事件冒泡和MVP：ASP.NET [英] Event Bubbling and MVP: ASP.NET

查看：218 发布时间：2015/11/24 11:48:19 c# asp.net .net webforms mvp

本文介绍了事件冒泡和MVP：ASP.NET的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想学习MVP

这是使用Web窗体在ASP.NET中。我有两个用户控件CurrentTimeView.ascx和MonthViewControl.ascx。该CurrentTimeView里显示的时间。有一个文本框加上天在同一控制。新得到的日期被称为结果日期。当点击了添加天按钮，引发事件myBtnAddDaysClickedEvent。

It is using web forms in ASP.NET. I have two user controls CurrentTimeView.ascx and MonthViewControl.ascx. The CurrentTimeView displayes time. There is a textbox to add days in the same control. The newly got date is called "resultant date". When the button is clicked for add days, an event is raised "myBtnAddDaysClickedEvent".

在所述MonthViewControl，存在显示所得日期的月份的标签。在present我设置的变量monthValueToPass的采样值（因为我不知道如何正确地做到这一点）。 如何设置的值monthValueToPass变量，以使其符合MVP的模式？

On the MonthViewControl, there is a label that shows the month of the "resultant date". At present I am setting a sample value for the variable "monthValueToPass" (since I don’t know how to do it properly). How do I set the value for monthValueToPass variable to make it comply with MVP model?

string monthValueToPass = "TEST";
monthPresenter.SetMonth(monthValueToPass);

的期望是创建MVP，很容易做单元测试，并没有违反MVP的木构建筑。

注：虽然这是一个简单的例子，我用的MVP和验证机制，期待一个答案scalablt到绑定在GridView控件

Note: Though this is a simple example, I am expecting an answer scalablt to databinding in GridView control using MVP and validation mechanisms.

注：可以查看是完全独立的presenter

Note: Can view be totally independant of presenter?

注：每个用户的控制是独立的观点在这里

Note: Each user control is separate views here

注：可有对同一presenter多个视图（？像基于thier permisssion各种用户不同的控件）

Note: Can there be multiple views for same presenter (like different controls for various users based on thier permisssion?)

指南

模型 - 视图 - presenter - 指南

- 完成code -

--COMPLETE CODE--

using System;
public interface ICurrentTimeView
{
    //Property of View
    DateTime CurrentTime 
    {
        set; 
    }


//Method of View
void AttachPresenter(CurrentTimePresenter presenter);

}

using System;
public interface IMonthView
{
//Property of View
string MonthName 
{
    set; 
}

//Method of View
//View interface knows the presenter
void AttachPresenter(MonthPresenter presenter);

}

 using System;
 public class CurrentTimePresenter 
 {
private ICurrentTimeView view;

//Constructor for prsenter
public CurrentTimePresenter(ICurrentTimeView inputView) 
{
    if (inputView == null)
    {
        throw new ArgumentNullException("view may not be null");
    }

    this.view = inputView;
}

//Method defined in Presenter
public void SetCurrentTime(bool isPostBack) 
{
    if (!isPostBack) 
    {
        view.CurrentTime = DateTime.Now;
    }
}

//Method defined in Presenter
public void AddDays(string daysUnparsed, bool isPageValid) 
{
    if (isPageValid) 
    {
        view.CurrentTime = DateTime.Now.AddDays(double.Parse(daysUnparsed));

    }
}

}

using System;
public class MonthPresenter
{

private IMonthView monthView;

//Constructor for prsenter
public MonthPresenter(IMonthView inputView)
{
    if (inputView == null)
    {
        throw new ArgumentNullException("view may not be null");
    }

    this.monthView = inputView;
}


//Method defined in Presenter
//How does presenter decides the required value.
public void SetMonth(string monthValueInput) 
{
    if (!String.IsNullOrEmpty(monthValueInput))
    {
        monthView.MonthName = monthValueInput;
    }
    else
    {

    }


}

}

用户控制1

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="CurrentTimeView.ascx.cs" Inherits="Views_CurrentTimeView" %>

using System;
using System.Web.UI;
public partial class Views_CurrentTimeView : UserControl, ICurrentTimeView
{
//1. User control has no method other than view defined method for attaching presenter
//2. Properties has only set method

private CurrentTimePresenter presenter;

// Delegate 
public delegate void OnAddDaysClickedDelegate(string strValue);

// Event 
public event OnAddDaysClickedDelegate myBtnAddDaysClickedEvent;


//Provision for getting the presenter in User Control from aspx page.
public void AttachPresenter(CurrentTimePresenter presenter)
{
    if (presenter == null)
    {
        throw new ArgumentNullException("presenter may not be null");
    }
    this.presenter = presenter;
}

//Implement View's Property
public DateTime CurrentTime
{
    set
    {
        //During set of the property, set the control's value
        lblCurrentTime.Text = value.ToString();
    }
}


