VS2005/2008出错判断-生成验证码

1,

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Microsoft Visual Studio
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无法打开项目文件“C:/Documents and Settings/Administrator/Local Settings/Temp/5plaia1i.o42/Temp/WpfApplication1.csproj”。

此安装不支持该项目类型。
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确定   帮助  
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2,

c#设计视图不能用

 

 

3,

在创建一个silverlight application时，总是报错：
无法打开项目文件“c:/Documents and settings /Administrator/localsettings/Temp/silverlightApplication.csproj”
此安装不支持该项目类型

 

上面三个问题的解决办法：

开始菜单–>Microsoft Visual Studio 2008–>Visual Studio Tools->Visual Studio 2008 Command Prompt(命令提示符)
运行： devenv /ResetSkipPkgs

 

 

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引用命名空间 using System.Drawing;
产生随机字符串
    public string MakeValidateCode()
    {
        char[] s = new char[] { '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' };//枚举数组
        string num = "";
        Random r = new Random();
        for (int i = 0; i < 5; i++)
        {
            num += s[r.Next(0,s.Length)].ToString();
        }
        return num;
    }

产生图片

    private void CreateCheckCodeImage(string checkCode)
    { //将验证码生成图片显示
        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);
        //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,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),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());
    }

用这两个函数放在一个GetValCode.aspx里面,用一个session["curValCode"]保存随机字符串：

    protected void Page_Load(object sender,EventArgs e)
    {
        string valCode = MakeValidateCode();
        Session["curValCode"] = valCode;
        CreateCheckCodeImage(valCode);
    }

Register.aspx调用<img src="GetValCode.aspx" />

在Register.aspx里用session["curValCode"]来检查