c# Struct的一些问题分析

using System;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        private FundStruct s_fundStruct;

        public Form1()
        {
            InitializeComponent();
        }
      
        public Form1(ref FundStruct fundStruct)
        {
            InitializeComponent();
            s_fundStruct = fundStruct;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.textBox1.Text = s_fundStruct.Code;
            this.textBox2.Text = s_fundStruct.ShortName;
            ...
        }
    }

    public struct FundStruct
    {
        /// <summary>
        /// 编码
        /// </summary>
        internal readonly string Code;
        /// <summary>
        /// 内码编号
        /// </summary>
        internal readonly int Number;
        /// <summary>
        /// 简称
        /// </summary>
        internal readonly string ShortName;
        /// <summary>
        /// 全称
        /// </summary>
        internal readonly string LongName;

        internal FundStruct(string code, int number, string shortName, string longName)
        {
            Code = code ?? throw new ArgumentNullException(nameof(code));
            Number = number;
            ShortName = shortName ?? throw new ArgumentNullException(nameof(shortName));
            LongName = longName ?? throw new ArgumentNullException(nameof(longName));
        }
    }
}