//Event Handler in User Control
protected void btnAddDays_OnClick(object sender, EventArgs e)
{
    if (presenter == null)
    {
        throw new FieldAccessException("presenter null");
    }

    //Ask presenter to do its functionality
    presenter.AddDays(txtNumberOfDays.Text, Page.IsValid);


    //Raise event
    if (myBtnAddDaysClickedEvent != null)
    {
        myBtnAddDaysClickedEvent(string.Empty);
    }


}

}

用户控制2

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="MonthViewControl.ascx.cs" Inherits="Views_MonthViewControl" %>

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Views_MonthViewControl : System.Web.UI.UserControl, IMonthView
{
//1. User control has no method other than view defined method for attaching presenter
//2. Properties has only set method

private MonthPresenter presenter;

//Provision for gettng the presenter in User Control from aspx page.
public void AttachPresenter(MonthPresenter presenter)
{
    if (presenter == null)
    {
        throw new ArgumentNullException("presenter may not be null");
    }
    this.presenter = presenter;
}

//Implement View's Property
public string MonthName
{
    set
    {
        //During set of the popert, set the control's value
        lblMonth.Text = value.ToString();
    }
}

protected void Page_Load(object sender, EventArgs e)
{

}

}

aspx页面

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ShowMeTheTime.aspx.cs"      Inherits="ShowTime" %>

<%@ Register TagPrefix="mvpProject" TagName="CurrentTimeView" Src="Views/CurrentTimeView.ascx" %>

<%@ Register TagPrefix="month" TagName="MonthView" Src="Views/MonthViewControl.ascx" %>

页面标题

PAGE TITLE

    <mvpProject:CurrentTimeView id="ucCtrlcurrentTimeView" runat="server" />
    <br />
    <br />
    <month:MonthView id="ucCtrlMonthView" runat="server" />

</form>

using System;
using System.Web.UI;

public partial class ShowTime : Page
{
CurrentTimePresenter currentTimePresenter;
MonthPresenter monthPresenter;

protected void Page_Load(object sender, EventArgs e) 
{
    HelperInitCurrentTimeView();
    HelperInitMonth();
}

private void HelperInitMonth()
{
    //Create presenter
    monthPresenter = new MonthPresenter(ucCtrlMonthView);

    //Pass the presenter object to user control
    ucCtrlMonthView.AttachPresenter(monthPresenter);

}

private void HelperInitCurrentTimeView() 
{
    //Cretes presenter by passing view(user control) to presenter.
    //User control has implemented IView
    currentTimePresenter = new CurrentTimePresenter(ucCtrlcurrentTimeView);

    //Pass the presenter object to user control
    ucCtrlcurrentTimeView.AttachPresenter(currentTimePresenter);

    //Call the presenter action to load time in user control.
    currentTimePresenter.SetCurrentTime(Page.IsPostBack);

    //Event described in User Control ???? Subsribe for it.
    ucCtrlcurrentTimeView.myBtnAddDaysClickedEvent += new Views_CurrentTimeView.OnAddDaysClickedDelegate(CurrentTimeViewControl_AddButtonClicked_MainPageHandler);


}


void CurrentTimeViewControl_AddButtonClicked_MainPageHandler(string strValue)
{
    string monthValue = "l";
    monthPresenter.SetMonth("SAMPLE VALUE");
    //myGridCntrl.CurentCharacter = theLetterCtrl.SelectedLetter;
    //myGridCntrl.LoadGridValues();
}

}

一些MVP的讨论：

模型 - 视图 - presenter - 指南

在MVP在哪里写的验证

<一个href="http://stackoverflow.com/questions/2203906/mvp-should-views-be-able-to-call-$p$psenter-methods-directly-or-should-they-alw">MVP - 如果意见能够直接调用presenter方法还是应该总是引发事件

MVP事件或财产

将在MVP模式 - 活动

MVP - 如果presenter使用Session

<一个href="http://stackoverflow.com/questions/4732490/why-do-$p$psenters-attach-to-view-events-instead-of-view-calling-$p$psenter-method">Why做presenters附加到查看事件，而不是调用查看大多数ASP.NET MVP实现presenter方法？

<一个href="http://stackoverflow.com/questions/1012069/mvp-public-methods-or-subscribe-to-view-events">Public方法或订阅查看事件

MVP模式，有多少意见，以一个presenter？

MVP和用户控件和调用

<一个href="http://stackoverflow.com/questions/5538813/asp-net-web-forms-model-view-$p$psenter-and-user-">ASP.NET Web窗体 - 模型 - 视图 - presenter和用户控件的控制

<一个href="http://stackoverflow.com/questions/2718864/restrict-violation-of-architecture-asp-net-mvp">Restrict违反建筑 - asp.net MVP

<一个href="http://stackoverflow.com/questions/8339303/control-modification-in-$p$psentation-layer">Control修改在presentation层

<一个href="http://stackoverflow.com/questions/2578750/decoupling-the-view-$p$psentation-and-asp-net-">Decoupling看来，presentation和ASP.NET Web窗体网页表单