C#入门保存对象到文件

因为要对文件做操作，所以首先还是要引入命名空间

//引入命名空间
using System.IO;

一、保存对象数据到文本文件中。

注意对象明确原则；

           //封装数据；
            Student objStudent = new Student()  //对象初始化器
            {
                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);
            //逐行写入
            sw.WriteLine(objStudent.StudentName);
            sw.WriteLine(objStudent.Age);
            sw.WriteLine(objStudent.Birthday);
            sw.WriteLine(objStudent.Gender);
            //关闭对象
            sw.Close();
            fs.Close();

二、读取对象数据，并显示；

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

            //显示数据
            this.txtStudentName.Text = objStudent.StudentName;
            this.txtAge.Text = objStudent.Age.ToString();
            this.txtBirthday.Text = objStudent.Birthday.ToShortDateString();
            this.txtGender.Text = objStudent.Gender;