MD5加密

为了保证数据库密码安全，或者其他，需要加密一些东西

using System.Security.Cryptography;

static string GetMD5(string str)
        {
            MD5 md5 = MD5.Create();
            byte[] buffer = Encoding.Default.GetBytes(str);
            byte[] bufferMd5 = md5.ComputeHash(buffer);
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < bufferMd5.Length; i++)
            {
                sb.Append(bufferMd5[i].ToString("x2"));
            }
            return sb.ToString();
        }