关于c#:C-字符串转换为指定编码集的-base64-字符串

using System;using System.Text;string EncodeBase64(string code_type, string code){    string encode = "";    byte[] bytes = Encoding.GetEncoding(code_type).GetBytes(code);    try    {        encode = Convert.ToBase64String(bytes);    }    catch    {        encode = code;    }    return encode;}

EncodeBase64("utf-8", "abc123");