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【Asp.Net】 ASP.NET 验证码
作者:Dezai.CN / 发布于2011/7/7/ 715
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            <td class="content">"csharp comments"><font color="#008200">// 随机数生成器，使用静态变量</font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">private</font></strong> "csharp keyword"><strong><font color="#006699">static</font></strong> "csharp plain">Random rnd = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">Random();</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">protected</font></strong> "csharp keyword"><strong><font color="#006699">void</font></strong> "csharp plain">Page_Load("csharp keyword"><strong><font color="#006699">object</font></strong> "csharp plain">sender, EventArgs e)</td>
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            <td class="content">"csharp plain">{</td>
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            <td class="content">"csharp comments"><font color="#008200">// 验证码图片大小</font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">width = 60;</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">height = 20;</td>
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            <td class="content">"csharp comments"><font color="#008200">// 位图</font></td>
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            <td class="content">"csharp plain">Bitmap img = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">Bitmap(width, height);</td>
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            <td class="content">"csharp comments"><font color="#008200">// 画板</font></td>
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            <td class="content">"csharp plain">Graphics g = Graphics.FromImage(img);</td>
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            <td class="content">"csharp comments"><font color="#008200">// 单色画笔（画背景色，字符串）</font></td>
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            <td class="content">"csharp plain">Brush b;</td>
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            <td class="content">"csharp comments"><font color="#008200">// 初始化为背景色（红绿蓝都在200到250之间）</font></td>
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            <td class="content">"csharp plain">b = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">SolidBrush(Color.FromArgb(rnd.Next(200, 250), rnd.Next(200, 250), rnd.Next(200, 250)));</td>
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            <td class="content">"csharp comments"><font color="#008200">// 画背景</font></td>
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            <td class="content">"csharp plain">g.FillRectangle(b, 0, 0, width, height);</td>
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            <td class="content">"csharp comments"><font color="#008200">// 边框</font></td>
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            <td class="content">"csharp comments"><font color="#008200">// g.FillRectangle(b, 0, 0, width - 1, height - 1); </font></td>
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            <td class="content">"csharp comments"><font color="#008200">// 画笔（画直线或曲线）（红绿蓝都在160到200之间）</font></td>
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            <td class="content">"csharp plain">Pen p = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">Pen(Color.FromArgb(rnd.Next(160, 200), rnd.Next(160, 200), rnd.Next(160, 200)));</td>
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            <td class="content">"csharp comments"><font color="#008200">// 画干扰线</font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">for</font></strong> "csharp plain">("csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">i = 0; i < 100; i++)</td>
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            <td class="content">"csharp plain">{</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">x1 = rnd.Next(width);</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">y1 = rnd.Next(height);</td>
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            <td class="content">"csharp comments"><font color="#008200">// 线条长度在 12 以内</font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">x2 = x1 + rnd.Next(12);</td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">y2 = y1 + rnd.Next(12);</td>
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            <td class="content">"csharp comments"><font color="#008200">// 绘制两个坐标之间的连线</font></td>
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            <td class="content">"csharp comments"><font color="#008200">// 参数：起点(x1, y1)，终点(x2, y2);</font></td>
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            <td class="content">"csharp plain">g.DrawLine(p, x1, y1, x2, y2);</td>
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            <td class="content">"csharp plain">}</td>
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            <td class="content">"csharp comments"><font color="#008200">// 验证码字体</font></td>
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            <td class="content">"csharp plain">Font f = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">Font("csharp string"><font color="#0000ff">"Courier New"</font>"csharp plain">, 16, FontStyle.Bold);</td>
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            <td class="content">"csharp comments"><font color="#008200">// 验证码位置（左上角坐标）</font></td>
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            <td class="content">"csharp plain">PointF pf;</td>
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            <td class="content">"csharp comments"><font color="#008200">// 验证码</font></td>
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            <td class="content">"csharp plain">StringBuilder sb = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">StringBuilder();</td>
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            <td class="content">"csharp comments"><font color="#008200">// 4 位验证码</font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">for</font></strong> "csharp plain">("csharp keyword"><strong><font color="#006699">int</font></strong> "csharp plain">i = 0; i < 4; i++)</td>
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            <td class="content">"csharp plain">{</td>
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            <td class="content">"csharp comments"><font color="#008200">// 数字验证码</font></td>
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            <td class="content">"csharp keyword"><strong><font color="#006699">string</font></strong> "csharp plain">s = rnd.Next(10).ToString();</td>
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            <td class="content">"csharp plain">sb.Append(s);</td>
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            <td class="content"></td>
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            <td class="content">"csharp comments"><font color="#008200">// 验证码颜色（红绿蓝都在20到130之间）</font></td>
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            <td class="content">"csharp plain">b = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">SolidBrush(Color.FromArgb(rnd.Next(20, 130), rnd.Next(20, 130), rnd.Next(20, 130)));</td>
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            <td class="content">"csharp comments"><font color="#008200">// 可设置字符在图片中的位置</font></td>
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            <td class="content">"csharp plain">pf = "csharp keyword"><strong><font color="#006699">new</font></strong> "csharp plain">PointF(13 * i, -1);</td>
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            <td class="content">"csharp plain">g.DrawString(s, f, b, pf);</td>
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            <td class="content">"csharp plain">}</td>
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            <td class="content">"csharp comments"><font color="#008200">// 保存验证码</font></td>
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            <td class="content">"csharp plain">Session["csharp string"><font color="#0000ff">"Captcha"</font>"csharp plain">] = sb.ToString();</td>
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            <td class="content">"csharp comments"><font color="#008200">// 将图片以流输出</font></td>
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            <td class="content">"csharp plain">Response.ContentType = "csharp string"><font color="#0000ff">"image/pjpeg"</font>"csharp plain">;</td>
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            <td class="content">"csharp plain">img.Save(Response.OutputStream, ImageFormat.Jpeg);</td>
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            <td class="content">"csharp comments"><font color="#008200">// 释放资源</font></td>
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            <td class="content">"csharp plain">b.Dispose();</td>
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            <td class="content">"csharp plain">g.Dispose();</td>
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            <td class="content">"csharp plain">img.Dispose();</td>
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            <td class="content">"csharp plain">}</td>
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