GenerateId类：生成唯一id、订单号

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using System;
using System.Security.Cryptography;

namespace Infrastructure
{
public class GenerateId
{
public static string GetGuidHash()
{
return Guid.NewGuid().ToString().GetHashCode().ToString("x");
}

/// <summary>
/// 生成一个长整型，可以转成19字节长的字符串
/// </summary>
/// <returns>System.Int64.</returns>
public static long GenerateLong()
{
byte[] buffer = Guid.NewGuid().ToByteArray();
return BitConverter.ToInt64(buffer, 0);
}

/// <summary>
/// 生成16个字节长度的数据与英文组合串
/// </summary>
public static string GenerateStr()
{
long i = 1;

foreach (byte b in Guid.NewGuid().ToByteArray())
{
i *= ((int)b + 1);
}

return String.Format("{0:x}", i - DateTime.Now.Ticks);
}

/// <summary>
/// 创建11位的英文与数字组合
/// </summary>
/// <returns>System.String.</returns>
public static string ShortStr()
{
return Convert(GenerateLong());
}

/// <summary>
/// 唯一订单号生成
/// </summary>
/// <returns></returns>
public static string GenerateOrderNumber()
{
string strDateTimeNumber = DateTime.Now.ToString("yyyyMMddHHmmssffff");
string strRandomResult = NextRandom(1000, 1).ToString("0000");

return strDateTimeNumber + strRandomResult;
}

#region private

/// <summary>
/// 参考：msdn上的RNGCryptoServiceProvider例子
/// </summary>
/// <param name="numSeeds"></param>
/// <param name="length"></param>
/// <returns></returns>
private static int NextRandom(int numSeeds, int length)
{
// Create a byte array to hold the random value.
byte[] randomNumber = new byte[length];
// Create a new instance of the RNGCryptoServiceProvider.
RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
// Fill the array with a random value.
rng.GetBytes(randomNumber);
// Convert the byte to an uint value to make the modulus operation easier.
uint randomResult = 0x0;
for (int i = 0; i < length; i++)
{
randomResult |= ((uint) randomNumber[i] << ((length - 1 - i)*8));
}