生成驗證碼

生成驗證碼的類：

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.drawing2d;

public partial class yanzheng : system.web.ui.page

/// /// 生成隨機校驗碼字串

/// /// ///

/// 生成的隨機校驗碼字串

public string generatecheckcode()

//    else

//   

//    strcode += ((char)number).tostring();

//}在cookie中儲存校驗碼或session中

}/// /// 根據校驗碼輸出

/// ///

/// 產生的隨機校驗碼

public void createcheckcodeimage(string checkcode)

//根據校驗碼的長度確定輸出的長度

system.drawing.bitmap image = new system.drawing.bitmap((int)math.ceiling(decimal.parse((checkcode.length * 15) + "")), 20);

//建立ｇｒａｐｈｉｃｓ物件

system.drawing.graphics g = system.drawing.graphics.fromimage(image);

try//輸出中校驗碼的字型：１２號arial,粗斜體

system.drawing.font font = new system.drawing.font("arial", 12, (system.drawing.fontstyle.bold | system.drawing.fontstyle.italic));

//線形漸變畫刷

system.drawing.drawing2d.lineargradientbrush brush = new system.drawing.drawing2d.lineargradientbrush(new system.drawing.rectangle(0, 0, image.width, image.height), system.drawing.color.blue, system.drawing.color.purple, 1.2f, true);

g.drawstring(checkcode, font, brush, 2, 3);

//畫的前景噪音點５０個

for (int i = 0; i < 50; i++)

//畫的邊框線

g.drawrectangle(new system.drawing.pen(system.drawing.color.saddlebrown), 0, 0, image.width - 1, image.height - 1);

//建立記憶體流用於輸出

using (system.io.memorystream ms = new system.io.memorystream())

}finally}}

前端**：

function show()

驗證輸入是否正確：

//判斷驗證碼輸入是否正確(不區分大小寫)

public static bool check(string input, string yanzheng)

else}}

return flag;}}

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