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  1. using System;
  2. using System.Collections.Generic;
  3. using System.ComponentModel;
  4. using System.Data;
  5. using System.Drawing;
  6. using System.Linq;
  7. using System.Text;
  8. using System.Windows.Forms;
  9. using System.IO;
  10.  
  11. namespace WindowsFormsApplication1
  12. {
  13.     public partial class Form1 : Form
  14.     {
  15.         public Form1()
  16.         {
  17.             InitializeComponent();
  18.         }
  19.  
  20.         private void button1_Click(object sender, EventArgs e)
  21.         {
  22.             string path = Application.StartupPath + @"\test01.DAT";
  23.  
  24.             //byte配列へ変換
  25.             FileStream fsr = new FileStream( path,FileMode.Open,FileAccess.Read);
  26.             byte[] data = new byte[fsr.Length];
  27.             fsr.Read(data, 0, data.Length);
  28.             fsr.Close();
  29.             fsr.Dispose();
  30.             data[3] = 66;
  31.  
  32.             //上書き更新
  33.             FileStream fsw = new FileStream(path, FileMode.Create, FileAccess.Write);
  34.             fsw.Write(data, 0, data.Length);
  35.             fsw.Close();
  36.             fsw.Dispose();
  37.         }
  38.     }
  39. }
  40.  
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https://ideone.com/1ByPj
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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