Winform之GDI绘制验证码

主要功能：点击验证码可更换，输入验证码进行登陆

需要导入命名空间System.Drawing;

产生五位的随机字符串：

1　　　　　　　　Random random = new Random();
             //产生5个随机字符串
             str = null;
             for (int i = ; i < ; i++)
             {
                 int j = random.Next(, );
                 str = str + (char)j;
             }

画字符串

             //创建图片
             Bitmap bmp = new Bitmap(,);
             //创建GDI对象
             Graphics g = Graphics.FromImage(bmp);
             //循环画字符串
             for (int i = ; i < str.Length; i++)
             {
                 Point p = new Point(i*,);
                 //随机字体
                 string[] fonts = { "宋体", "黑体", "微软雅黑", "隶属", "仿宋", };
                 //随机颜色
                 Color[] colors = { Color.Red, Color.Aquamarine, Color.Blue, Color.Yellow, Color.YellowGreen };
                 //画字符串
                 g.DrawString(str[i].ToString(), new Font(fonts[random.Next(, fonts.Length)], , FontStyle.Bold), new SolidBrush(colors[random.Next(, colors.Length)]), p);
             }                

到这里效果如下：

aaarticlea/png;base64,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" alt="" />

这时候我们在加入一些线条：

 　　　　　　　for (int i = ; i < ; i++)
             {
                 Point p1 = new Point(random.Next(, bmp.Width), random.Next(, bmp.Height));
                 Point p2 = new Point(random.Next(, bmp.Width), random.Next(, bmp.Height));
                 g.DrawLine(new Pen(Color.Green), p1, p2);
             }

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JEU16AaMoLEG0P5QWgKWOVF4CZUl6AaMoLEE15AaIpL0A05QWIljYAiJV+dPUnV3587V9+dPX1f3vz8JxuAMzDzZs3b926la799NZ/XL/57z+5cfUwnf4PYB7eeeedd9999/8B/m04Cd6jMHUAAAAASUVORK5CYII=" alt="" />

在画一些像素点：

            //画像素点
             for (int i = ; i < ; i++)
             {
                 Point p = new Point(random.Next(, bmp.Width), random.Next(, bmp.Height));
                 bmp.SetPixel(p.X, p.Y, Color.Black);
             }                

