheckcode());
return view();
}
private string generatecheckcode()
{
int number;
char code;
string checkcode = string.empty;
system.random random = new random();
for (int i = 0; i < 5; i++)
{
number = random.next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('a' + (char)(number % 26));
if (code == '0' || code == 'o' || code == 'l' || code == 'i')
{
i = i - 1;
}
else
{
checkcode += code.tostring();
}
}
// response.cookies.add(new httpcookie("checkcode", checkcode));
session.contents["checkcode"] = checkcode;
return checkcode;
}
private void createcheckcodeimage(string checkcode)
{
if (checkcode == null || checkcode.trim() == string.empty)
return;
system.drawing.bitmap image = new system.drawing.bitmap((int)math.ceiling((checkcode.length * 12.5)), 22);
graphics g = graphics.fromimage(image);
try
{
//生成随机生成器
random random = new random();
//清空图片背景色
g.clear(color.white);
//画图片的背景噪音线
for (int i = 0; i < 25; i++)
{
int x1 = random.next(image.width);
int x2 = random.next(image.width);
int y1 = random.next(image.height);
int y2 = random.next(image.height);
g.drawline(new pen(color.silver), x1, y1, x2, y2);
}
font font = new system.drawing.font("arial", 12, (system.drawing.fontstyle.bold | system.drawing.fontstyle.italic));
system.drawing.drawing2d.lineargradientbrush brush = new system.drawing.drawing2d.lineargradientbrush(new rectangle(0, 0, image.width, image.height), color.blue, color.darkred, 1.2f, true);
g.drawstring(checkcode, font, brush, 2, 2);
//画图片的前景噪音点
for (int i = 0; i < 100; i++)
{
int x = random.next(image.width);
int y = random.next(image.height);
image.setpixel(x, y, color.fromargb(random.next()));
}
//画图片的边框线
g.drawrectangle(new pen(color.silver), 0, 0, image.width - 1, image.height - 1);
system.io.memorystream ms = new system.io.memorystream();
image.save(ms, system.drawing.imaging.imageformat.gif);
response.clearcontent();
response.contenttype = "image/gif";
response.binarywrite(ms.toarray());
}
finally
{
g.dispose();
image.dispose();
}
}
}
}
最后别忘了session的获取设置，需要在global.asax.cs文件中新增如下代码：
/// <summary>
/// mvc为了获取session参数
/// </summary>
public override void init()
{
postauthenticaterequest += (s, e) => httpcontext.current.setsessionstatebehavior(sessionstatebehavior.required);
base.init();
}
void mvcapplication_postauthenticaterequest(object sender, eventargs e)
{
httpcontext.current.setsessionstatebehavior(sessionstatebehavior.required);
}
html页面代码：
html代码
<img name="img1" id="img1" style="position:absolute;top:5px;right:36px!important;z-index:1000;" alt="单击图片刷新验证码" src="checkcode/index" <br>onclick="javasccript:reloadimage('checkcode/index');" /><br><script type="text/javascript">
function reloadimage(url) {
document.getelementbyid("img1").src = url + '?abc=' + math.random();
}
</script>
总结
以上所述是小编给大家介绍的asp.net mvc 在controller控制器中实现验证码输出功能，希望对大家有所帮助
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