C#的SHA256加密

using System.Security.Cryptography;

  SHA256 mySHA256 = SHA256Managed.Create();
  byte[] ok = mySHA256.ComputeHash(System.Text.Encoding.Default.GetBytes(resp));
  System.Diagnostics.Debug.WriteLine(PrintByteArray(ok));

   private string PrintByteArray(byte[] array)
   {
       string ret = "";
       for (int i = 0; i < array.Length; i++)
       {
           ret += String.Format("{0:X2}", array[i]);
           //if ((i % 4) == 3) ret += " ";
       }
       return ret;
   }

resp is a string.