.NET生成随机数方法

先导入命名空间using System.Text;//用于使用StringBuilder 方法

 

protected static string GetNumPwd(int num)//生成数字随机数
         {
             string a = "0123456789";
             StringBuilder sb = new StringBuilder();
             for(int i = 0; i < num; i++)
             {
                 sb.Append(a[new Random(Guid.NewGuid().GetHashCode()).Next(0, a.Length -1)]);
             }
        
            return sb.ToString();
        }
        protected static string GetAbcPwd(int num)//生成字母随机数
        {
            string a = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < num; i++)
            {
                sb.Append(a[new Random(Guid.NewGuid().GetHashCode()).Next(0, a.Length - 1)]);
            }

            return sb.ToString();
        }
        protected static string GetMixPwd(int num)//生成混合随机数
        {
            string a = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < num; i++)
            {
                sb.Append(a[new Random(Guid.NewGuid().GetHashCode()).Next(0, a.Length - 1)]);
            }

            return sb.ToString();
        }