VS2005/2008出錯判斷-生成驗證碼

1,

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Microsoft Visual Studio

無法打開項目檔案“C:\Documents and Settings\Administrator\Local Settings\Temp\5plaia1i.o42\Temp\WpfApplication1.csproj”。

此安裝不支援該項目類型。

确定   幫助  

2,

c#設計視圖不能用

3,

在建立一個silverlight application時，總是報錯：

無法打開項目檔案“c:\Documents and settings \Administrator\localsettings\Temp\silverlightApplication.csproj”

此安裝不支援該項目類型

上面三個問題的解決辦法：

開始菜單–>Microsoft Visual Studio 2008–>Visual Studio Tools->Visual Studio 2008 Command Prompt(指令提示符)

運作： devenv /ResetSkipPkgs

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引用命名空間 using System.Drawing;

産生随機字元串

    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' };//枚舉數組

        string num = "";

        Random r = new Random();

        for (int i = 0; i < 5; i++)

        {

            num += s[r.Next(0, s.Length)].ToString();

        }

        return num;

    }

産生圖檔

    private void CreateCheckCodeImage(string checkCode)

    { //将驗證碼生成圖檔顯示

        if (checkCode == null || checkCode.Trim() == String.Empty)

            return;

        System.Drawing.Bitmap p_w_picpath = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);

        Graphics g = Graphics.FromImage(p_w_picpath);

        //生成随機生成器

        Random random = new Random();

        //清空圖檔背景色

        g.Clear(Color.White);

        //畫圖檔的背景噪音線

        for (int i = 0; i < 25; i++)

            int x1 = random.Next(p_w_picpath.Width);

            int x2 = random.Next(p_w_picpath.Width);

            int y1 = random.Next(p_w_picpath.Height);

            int y2 = random.Next(p_w_picpath.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, p_w_picpath.Width, p_w_picpath.Height), Color.Blue, Color.DarkRed, 1.2f, true);

        g.DrawString(checkCode, font, brush, 2, 2);

        //畫圖檔的前景噪音點

        for (int i = 0; i < 100; i++)

            int x = random.Next(p_w_picpath.Width);

            int y = random.Next(p_w_picpath.Height);

            p_w_picpath.SetPixel(x, y, Color.FromArgb(random.Next()));

        //畫圖檔的邊框線

        g.DrawRectangle(new Pen(Color.Silver), 0, 0, p_w_picpath.Width - 1, p_w_picpath.Height - 1);

        System.IO.MemoryStream ms = new System.IO.MemoryStream();

        p_w_picpath.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);

        Response.ClearContent();

        Response.ContentType = "p_w_picpath/Gif";

        Response.BinaryWrite(ms.ToArray());

用這兩個函數放在一個GetValCode.aspx裡面,用一個session["curValCode"]儲存随機字元串：

    protected void Page_Load(object sender, EventArgs e)

        string valCode = MakeValidateCode();

        Session["curValCode"] = valCode;

        CreateCheckCodeImage(valCode);

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

在Register.aspx裡用session["curValCode"]來檢查