MVP

 

MVP是一种广泛使用的UI架构模式，适用于基于事件驱动的应用框架。

能够与 Model直接进行交互的仅限于 Presenter, View 只能通过 Presenter 间拉地调用 Model。

MVP分PV（Passive View) 和 （Supervising Controller)两种模式

SC(Supervising Controller)

public partial class WebForm1 : System.Web.UI.Page,IEmployeeSearchView
    {
        public EmployeeSearchPresenter Presenter { get; private set; }
        public event EventHandler<DepartmentSelectedEventArgs> DepartmentSelected;

        public WebForm1()
        {
            this.Presenter = new EmployeeSearchPresenter(this);
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {
                this.Presenter.Initialize();
            }
        }

        protected void ButtonSearch_Click(object sender, EventArgs e)
        {
            string department = this.DropDownListDepartments.SelectedValue;
            DepartmentSelectedEventArgs eventArgs = new DepartmentSelectedEventArgs(department);
            if (null != DepartmentSelected)
            {
                DepartmentSelected(this, eventArgs);
            }
        }

        public void BindEmployees(IEnumerable<Employee> employees)
        {
            this.GridViewEmployees.DataSource = employees;
            this.GridViewEmployees.DataBind();
        }

        public void BindDepartments(IEnumerable<string> departments)
        {
            this.DropDownListDepartments.DataSource = departments;
            this.DropDownListDepartments.DataBind();
        }

    }

    public class EmployeeSearchPresenter
    {
        public IEmployeeSearchView View { get; private set; }
        public EmployeeRepository Repository { get; private set; }

        public EmployeeSearchPresenter(IEmployeeSearchView view)
        {
            this.View = view;
            this.Repository = new EmployeeRepository();
            this.View.DepartmentSelected += OnDepartmentSelected;
        }

        private void OnDepartmentSelected(object sender, DepartmentSelectedEventArgs e)
        {
            string department = e.Department;
            var employees = this.Repository.GetEmployees(department);
            this.View.BindEmployees(employees);
        }

        public void Initialize()
        {
            IEnumerable<Employee> employees = this.Repository.GetEmployees();
            this.View.BindEmployees(employees);
            string[] departments = new string[] { "销售部", "采购部", "人事部", "IT部" };
            this.View.BindDepartments(departments);
        }
    }

    public class DepartmentSelectedEventArgs : EventArgs
    {
        public string Department { get; private set; }
        public DepartmentSelectedEventArgs(string department)
        {
            this.Department = department;
        }
    }

    public interface IEmployeeSearchView
    {
        void BindEmployees(IEnumerable<Employee> employees);
        void BindDepartments(IEnumerable<string> departments);
        event EventHandler<DepartmentSelectedEventArgs> DepartmentSelected;
    }

    public class EmployeeRepository
    {
        private static IList<Employee> employees;
        static EmployeeRepository()
        {
            employees = new List<Employee>();
            employees.Add(new Employee("001", "张三", "男", new DateTime(1981, 8, 24), "销售部"));
            employees.Add(new Employee("002", "李四", "女", new DateTime(1982, 7, 24), "人事部"));
            employees.Add(new Employee("003", "王五", "男", new DateTime(1981, 9, 21), "销售部"));
            employees.Add(new Employee("004", "张三1", "男", new DateTime(1981, 8, 24), "销售部"));
            employees.Add(new Employee("005", "张三2", "男", new DateTime(1981, 8, 24), "销售部"));
            employees.Add(new Employee("006", "张三3", "男", new DateTime(1981, 8, 24), "销售部"));
        }

        public IEnumerable<Employee> GetEmployees(string department = "")
        {
            if (string.IsNullOrEmpty(department))
            {
                return employees;
            }
            return employees.Where(e => e.Department == department).ToArray();
        }
    }

    public class Employee
    {
        public string Id { get; private set; }
        public string Name { get; private set; }
        public string Gender { get;private  set; }
        public DateTime BirthDate { get; private set; }
        public string Department { get; private set; }

        public Employee(string id,string name,string gender,DateTime birthDate,string department)
        {
            this.Id = id;
            this.Name = name;
            this.Gender = gender;
            this.BirthDate = birthDate;
            this.Department = department;
        }
    }

界面部分aspx

<form id="form1" runat="server">
    <div>
        <div class="top">
            选择查询部门：
            <asp:DropDownList ID="DropDownListDepartments" runat="server"></asp:DropDownList>
            <asp:Button ID="ButtonSearch" runat="server" Text="查询" OnClick="ButtonSearch_Click" />
        </div>
        <asp:GridView ID="GridViewEmployees" runat="server" AutoGenerateColumns="false" Width="100%">
            <Columns>
                <asp:BoundField DataField="Name" HeaderText="姓名" />
                <asp:BoundField DataField="Gender" HeaderText="性别" />
                <asp:BoundField DataField="BirthDate" HeaderText="出生日期" DataFormatString="{0:dd/MM/yyyy}" />
                <asp:BoundField DataField="Department" HeaderText="部门" />
            </Columns>
        </asp:GridView>
    </div>
    </form>

主要就是aspx实现接口，Presenter接收View，执行相关方法，将Model与界面分离