C#设计模式Demo——MVC

文件结构图

1.View

1.1页面示例

1.2View代码

using System;
using System.Data;
using System.Windows.Forms;
using MVC模式实例.Controller;
using MVC模式实例.DS;
using MVC模式实例.Model;
using MVC模式实例.MyEnum;namespace MVC模式实例.View
{public partial class ViewStudent : Form{public event EventHandler<EventArgsStudent> EventManage;public ViewStudent(){InitializeComponent();_ = new StudentController(this, new StudentModel());}private void btn_Add_Click(object sender, EventArgs e){EventArgsStudent instance = new EventArgsStudent(EOperation.Add);EventManage?.Invoke(this, instance);}private void btn_Query_Click(object sender, EventArgs e){EventManage?.Invoke(this, new EventArgsStudent(EOperation.Query));}private void btn_Updata_Click(object sender, EventArgs e){EventManage?.Invoke(this, CurArgsStudent(EOperation.Updata));}private void btn_RemoveName_Click(object sender, EventArgs e){EventManage?.Invoke(this, CurArgsStudent(EOperation.Remove_Nama));}private void btn_Remove_Click(object sender, EventArgs e){EventManage?.Invoke(this, CurArgsStudent(EOperation.Remove_Id));}private EventArgsStudent CurArgsStudent(EOperation type){EventArgsStudent eventArgsStudent = new EventArgsStudent(type);if (dataGridView1.CurrentCell != null){int index = dataGridView1.CurrentCell.RowIndex;Student.GetPropertyName(out string titleId, out string titleName, out string titleAge);var id = long.Parse(dataGridView1.Rows[index].Cells[titleId].Value.ToString());var name = dataGridView1.Rows[index].Cells[titleName].Value.ToString();var age = int.Parse(dataGridView1.Rows[index].Cells[titleAge].Value.ToString());eventArgsStudent = new EventArgsStudent(type, new Student(id, name, age));}else{MessageBox.Show("请选择数据！");}return eventArgsStudent;}public void DisplayResult(DataTable table){dataGridView1.DataSource = table;}}public class EventArgsStudent : EventArgs{public EOperation Type { get; set; }public Student Student { get; set; }public EventArgsStudent(EOperation type, Student student){Type = type;Student = student;}public EventArgsStudent(EOperation type){Type = type;}}}

1.3修改界面以及代码

using System;
using System.Windows.Forms;
using MVC模式实例.DS;namespace MVC模式实例.View
{public partial class FrmUpdataStudent : Form{public Student Student => new Student(long.Parse(textBox1.Text), textBox2.Text, int.Parse(textBox3.Text));public FrmUpdataStudent(object id, object name, object age){InitializeComponent();Student.GetPropertyName(out string titleId, out string titleName, out string titleAge);label1.Text = titleId;label2.Text = titleName;label3.Text = titleAge;textBox1.Text = id.ToString();textBox2.Text = name.ToString();textBox3.Text = age.ToString();textBox1.ReadOnly = true;}private void button1_Click(object sender, EventArgs e){if (int.TryParse(textBox3.Text, out _)){DialogResult = DialogResult.OK;}}}
}

2.Model

using System.Collections.Generic;
using System.Data;
using System.Windows.Forms;
using MVC模式实例.DS;
using MVC模式实例.Extension;namespace MVC模式实例.Model
{public class StudentModel{private List<Student> _studentList = new List<Student>();public void Add(Student student){_studentList.Add(student);}public void RemoveByIndex(int index){if (index == -1) return;var student = _studentList[index];Student.GetPropertyName(out string id, out string name, out string age);if (MessageBox.Show($"确认删除信息？" +$"\r\n【{name} = {student.Name}，{age} = {student.Age}】", "删除提示", MessageBoxButtons.YesNo) != DialogResult.Yes)return;_studentList.RemoveAt(index);}public void RemoveID(long id){RemoveByIndex(QueryIndexByID(id));}public void Remove(Student student){RemoveByIndex(QueryByNameAge(student.Name, student.Age));}public void Updata(Student oldStu, Student newStu){int index = QueryIndexByID(oldStu.ID);if (index != -1){if (oldStu.Name.Equals(newStu.Name) && oldStu.Age.Equals(newStu.Age)){MessageBox.Show("信息内容未修改，无需修改", "提示");return;}Student.GetPropertyName(out string id, out string name, out string age);if (MessageBox.Show($"修改" + $"\r\n【{name}  = {oldStu.Name}，{age}  = {oldStu.Age}】" +$"的信息为：" + $"\r\n【{name}  = {newStu.Name}，{age} = {newStu.Age}】" +$"", "修改提示", MessageBoxButtons.YesNo) != DialogResult.Yes){return;}_studentList[index].Name = newStu.Name;_studentList[index].Age = newStu.Age;}}public Student QueryByID(long id){var index = QueryIndexByID(id);return index != -1 ? _studentList[index].DeepCopy() : null;}public int QueryIndexByID(long id){for (int i = 0; i < _studentList.Count; i++){if (_studentList[i].ID == id)return i;}return -1;}public int QueryByNameAge(string name, int age){for (int i = 0; i < _studentList.Count; i++){var t = _studentList[i];if (t.Name == name && t.Age == age)return i;}return -1;}public DataTable Query(){Student.GetPropertyName(out string id, out string name, out string age);DataTable dt = new DataTable();dt.Columns.Add(id);dt.Columns.Add(name);dt.Columns.Add(age);foreach (var t in _studentList){dt.Rows.Add(t.ID, t.Name, t.Age);}return dt;}}
}

