关键代码：

        /// <summary>        /// 生成设置范围内的Double的随机数        /// eg:_random.NextDouble(1.5, 2.5)        /// </summary>        /// <param name="random">Random</param>        /// <param name="miniDouble">生成随机数的最大值</param>        /// <param name="maxiDouble">生成随机数的最小值</param>        /// <returns>当Random等于NULL的时候返回0;</returns>        public static double NextDouble(this Random random, double miniDouble, double maxiDouble)        {            if (random != null)            {                return random.NextDouble() * (maxiDouble - miniDouble) + miniDouble;            }            else            {                return 0.0d;            }        }

测试代码：

        static void Main(string[] args)        {            try            {                Random _random = new Random();                for (int i = 0; i < 10; i++)                {                    Console.WriteLine(_random.NextDouble(1.5, 2.5));                }            }            catch (Exception ex)            {                Console.WriteLine(ex.Message);            }            finally            {                Console.ReadLine();            }        }

<style type="text/css">.csharpcode, .csharpcode pre{ font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/}.csharpcode pre { margin: 0em; }.csharpcode .rem { color: #008000; }.csharpcode .kwrd { color: #0000ff; }.csharpcode .str { color: #006080; }.csharpcode .op { color: #0000c0; }.csharpcode .preproc { color: #cc6633; }.csharpcode .asp { background-color: #ffff00; }.csharpcode .html { color: #800000; }.csharpcode .attr { color: #ff0000; }.csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em;}.csharpcode .lnum { color: #606060; }</style>测试结果：