/**
 * 产生随机整数，随机字符串，随机颜色等
 *
 * @param 
 * @arrange (512.笔记) jb51.cc
 **/
 public static class RandomHelper
 {
  private static Random randomSeed = new Random();
 
  /// <summary>
  /// Generates a random string with the given length
  /// </summary>
  /// <param name="size">Size of the string</param>
  /// <param name="lowerCase">If true,generate lowercase string</param>
  /// <returns>Random string</returns>
  public static string RandomString(int size,bool lowerCase)
  {
   // StringBuilder is faster than using strings (+=)
   StringBuilder RandStr = new StringBuilder(size);
 
   // Ascii start position (65 = A / 97 = a)
   int Start = (lowerCase) ? 97 : 65;
 
   // Add random chars
   for (int i = 0; i < size; i++)
    RandStr.Append((char)(26 * randomSeed.NextDouble() + Start));
 
   return RandStr.ToString();
  }
 
  /// <summary>
  /// Returns a random number.
  /// </summary>
  /// <param name="min">Minimal result</param>
  /// <param name="max">Maximal result</param>
  /// <returns>Random number</returns>
  public static int RandomNumber(int Minimal,int Maximal)
  {
   return randomSeed.Next(Minimal,Maximal);
  }
 
  /// <summary>
  /// Returns a random boolean value
  /// </summary>
  /// <returns>Random boolean value</returns>
  public static bool RandomBool()
  {
   return (randomSeed.NextDouble() > 0.5);
  }
 
  /// <summary>
  /// Returns a random color
  /// </summary>
  /// <returns></returns>
  public static System.Drawing.Color RandomColor()
  {
   return System.Drawing.Color.FromArgb(
    randomSeed.Next(256),randomSeed.Next(256),randomSeed.Next(256)
   );
  }
 
 }

//使用范例：
// Generate a random word:
string RandomWord = RandomHelper.RandomString(10,true);
 
// Generate a random number:
int Number = RandomHelper.RandomNumber(0,10);
 
// Generate a random boolean value:
bool Active = RandomHelper.RandomBool();
 
// Generate a random color:
Color Background = RandomHelper.RandomColor();


/***   来自编程之家 jb51.cc（jb51.cc）   ***/