yrjw.CommonToolsCore/Helper/ValidateCodeHelper.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Text;

namespace yrjw.CommonToolsCore.Helper
{
    public class ValidateCodeHelper
    {
        /// <summary>
        /// 生成随机的字符串
        /// </summary>
        /// <param name="codeCount"></param>
        /// <returns></returns>
        public static string CreateRandomCode(int codeCount)
        {
            string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,a,b,c,d,e,f,g,h,i,g,k,l,m,n,o,p,q,r,F,G,H,I,G,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,s,t,u,v,w,x,y,z";
            string[] allCharArray = allChar.Split(',');
            string randomCode = "";
            int temp = -1;
            Random rand = new Random();
            for (int i = 0; i < codeCount; i++)
            {
                if (temp != -1)
                {
                    rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
                }
                int t = rand.Next(35);
                if (temp == t)
                {
                    return CreateRandomCode(codeCount);
                }
                temp = t;
                randomCode += allCharArray[t];
            }
            return randomCode;
        }
        /// <summary>
        /// 存数值验证码
        /// </summary>
        /// <param name="length"></param>
        /// <returns></returns>
        public static string CreateRandomNums(int length)
        {
            Random rand = new Random();
            int[] ints = new int[length];
            for (int i = 0; i < length; i++)
            {
                ints[i] = rand.Next(0, 9);
            }
            return string.Join("", ints);
        }

        /// <summary>
        /// 创建验证码图片
        /// </summary>
        /// <param name="validateCode"></param>