VS使用openFileDialog读写txt和bin文件（C#语言）

1、BIN文件

(1) 创建布局文件并添加openFileDialog和saveFileDialog

（2）打开按钮事件

 FileStream Myfile;
        BinaryReader binreader;
        BinaryWriter binwriter;
        int file_len;//bin文件长度
        int count = 1;
        byte[] binchar = new byte[] { };//文件数据存储
 
        private void button1_Click(object sender, EventArgs e)//打开文件按钮
        {
            openFileDialog1.Filter = "*.bin|*.BIN";
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                fileName.Text = openFileDialog1.FileName;
                StringBuilder str = new StringBuilder();
                Myfile = new FileStream(openFileDialog1.FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                binreader = new BinaryReader(Myfile);
                binwriter = new BinaryWriter(Myfile);
                file_len = (int)Myfile.Length;//获取bin文件长度
                binchar = binreader.ReadBytes(file_len);
 
                foreach (byte j in binchar)
                {
                    str.Append(j.ToString("X2") + " ");
                    if (count >= 8)
                    {
                        count = 0;
                        str.Append("\r\n");
                    }
                    count++;
                }
                text2.Text = str.ToString();
 
 
                MessageBox.Show("查询成功！");
 
            }
        }

（3）写入按钮事件

private Byte[] AsciiCharToByte8(string Str)
        {
            Byte[] tByte = Encoding.ASCII.GetBytes(Str);
            return tByte;
        }
 
        private void button2_Click(object sender, EventArgs e)//写入文件按钮
        {
            byte[] insert_data = AsciiCharToByte8("hello");//在打开的文件前加入hello
            byte[] binchar0 = new byte[file_len + 5];
            for (int i = 0; (i < insert_data.Length); i++)
            {
                binchar0[i] = insert_data[i];
            }
            for(int i=0;i
            {
                binchar0[i + 5] = binchar[i]; 
            }
 
            Myfile.Seek(0, SeekOrigin.Begin);
            binwriter.Write(binchar0);
            binreader.Close();
            binwriter.Close();
            Myfile.Close();
        }

2、TXT文件

（1）创建布局界面

（2）打开按钮事件

 private void button_open_txt_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "(*.txt)|*.txt";
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                fileName_txt.Text = openFileDialog1.FileName;
                textBox_display_txt.Clear();
                StreamReader sr = new StreamReader(openFileDialog1.FileName, System.Text.Encoding.Default);
                string line;
                while ((line = sr.ReadLine()) != null)
                {
                    textBox_display_txt.Text += line;
                }
                sr.Close();
            }
        }

（3）写入按钮事件

 private void button_write_txt_Click(object sender, EventArgs e)
        {
            bool flag = true;
            StreamWriter sw = null;
            try
            {
                sw = new StreamWriter(openFileDialog1.FileName);//创建StreamWriter对象
                sw.WriteLine(textBox_display_txt.Text);
            }
            catch (Exception ex)
            {
                Console.WriteLine("写入流异常：" + ex.ToString());
                flag = false;
            }
            finally
            {
                sw.Close();//确保最后总会关闭流
                Console.WriteLine("写入流关闭");
            }
            if (flag)
            {
                MessageBox.Show("文件已保存！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }