Question

这是我第一次尝试让MVP与WinForms一起工作。我确实有一个更大的项目。但是，在这里我对WinForms MVP示例进行了非常简单的尝试。我只有一个模型，一个表单和两个视图。 Presenter连接在Program.cs中。一切都运作。但是，使用一个特定的用户控件，我似乎无法将其余的业务逻辑重构为Presenter。我试图做一个很容易修改为示例项目的例子。我真的不是在寻找简单的工作，而是在寻找“佳能”的答案，如果有这样的话。您可以提供的任何帮助或建议都值得赞赏。即使朝着正确的方向努力也会有很大的帮助。

我的MainFormPresenter：

internal class MainFormPresenter
{
    private readonly SimpleContext _context = new SimpleContext();
    private readonly IMainFormView _mainFormView;
    private readonly IPeopleListView _peopleListView;
    private readonly IPersonInfoView _personInfoView;

    public MainFormPresenter(IMainFormView mainFormView)
    {
        _peopleListView = mainFormView.PeopleListView;
        _personInfoView = mainFormView.PersonInfoView;

        _mainFormView = mainFormView;
        mainFormView.Load += MainFormViewOnLoad;
        mainFormView.FormClosed += MainFormViewOnFormClosed;

        _peopleListView.SelectionChanged += OnSelectedNameChanged;
    }

    private void OnSelectedNameChanged(object sender, EventArgs e)
    {
        int id = _peopleListView.GetSelectedId();
        Person person = _context.People.Find(id);

        _personInfoView.SetFirstName(person.FirstName);
        _personInfoView.SetLastName(person.LastName);
        _personInfoView.SetBirthDate(person.BirthDate);
    }

    private void MainFormViewOnFormClosed(object sender, FormClosedEventArgs e)
    {
        _context.Dispose();
    }

    private void MainFormViewOnLoad(object sender, EventArgs e)
    {
        _context.People.Load();

        BindingList<Person> people = _context.People.Local.ToBindingList();

        _peopleListView.SetDataSource(people);
    }
}

我的PeopleListView的背后代码：

public partial class PeopleListView : UserControl, IPeopleListView
{
    private readonly BindingSource _bSource;

    public PeopleListView()
    {
        _bSource = new BindingSource();
        InitializeComponent();
    }

    public int GetSelectedId()
    {
        DataGridViewRow row = PeopleGridView.CurrentRow;

        if (row != null)
        {
            Person person = (Person)row.DataBoundItem;
            return person.PersonId;
        }

        return 0;
    }

    public void SetDataSource(BindingList<Person> people)
    {
        _bSource.DataSource = people;
        _bSource.RaiseListChangedEvents = true;

        PeopleGridView.AutoGenerateColumns = false;
        PeopleGridView.DataSource = _bSource;
    }

    private void PeopleGridView_SelectionChanged(object sender, EventArgs e)
    {
        SelectionChanged?.Invoke(new object(), new EventArgs());
    }

    public event EventHandler SelectionChanged;
}

现在如何将此逻辑提取回Presenter？ MVP模式（根据Pluralsight的 - Windows窗体最佳实践）声明视图不应该关心它正在显示的数据。例如关注点分离。但我希望我的视图在模型更改时更新。

Answer 1

它可能不是佳能，但是，这就是我处理它的方式。建设性批评仍然受到欢迎。简单地说'只是称我为一个没有思想的白痴，或者告诉我我做了什么或做得不好的事情也是如此。

我修改过的演示者：

internal class MainFormPresenter
{
    private readonly SimpleContext _context = new SimpleContext();
    private readonly IMainFormView _mainFormView;
    private readonly IPeopleListView _peopleListView;
    private readonly IPersonInfoView _personInfoView;

    public MainFormPresenter(IMainFormView mainFormView)
    {
        _peopleListView = mainFormView.PeopleListView;
        _personInfoView = mainFormView.PersonInfoView;

        _mainFormView = mainFormView;
        _mainFormView.Load += MainFormViewOnLoad;
        _mainFormView.FormClosed += MainFormViewOnFormClosed;

        _peopleListView.SelectionChanged += OnSelectedNameChanged;
    }

    private void OnSelectedNameChanged(object sender, EventArgs e)
    {
        DataGridViewRow row = _peopleListView.GetSelectedRow();
        Person person = (Person) row.DataBoundItem;

        _personInfoView.SetFirstName(person.FirstName);
        _personInfoView.SetLastName(person.LastName);
        _personInfoView.SetBirthDate(person.BirthDate);
    }

    private void MainFormViewOnFormClosed(object sender, FormClosedEventArgs e)
    {
        _context.Dispose();
    }

    private void MainFormViewOnLoad(object sender, EventArgs e)
    {
        _context.People.Load();

        BindingList<Person> people = _context.People.Local.ToBindingList();

        BindingSource bSource = new BindingSource
        {
            DataSource = people,
            RaiseListChangedEvents = true
        };

        _peopleListView.SetDataSource(bSource);
    }
}

我的修改后的用户控制（查看）：

public partial class PeopleListView : UserControl, IPeopleListView
{
    public PeopleListView()
    {
        InitializeComponent();
    }

    public DataGridViewRow GetSelectedRow()
    {
        return PeopleGridView.CurrentRow;
    }

    public void SetDataSource(BindingSource bSource)
    {
        PeopleGridView.AutoGenerateColumns = false;
        PeopleGridView.DataSource = bSource;
    }

    private void PeopleGridView_SelectionChanged(object sender, EventArgs e)
    {
        SelectionChanged?.Invoke(new object(), new EventArgs());
    }

    public event EventHandler SelectionChanged;
}

如何从UserControl（View）中删除逻辑到演示者

1 个答案: