C# 将文本字符串转换Base64字符串

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            // 将文本字符串转换Base64字符串
            string str = "test str";
            byte[] bytes = Encoding.UTF8.GetBytes(str);
            string base64Str = Convert.ToBase64String(bytes);
            Console.WriteLine();
        }
    }
}