MVP winform中的数据绑定

问题描述

我有一个WinForms应用程序在MVP中实现。我的表单有一个 TextBox ，我想将其$ code> Text 属性数据绑定到模型中的属性。我不想参考视图中的模型。

在Google中搜索后，我发现通过耦合模型和视图进行数据绑定是一个坏主意。我的样本初始化模型，查看和 Presenter

  class View：Form，IView 
 {
 public View（）
 { 
 InitializeComponent（）; 
 new Presenter（this）; 
} 
} 
 
 class Presenter 
 {
 public Presenter（IView）：this.Presenter（this，new Model（））
 {
} 
 
 public Presenter（IView view）
 {
} 
} 
 
类型号：IModel 
 {
 public Model（）
 {
} 
 
} 
  

目前我有3个项目，分别为模型，查看和演示者。视图引用 Presenter 和 Presenter 引用模型 。任何人都可以指导我如何在中查看中的控件的数据绑定到 Model ？

中的属性

编辑

我知道在Grid中做的事情。我们可以将数据源属性赋值给演示者中的列表（或类似的东西），如：

  _view.DataSource = _model.ListOfEmployees; 
  

当 ListOfEmployees 模型中的变化。但是，一个 TextBox 会暴露一个 Text 属性呢？我如何在MVP架构中绑定？

解决方案

我的建议是将View和Model封装在Presenter中。这意味着给定View的专门的Presenter（在大多数情况下）。在我看来，这是很好的，因为大多数模型将会有所不同。

  class Presenter {
 readonly IView view ; 
只读IModel模型; 
 
 public Presenter（）{
 //如果视图需要参考。演示者，传入视图ctor 
 view = new View（this）; 
 model = new Model（）; 
} 
 
 //或者 - 模型注入 - 我的偏好
 public Presenter（IModel Model）{
 // if view needs ref。演示者，传入视图ctor 
 view = new View（this）; 
 model = Model; 
} 
} 
  

在您的IView中，公开控件或控件的数据源属性：

 接口IView {
对象GridDataSource {get;组; 
} 
  

添加到您的Presenter一些方法：

  void SetGridDatasource（）{
 view.GridDatasource = model.SomeBindableData; 
} 
  

查看实现：

  public object GridDatasource {
 get {return myGridView.DataSource; } 
 set {myGridView.DataSource = value; } 
} 
  

注意：

代码片段未经测试，并推荐作为起点。

更新到评论

INotifyPropertyChanged 是一个非常 IView 和 IModel 之间的属性更新的有价值的机制。

DataBinding方法尽可能的。简单地通过IView公开这些属性，并让Presenter将这些绑定设置为IModel属性。

I have a WinForms application implemented in MVP. My form has a TextBox and I want to databind its Text property to a property in the Model. I don't want to refer to the Model in the View.

After searching in Google, I found that databinding by coupling Model and View is a bad idea. My sample initialization of Model, View and Presenter is as follows.

class View : Form, IView
{
    public View()
    {
        InitializeComponent();
        new Presenter(this);
    }
}

class Presenter
{
    public Presenter(IView) : this.Presenter(this, new Model())
    {
    }

    public Presenter(IView view)
    {
    }
}

class Model : IModel
{
    public Model()
    {
    }

}

At present I have 3 projects each for Model, View and Presenter. View has reference to Presenter and Presenter has reference to Model. Can anyone guide me how to form a databinding to a control in View to a property in Model?

EDIT

I know to do the things in Grid. We can assign Datasource property of grid to a List (or something similar) in presenter like:

_view.DataSource = _model.ListOfEmployees;

This will reflect the value in UI when ListOfEmployees changes in the Model. But what about a TextBox which exposes a Text property? How can I bind that in MVP architecture?

解决方案

My recommendation is to encapsulate the View and Model in the Presenter. This means a specialized Presenter (in most cases) for a given View. In my opinion, this works out well since most Models will be different anyway.

class Presenter {
    readonly IView view;
    readonly IModel model;

    public Presenter() {
        // if view needs ref. to presenter, pass into view ctor
        view = new View(this);
        model = new Model();
    }

    // alternatively - with the model injected - my preference
    public Presenter(IModel Model) {
        // if view needs ref. to presenter, pass into view ctor
        view = new View(this);
        model = Model;
    }
}

In your IView, expose a control or control's data source property:

interface IView {
    object GridDataSource { get; set; }
}

Add to your Presenter some method:

void SetGridDatasource() {
    view.GridDatasource = model.SomeBindableData;
}

View implementation:

public object GridDatasource {
    get { return myGridView.DataSource; }
    set { myGridView.DataSource = value; }
}

Note:
Code snippets are untested and recommended as a starting point.

Update to comments:
INotifyPropertyChanged is a very valuable mechanism for updating properties between IView and IModel.

Most controls do have some sort of binding capability. I would recommend using those DataBinding methods whenever possible. Simply expose those properties through IView and let the Presenter set those bindings to the IModel properties.

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