C# 泛型

原创已于 2023-03-26 18:07:55 修改 · 495 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#C# #泛型

于 2018-10-14 16:53:02 首次发布

c# 专栏收录该内容

83 篇文章

订阅专栏

本文介绍C#中泛型的使用，通过实例展示如何利用泛型获取不同对象的共同属性，并演示了如何使用泛型进行对象的数据库插入操作，提高了代码的复用性和灵活性。

1）使用泛型，获取不同对象的继承属性

using System;

namespace ConsoleApp10
{
    class Program
    {
        static void Main(string[] args)
        {
            //初始化老师
            Teacher teacherModel = new Teacher
            {
                ID = Guid.NewGuid().ToString(),
                Name = "张老师",
                TeacherNo = "T001"
            };
            //初始化学生
            Student studentModel = new Student
            {
                ID = Guid.NewGuid().ToString(),
                Name = "李学生",
                StudentNo = "S001"
            };
            //获取老师和学生的同一属性（ID）
            string teacherID = GetPersonID<Teacher>(teacherModel);
            string studentID = GetPersonID<Student>(studentModel);
        }
        /// <summary>
        /// 获取不同对象的相同属性，两个对象继承同一个父亲类
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="o"></param>
        /// <returns></returns>
        static string GetPersonID<T>(T o) where T : Person
        {
            T item = o as T;
            return item.ID;
        }
    }
    //老师类，继承人员类
    class Teacher : Person
    {
        public string TeacherNo { get; set; }
    }
    //学生类，继承人员类
    class Student : Person
    {
        public string StudentNo { get; set; }
    }
    //人员类
    class Person
    {
        public string ID { get; set; }
        public string Name { get; set; }
    }
}

2）使用泛型，将对象保存到数据库

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp10
{
    class Program
    {
        static void Main(string[] args)
        {
            //将老师对象插入数据库，返回对象
            Teacher teacherModel = new Teacher
            {
                TeacherNo = "T001",
                TeacherName = "张老师",
            };
            Teacher resultTeacher = Insert(teacherModel);

            //将学生对象插入数据库，返回对象
            Student studentModel = new Student
            {
                StudentNo = "S001",
                StudentName = "李学生",
            };
            Student resultStudent = Insert(studentModel);
        }
        
        /// <summary>
        /// 插入对象，并返回，可以获取到主键
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="item"></param>
        /// <returns></returns>
        private static T Insert<T>(T item) where T : class, new()
        {
            return item;
        }
    }
    //老师类
    class Teacher
    {
        public string TeacherID { get; set; }
        public string TeacherNo { get; set; }
        public string TeacherName { get; set; }
    }
    //学生类
    class Student
    {
        public string StudentID { get; set; }
        public string StudentNo { get; set; }
        public string StudentName { get; set; }
    }
}