C#入門保存對象到文件

因為要對文件做操作，所以首先還是要引入命名空間

//引入命名空間
using System.IO;

一、保存對象數據到文本文件中。

注意對象明確原則；

           //封裝數據；
            Student objStudent = new Student()  //對象初始化器
            {
                StudentName = this.txtStudentName.Text.Trim(),
                Age = Convert.ToInt32(this.txtAge.Text.Trim()),
                Birthday = Convert.ToDateTime(this.txtBirthday.Text.Trim()),
                Gender = this.txtGender.Text.Trim()
            };

            //保存到文件
            FileStream fs = new FileStream("objStudent.obj", FileMode.Create);
            StreamWriter sw = new StreamWriter(fs);
            //逐行寫入
            sw.WriteLine(objStudent.StudentName);
            sw.WriteLine(objStudent.Age);
            sw.WriteLine(objStudent.Birthday);
            sw.WriteLine(objStudent.Gender);
            //關閉對象
            sw.Close();
            fs.Close();

二、讀取對象數據，並顯示；

          FileStream fs = new FileStream("objStudent.obj", FileMode.Open);
            StreamReader sr = new StreamReader(fs);
            //逐行讀取；
            Student objStudent = new Student()
            {
                StudentName = sr.ReadLine(),
                Age = Convert.ToInt32(sr.ReadLine()),
                Birthday = Convert.ToDateTime(sr.ReadLine()),
                Gender = sr.ReadLine()
            };
            sr.Close();
            fs.Close();

            //顯示數據
            this.txtStudentName.Text = objStudent.StudentName;
            this.txtAge.Text = objStudent.Age.ToString();
            this.txtBirthday.Text = objStudent.Birthday.ToShortDateString();
            this.txtGender.Text = objStudent.Gender;