asp.net中ashx生成验证码代码放在Linux(centos)主机上访问时无法显示问题

最近有个项目加入了验证码功能，就从自己博客以前的代码中找到直接使用，直接访问验证码页面报错如下：

源代码：asp.net中使用一般处理程序生成验证码

Application Exception

System.ArgumentException

The requested FontFamily could not be found [GDI+ status: FontFamilyNotFound]

Description: HTTP 500.Error processing request.

Details: Non-web exception. Exception origin (name of application or object): System.Drawing.

Exception stack trace:

  at System.Drawing.GDIPlus.CheckStatus (Status status) [0x00000] in <filename unknown>:0

  at System.Drawing.FontFamily..ctor (GenericFontFamilies genericFamily) [0x00000] in <filename unknown>:0

  at (wrapper remoting-invoke-with-check) System.Drawing.FontFamily:.ctor (System.Drawing.Text.GenericFontFamilies)

  at System.Drawing.FontFamily.get_GenericMonospace () [0x00000] in <filename unknown>:0

  at EnterpriseShow.UI.Manager.AjaxHandle.ValidCode.ProcessRequest (System.Web.HttpContext context) [0x00000] in <filename unknown>:0

  at System.Web.HttpApplication+<Pipeline>c__Iterator1.MoveNext () [0x00000] in <filename unknown>:0

  at System.Web.HttpApplication.Tick () [0x00000] in <filename unknown>:0 

1、首先从window上copy字体安装到centos中

安装字体方法如下：本段文字来自唧唧的博客

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2、安装完毕后，我们在代码中指定要使用的字体

context.Response.ContentType = "image/gif";

            Bitmap basemap = new Bitmap(200, 60);

            Graphics garph1 = Graphics.FromImage(basemap);

garph1.FillRectangle(new SolidBrush(Color.White), 0, 0, 200, 60);

            Font font = new Font("consola.ttf", 48, FontStyle.Bold, GraphicsUnit.Pixel);
Random r = new Random();

            string letters = "ABCDEFGHIJKLMNPQRSTUVWXYZ";

            string letter;

            StringBuilder s = new StringBuilder();

            for (int i = 0; i < 5; i++)

            {

                letter = letters.Substring(r.Next(0, letters.Length - 1), 1);

                s.Append(letter);

                garph1.DrawString(letter, font, new SolidBrush(Color.Black), i * 38, r.Next(0, 15));
}
Pen linePen = new Pen(new SolidBrush(Color.Black), 2);

            for (int x = 0; x < 6; x++)

            {

                garph1.DrawLine(linePen, new Point(r.Next(0, 199), r.Next(0, 59)), new Point(r.Next(0, 199), r.Next(0, 59)));

            }
basemap.Save(context.Response.OutputStream, ImageFormat.Gif);

            context.Session["CheckCode"] = s.ToString();    //存入Session，用于对比验证

            context.Response.End();

再次访问清晰可见啊

记录下来备忘。

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