Asp.NET 随机码生成基类（随机字母,随机数字,随机字母+数字）

复制代码代码如下:
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
namespace EC
{
/// <summary>
/// 随机函数
/// </summary>
public class RandomObject
{
#region 数字随机数
/// <summary>
/// 数字随机数
/// </summary>
/// <param name="n">生成长度</param>
/// <returns></returns>
public static string RandNum（int n）
{
char[] arrChar = new char[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
StringBuilder num = new StringBuilder（）;
Random rnd = new Random（DateTime.Now.Millisecond）;
for （int i = 0; i < n; i++）
{
num.Append（arrChar[rnd.Next（0, 9）].ToString（））;
}
return num.ToString（）;
}
#endregion
#region 数字和字母随机数
/// <summary>
/// 数字和字母随机数
/// </summary>
/// <param name="n">生成长度</param>
/// <returns></returns>
public static string RandCode（int n）
{
char[] arrChar = new char[]{
"a","b","d","c","e","f","g","h","i","j","k","l","m","n","p","r","q","s","t","u","v","w","z","y","x",
"0","1","2","3","4","5","6","7","8","9",
"A","B","C","D","E","F","G","H","I","J","K","L","M","N","Q","P","R","T","S","V","U","W","X","Y","Z"
};
StringBuilder num = new StringBuilder（）;
Random rnd = new Random（DateTime.Now.Millisecond）;
for （int i = 0; i < n; i++）
{
num.Append（arrChar[rnd.Next（0, arrChar.Length）].ToString（））;
}
return num.ToString（）;
}
#endregion
#region 字母随机数
/// <summary>
/// 字母随机数
/// </summary>
/// <param name="n">生成长度</param>
/// <returns></returns>
public static string RandLetter（int n）
{
char[] arrChar = new char[]{
"a","b","d","c","e","f","g","h","i","j","k","l","m","n","p","r","q","s","t","u","v","w","z","y","x",
"_",
"A","B","C","D","E","F","G","H","I","J","K","L","M","N","Q","P","R","T","S","V","U","W","X","Y","Z"
};
StringBuilder num = new StringBuilder（）;
Random rnd = new Random（DateTime.Now.Millisecond）;
for （int i = 0; i < n; i++）
{
num.Append（arrChar[rnd.Next（0, arrChar.Length）].ToString（））;
}
return num.ToString（）;
}
#endregion
#region 日期随机函数
/// <summary>
/// 日期随机函数
/// </summary>
/// <param name="ra">长度</param>
/// <returns></returns>
public static string DateRndName（Random ra）
{
DateTime d = DateTime.Now;
string s = null, y, m, dd, h, mm, ss;
y = d.Year.ToString（）;
m = d.Month.ToString（）;
if （m.Length < 2） m = "0" + m;
dd = d.Day.ToString（）;
if （dd.Length < 2） dd = "0" + dd;
h = d.Hour.ToString（）;
if （h.Length < 2） h = "0" + h;
mm = d.Minute.ToString（）;
if （mm.Length < 2） mm = "0" + mm;
ss = d.Second.ToString（）;
if （ss.Length < 2） ss = "0" + ss;
s += y + m + dd + h + mm + ss;
s += ra.Next（100, 999）.ToString（）;
return s;
}
#endregion
#region 生成GUID
/// <summary>
/// 生成GUID
/// </summary>
/// <returns></returns>
public static string GetGuid（）
{
System.Guid g = System.Guid.NewGuid（）;
return g.ToString（）;
}
#endregion
}
}