/// <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;
  }
}

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();
  }
}