DEMOMySql/MicroServices/QuartzUI/QuartzNetAPI/Host/Common/StringExtension.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Host.Common
{
    public static class StringExtension
    {
        public static string ToBase64(this string str)
        {
            byte[] base64 = System.Text.Encoding.Default.GetBytes(str);
            return Convert.ToBase64String(base64);
        }
    }
}