3.Controller

using System;
using System.Windows.Forms;
using MVC模式实例.DS;
using MVC模式实例.Extension;
using MVC模式实例.Model;
using MVC模式实例.MyEnum;
using MVC模式实例.View;namespace MVC模式实例.Controller
{public class StudentController{private readonly ViewStudent _view;private readonly StudentModel _model;public StudentController(ViewStudent view, StudentModel model){_view = view;_model = model;_view.EventManage += OnEventManage;}private void OnEventManage(object sender, EventArgsStudent e){switch (e.Type){case EOperation.Add:Random ran = new Random();var id = MyExtension.GetTimeLong();var name = ran.Next(100, 999).ToString();int age = ran.Next(18, 30);_model.Add(new Student(id, name, age));break;case EOperation.Remove_Id:_model.RemoveID(e.Student.ID);break;case EOperation.Remove_Nama:_model.Remove(e.Student);break;case EOperation.Updata:FrmUpdataStudent dialog = new FrmUpdataStudent(e.Student);var ret = dialog.ShowDialog();if (ret != DialogResult.OK) return;Student oldStu = e.Student;Student newStu = dialog.Student;_model.Updata(oldStu, newStu);break;case EOperation.Query:break;}_view.DisplayResult(_model.Query());}}
}

4.数据结构

using System.ComponentModel;
using MVC模式实例.Extension;namespace MVC模式实例.DS
{public class Student{[Description("ID")]public long ID { get; set; }[Description("姓名")]public string Name { get; set; }[Description("年龄")]public int Age { get; set; }public Student(long id, string name, int age){ID = id;Name = name;Age = age;}public static void GetPropertyName(out string titleId, out string titleName, out string titleAge){titleId = GetPropertyName(nameof(ID));titleName = GetPropertyName(nameof(Name));titleAge = GetPropertyName(nameof(Age));}public static string GetPropertyName(string propertyName){return CachedDescriptionHelper.GetPropertyDescription<Student>(propertyName);}}
}

5.枚举类型

using System.ComponentModel;namespace MVC模式实例.MyEnum
{/// <summary>/// 删除操作/// </summary>public enum EOperation{[Description("添加数据")]Add,[Description("通过ID删除")]Remove_Id,[Description("通过姓名删除")]Remove_Nama,[Description("修改数据")]Updata,[Description("查询数据")]Query,}
}

6.工具类

6.1缓存信息

存储枚举、类属性成员的描述信息

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;namespace MVC模式实例.Extension
{public static class CachedDescriptionHelper{private static readonly Dictionary<string, string> descriptionCache = new Dictionary<string, string>();public static string GetPropertyDescription<T>(string propertyName){string cacheKey = $"{typeof(T).FullName}.{propertyName}";if (descriptionCache.TryGetValue(cacheKey, out string description)){return description;}Type type = typeof(T);PropertyInfo property = type.GetProperty(propertyName);if (property != null){DescriptionAttribute descriptionAttribute = property.GetCustomAttribute<DescriptionAttribute>();if (descriptionAttribute != null){description = descriptionAttribute.Description;descriptionCache[cacheKey] = description;return description;}}FieldInfo field = type.GetField(propertyName);if (field != null){DescriptionAttribute descriptionAttribute = field.GetCustomAttribute<DescriptionAttribute>();if (descriptionAttribute != null){description = descriptionAttribute.Description;descriptionCache[cacheKey] = description;return description;}}return null;}}
}

6.2扩展类.

用于深度拷贝、获取时间戳。

using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;namespace MVC模式实例.Extension
{/// <summary>/// 扩展类/// </summary>public static class MyExtension{/// <summary>/// 深度拷贝/// </summary>public static T DeepCopy<T>(this T obj){if (!obj.GetType().IsSerializable){return default(T);}using (MemoryStream ms = new MemoryStream()){BinaryFormatter formatter = new BinaryFormatter();formatter.Serialize(ms, obj);ms.Position = 0;return (T)formatter.Deserialize(ms);}}/// <summary>/// 获取时间戳/// </summary>/// <returns></returns>public static long GetTimeLong(){long unixTimestampMs = (long)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalMilliseconds;return unixTimestampMs;}}
}