如何用random 生成随机字串

Question

在26个字母中选取任意个数(比如 6)组成新的(600的话)字串,如何用random实现呢..对它不是很熟悉谢谢了.网上的一些贴子看了,但是还是有些不懂.请给出程序段...非常感谢,我会继续努力.

Answer 1

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;namespace RandomInt
{
   /// <summary>
   /// Summary description for Form1.
   /// </summary>
   public class RandomInt : System.Windows.Forms.Form
   {
      private System.Windows.Forms.Button showOutputButton;
      private System.Windows.Forms.Label outputLabel;
      /// <summary>
      /// Required designer variable.
      /// </summary>
      private System.ComponentModel.Container components = null;      public RandomInt()
      {
         //
         // Required for Windows Form Designer support
         //
         InitializeComponent();         //
         // TODO: Add any constructor code after InitializeComponent call
         //
      }      /// <summary>
      /// Clean up any resources being used.
      /// </summary>
      protected override void Dispose( bool disposing )
      {
         if( disposing )
         {
            if (components != null) 
            {
               components.Dispose();
            }
         }
         base.Dispose( disposing );
      }      #region Windows Form Designer generated code
      /// <summary>
      /// Required method for Designer support - do not modify
      /// the contents of this method with the code editor.
      /// </summary>
      private void InitializeComponent()
      {
         this.showOutputButton = new System.Windows.Forms.Button();
         this.outputLabel = new System.Windows.Forms.Label();
         this.SuspendLayout();
         // 
         // showOutputButton
         // 
         this.showOutputButton.Location = new System.Drawing.Point(101, 16);
         this.showOutputButton.Name = "showOutputButton";
         this.showOutputButton.Size = new System.Drawing.Size(91, 23);
         this.showOutputButton.TabIndex = 0;
         this.showOutputButton.Text = "Show Output";
         this.showOutputButton.Click += new System.EventHandler(this.showOutputButton_Click);
         // 
         // outputLabel
         // 
         this.outputLabel.Location = new System.Drawing.Point(14, 56);
         this.outputLabel.Name = "outputLabel";
         this.outputLabel.Size = new System.Drawing.Size(264, 64);
         this.outputLabel.TabIndex = 1;
         // 
         // RandomInt
         // 
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(292, 125);
         this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                      this.outputLabel,
                                                                      this.showOutputButton});
         this.Name = "RandomInt";
         this.Text = "RandomInt";
         this.ResumeLayout(false);      }
      #endregion      /// <summary>
      /// The main entry point for the application.
      /// </summary>
      [STAThread]
      static void Main() 
      {
         Application.Run(new RandomInt());
      }      private void showOutputButton_Click(object sender, System.EventArgs e)
      {
         Random randomInteger = new Random();         outputLabel.Text = "";         // loop 20 times
         for ( int counter = 1; counter <= 20; counter++ )
         {
            // pick random integer between 1 and 6
            int nextValue = randomInteger.Next( 1, 7 );
            
            outputLabel.Text += nextValue + "   "; // append value to output            // add newline after every 5 values
            if ( counter % 5 == 0 )
               outputLabel.Text += "\n";
         }
      }
   }
}

Answer 2

楼上的不用这么长吧，汉……我晕……首先用Random取数，
再用substring来截取，
很简单，建议搂主试着写写，
有很大帮助

Answer 3

using System;public class test
{
static void Main()
{
for(int i = 0; i < 10; i++)
{
Console.WriteLine(Rand(6));
}
} static string map = "abcdefghijklmnopqrstuvwxyz";
static Random rnd = new Random(unchecked((int)DateTime.Now.Ticks));
public static string Rand(int len)
{
char [] data = new char[len];
for(int i = 0; i < len; i++)
{
data[i] = map[rnd.Next() % map.Length];
}
return new String(data);
}
}

Answer 4

不好意思,上面的这个程序的结果是数字而且是单个的.
我希望的结果是:
                                           
aa ab ac....ba bb bc....za zb zc....
aaa aab aac ....
aba abb abc ....当然上面显示的是顺序的,如果是随机生成的话就应该是另外一回事情了。 所以,我想我的问题还是没得到解决.for  -----这个控制生成的个数
for -----这个控制随机数的位数(比如:bsadf 是五)
........----------这个部分的我就不懂了.

Answer 5

产生62位内任意数字大小写字母的随机数 
private static char[] constant=
  {
   '0','1','2','3','4','5','6','7','8','9',
   'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
   'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
  };
  public static string GenerateRandom(int Length)
  {   
   System.Text.StringBuilder newRandom = new System.Text.StringBuilder(62);
   Random rd= new Random();
   for(int i=0;i<Length;i++)
   {
    newRandom.Append(constant[rd.Next(62)]);
   }
   return newRandom.ToString();
  }

Answer 6

要是只要字母，改为如下： 
private static char[] constant=
  {
   'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
   'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
  };
  public static string GenerateRandom(int Length)
  {   
   System.Text.StringBuilder newRandom = new System.Text.StringBuilder(52);
   Random rd= new Random();
   for(int i=0;i<Length;i++)
   {
    newRandom.Append(constant[rd.Next(52)]);
   }
   return newRandom.ToString();
  }//调用---------------
sting str=GenerateRandom(6);

Answer 7

看一眼:   http://www.sz3000.com/index.htm?QQ=822982