MD5方法代码，生成小写的md5 C#版本

public string GetMD5Str(string input)

{

// Use input string to calculate MD5 hash

MD5 md5 = System.Security.Cryptography.MD5.Create();

byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);

byte[] hashBytes = md5.ComputeHash(inputBytes);

// Convert the byte array to hexadecimal string

StringBuilder sb = new StringBuilder();

for (int i = 0; i < hashBytes.Length; i++)

{

sb.Append(hashBytes[i].ToString("X2"));

// To force the hex string to lower-case letters instead of

// upper-case, use he following line instead:

// sb.Append(hashBytes[i].ToString("x2"));

}

return sb.ToString().ToLower();

}