C#使用BinaryReader和BinaryWriter读写二进制文件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnReader_Click(object sender, EventArgs e)
        {
            string fileName = Environment.CurrentDirectory + @"test.dat"; ;
            string name;
            int age;
            double income = 10000.0;

            if (File.Exists(fileName)) {
                using(BinaryReader binaryReader = new BinaryReader(File.Open(fileName, FileMode.Open)))
                {
                    name = binaryReader.ReadString();
                    age = binaryReader.ReadInt32();
                    income = binaryReader.ReadDouble();
                }
                StringBuilder stringBuilder = new StringBuilder();
                stringBuilder.Append("姓名:" + name);
                stringBuilder.Append(" 年龄:" + age);
                stringBuilder.Append(" 收入:" + income);

                MessageBox.Show(stringBuilder.ToString());
            }
        }

        private void btnWriter_Click(object sender, EventArgs e)
        {
            string fileName = Environment.CurrentDirectory + @"test.dat";

            using (BinaryWriter binaryWriter = new BinaryWriter(File.Open(fileName, FileMode.Create)))
            {
                binaryWriter.Write("张三");
                binaryWriter.Write(23);
                binaryWriter.Write(10000.0);
            }
            MessageBox.Show("写入成功 " + fileName);
        }
    }
}