如何在c#中计算HMAC SHA256

using System;
using System.Security.Cryptography;
using System.Text;

public static string ComputeHmacSha256(string data, string key)
{
    byte[] dataBytes = Encoding.UTF8.GetBytes(data);
    byte[] keyBytes = Encoding.UTF8.GetBytes(key);

    using (HMACSHA256 hmac = new HMACSHA256(keyBytes))
    {
        byte[] hashBytes = hmac.ComputeHash(dataBytes);
        return Convert.ToBase64String(hashBytes);
    }
}

string data = "Hello, World!";
string key = "mySecretKey";
string hmacSha256 = ComputeHmacSha256(data, key);
Console.WriteLine(hmacSha256);