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAc4AAAEDCAIAAAAz8nONAAAQVUlEQVR4nO3dT4gk1R3A8XeKxkQ0xqy6eBAUGXMNHrIT8Ji5LMocJJdgRmIEg9mAg42SsM2EEHLYVZaEmGbczR+9mEIJBI07mKkY0MAGVNjsIeNC7zCbjO4kKchxZrZzqKrXr96f6uqe+m1vVX8/NGtPVXV1TU/Pt1+/7h7VLgA03/uPPHI9nNwDi+N4e3tbXftbBABqN/XIlqR2a2uL1AJog6lHtiS1m5ubpBZAG0w9siWpvXTpEqkF0AZTjyypBdAkc6VCl5p6ZKumNq5M5NYFgN3d3Wue2sFgMBgMypfUnFpr9d9fOZyePvr1XedW73jvpUN/OnU7qcW4NnqLw1+Uxd7GcM1ax1qQLeysDdcHLfY2CntOl/U8F3GuAte1kp4KjWrNth6ks5On9urO21d33r76yev7l3+1f+nE73/yBVKLya11zOytdebmFhcX53RZd3d3d3c3NtZ6i948bvQWA9Es7tdZV9g/rnvXPrW6sAfs7ISp/eDMnVc/eX3/8pn9Syf3P35u/8K3X/nhzaQW48sjaSRxOKD1DW03eotuIIOpdQpufBXuM65XU0ntwcezY6TW8t4vDu1fOrG/8fzehSf2Pnx472/zv1z+LKnF+LLe5QHdsIetzoKyvTisMW1hGOttNq5v7R/V/vXLN8ZzN711/+dev+/mOI7/eOK2/QtP7H348O65r+2+/8Duu4dffPpGUovxZfXb6C3OdXq9Re+UaqfTmZtb7HQWrfnVYUj9qbVjWtyK6YNrYtyXsEbubYJVdY1nr8Vc7dr9N/3vD298+rMXz9xzSxzHv/vRLXvn5vfee2DvL4d341t341tPPHUDqcXY8hqWTakWmBuOSG3hlTPnSpg+uDZqT22J0KVqnDcQfwdCdN/Nn/78hYvfWXrh7tviOD7z3OdfeuamU8duPPndG048dcOJpz5DajGJ4hsFCiHMx5zFsWkwtVZWs9Au9jYKPfdgaNt6B5xAqOvkHpgntS/fc+vHTy598NWvrNz1Jd5XCwlpOPN86sBaswBVR7VrnblOx96X7zpJbftNPbJjpPbk3V/88eHbf3DnoWcO3RHH8fNv9NPTs69d/P5v/5FGltRiEvnws5eGMe9n9l87k3pxb23kXK2Tbe91k9rWm3pkx0it5dnXLv7m3cHJNwfLrw6+8dNzpBaT6RlvnTXaOmztml3JtY5b5Uqp7dmfaZib66xVniJGk009smOk1jwTx/G3Tn30wpuD5VcH3zy199DT75BaHJh3xsBJaDopmy078KhWZx2tNvXITp7arz/754e+986RJ88++PhbDz7+FqnFgfmey7uDzsKSCqktf/GL+YPZMPXIjpHaiq7hrYeWGPYwfVEsoFjS0r+AMGd82Mw7qjUuzZgWU2SnFgBQO1ILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgLkvtBQBATYKpTQAAdSC1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFIL+KmuUl37t0Cp0b8X5dtU2YO5ZcXtvZuFLlv9GMyLjPy+Jtjt7CC1mDmhKKRtLZyUs8R78m5Wfll37cjrmuBaqu9Nec7rm6virVrnD6l1SC1mUWgMGOqFmx5rS9Ee1dB05Y+puTB0qDS0FqQWKPCWNFvlS1KVvbk7rNIvd5vQI8S4+wkdkr/gqqzyI78LpEgtZk44f4P8pJRaN9cWzgfGgKEy1tgj98hDBxk6JGtV+TYVD2asS80sUgskSq0bnTVPy8GLGGM6pVTfuExfqWWlBqWdvXf17PHB+fSklDreX1FKqeXT2Zfpqv6KdyyswoerT6vh9Btfzh/tp8dw+kj4saTKTAKFHYnUYqbls5i6UevFLwdKLZRdsKtUd3jJJEkW8lHxQKmFYm2tgaRSS4+lSV1fMtam+Tt9RPmfoacLs8cBpZRSq/k1ple3nOe+5FvOziysHMtb/9iy0vsvHqTnW8AESC1mizOyW7DGgvlyczIhPHubbmFMaOqFaQpLDkAplY9tzw4XLp8+Pjh/bHU++9IYYOqrWDAeE8wHigVVMPJ2SKWpTa+xMJjtel4uC90II5eA1GJ2GYNCO6nG8kFoTGdmLlvSzWq4mpd71AFkA9usdErpIW1hs2L1lo2Ou6Nalc8eLJQedpIkR9bzGYyu5yUv72VLbknveWikdmoeffkyJ+lT6MY36tm3UpsvN0e7nhlbZWyxbj3L7mazCtby0JHo2dLsGf36kmczo4DmoZqPFd75Cuu69MNJXvnTbl7di7uxtnYYukZopHZqHn358gCSSlKbuB9YMGYPsg18EwvG2mHj/BMFTrz8h5FPmB5bnT+yfv744OzRBedtBt1hQ93XrFQxtYmvtva31jUmPbpp688eXRg97TDie6kwcTGzSO3UkFppI1Kbje+MOdlCefUZ/Xr+cESpWY1zr8KcwA1to5/IHy8Oad1n9NbAOTGmC7ypLVxRcVf3rp7NvjRa773eKo8ZjG1HmonUhp7+VL+4pZajIrXSQqk1xnqh18SMCvu6kza07zQueBcqrVUaO6VU4fUxp7DWBwr0Eje11vV677RH1s+rrjq6oKw3QpTcXKGFtLWKtqXWW0P3ruAdoZiXLQkrqW2K8lFtEk5tvrbvncbVd4NQgt27n93K0Ptb+yvWrsydWPvUe9ZTwwvmtXQ9R2JcfEl1lX79Lc1u8OR8p6Gj8i5Bqm2pTbkPuSPvAeUP3RKP4aRW2sjUJr4JWSMxhTfbJs7rUWaJzbuHlV3Py/rFYCWJ/ew+Md53Ze/ct9vJT/l+9HRt9TuwMlS/1MxqW2qtsFZPJKltnwlTmw11l91cWvcNK7UlhR2reiWnwgEYFxm+rzbfrLyA6WWHk7P5DIb+IINzK404cntj4utoc2rdn7dyxibWqtCSktROfMcitdKqvSzWd4auup9Ghcepp/0mMLekofNOUpXxYJ9tmdPLrTd76Wt0v1m9dsSMQaCnofs5ba2izalNnNlYazPvGXMbfSnlsDab4FBJrTRvapX9SLmeh7Wf/2zd1Nrvq023Ww1UUun53dDrVMWZhMcCHyIoGyOr4XVlb4/wbhY+He+v3Du888+r9O29xsLAzVXprk55XS1MrVtD72buGbetSeBOU8s9idRKqzaBoF/AH+Q/cfNzYoVPi5k/feV8hCFbG4iv54l2/qar9KOx4w0wx187PLziByXSo9IfEa44XRv6LRv5qzez2pZazRvTimvNJaS2uUKjWjtGnj93YHZ2PfTjVsbsg7lcJ3i8bipPGYfX5V2Ys16d89yZS67adwCh/WBi7Uyt9ZDrRlMvqZJai7urye6RpFZalbnaJCm8B8uX4PCLS8XMlfTUvqBvA5W/7yr7AzTd/M6WH57/4H1ztd7NzMK6o1f9QYbsz4x1Pf01v5Hy+zyNdrUttVYN3X+9myWB1IYySmobocrfQDB+iAP7NKqb5gOwOYbt+yYWEvd1fLWUztLqv5dopu34+pI1wCy5iypfagv30uF+st0eNf4OWJIk+r29JffnKvdzIhvSttRq5SV1l3vvx97loYXjIrXSRn5azFm+bqS2H5pACM6HFicdvNsnWR/nj/az+VlzhjT9C4q6d+4Mg3XAy57HB51Oz7yw3r/+a17Z2oUVpf8eefg1uiq3YfmqWdbC1BoP1B7uluXbhHZ+cKRWWvVRrXdV6A/NZGuLAVLmk30rkYFIlUwshA7MmmMNfQvuboc7V/6Mho4WdWlhapuC1Eobd1RbUaielSZnVaFrJfsMXnvpux1KTiV7806MFDYIvAejygEjRWqnhtRKq/b3akfMS5qDUE9kiwNDfZGKMRqrleUBHUZTGUNU37tuSm6T8iJPvBAJqZ0iUiutyvtqy/mbpcen42Sl8My9OLYNPqN3Br+TfAtd+7pCh2cepLV8rG/zIEfbYqR2akittIknELxhcptbWB7KpXcEGthVdVUuqwIj9yoF12tDO6l4DNBI7dSQWmmTjWrLcxmab634bHqsyFZ5SAgtNAfd4w7AR16LvooqB4kUqZ2aqf9/t2bhNPKnEHoW792yZCfebcwv0yuyr7rCmw4PonoNpYfYILUAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UttsUXtN+6YF6kRqm62tSWrr94WZRWqbLYqi/7YRqUXLkNpmI7VAI5DaZoui6D81UYb0S728/FJ1HYCJ1KJlSG2z1ZhazUytWVIzxNbGtSO1aBlS22xRFP27Dkop64y70PrXVcuRpEgtWobUNlsURTs1UUrpf71L3A3cL+tCatEypLbZakztjhHT1I5TXjespBaogtQ2WxRFV2qilCpfnp7xTh2k6jqSK1eukFq0DKlttiiKPq2DUir912Wu1f9aF6wdqUXLkNpmqyu1Kbeb5hJvcN0ztSC1aBlS22xRFH1SH++o1lqrz4fO1ILUomVIbbNFUbRdK6WU93xolXumFqQWLUNqm6321G7n0XTTaaXWVeMxkFq0DKlttiiK/lWHkvcVpNJtyvdQy5GkSC1ahtQ2WxRF/2wjUouWIbXNRmqBRiC1zRZF0eU2IrVoGVLbbKQWaARS22xy/2uvqZv2TQvUidQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoA4UgsA4kgtAIgjtQAgjtQCgDhSCwDiSC0AiCO1ACCO1AKAOFILAOJILQCII7UAII7UAoC4stReAADUJJhadwUAoC6kFgDEkVoAEBfH8ebmJqkFAEFxHG9tbZFaABAUx/H29japBQBBcRzv7OyoGAAgKUkSdQkAIGBzc3Nra2t7e3tnZ+f/KvDnqjShtlYAAAAASUVORK5CYII=" alt="" />

大致就这样了，没什么技术含量！

源码地址：http://pan.baidu.com/s/1gdgYqpt