ReactiveUI 6.0和WinForms绑定

时间:2014-07-15 21:37:54

标签: c# winforms reactiveui

现在ReactiveUI 6.0 has been released,我对公共性有一个问题:绑定ReactiveObject和Windows窗体的最佳或最有效的方法是什么。

这是我到目前为止所做的:

我的模特

namespace WindowsFormsApplication1
{
    #region

    using System;
    using System.Reactive.Linq;

    using ReactiveUI;

    #endregion

    public class ClockModel : ReactiveObject
    {
        #region Fields

        private DateTime currentDateTime;

        #endregion

        #region Constructors and Destructors

        public ClockModel() { Observable.Interval(TimeSpan.FromSeconds(1)).Subscribe(s => this.CurrentDateTime = DateTime.Now); }

        #endregion

        #region Public Properties

        public DateTime CurrentDateTime
        {
            get { return currentDateTime; }
            set { this.RaiseAndSetIfChanged(ref currentDateTime, value); }
        }

        #endregion
    }
}

我唯一的表单

using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        readonly ClockModel model = new ClockModel();
        public Form1()
        {
            InitializeComponent();
            this.label1.DataBindings.Add("Text", model, "CurrentDateTime");
        }
    }
}

它确实有效,但我不会因为它们的字符串名称引用每一侧的属性而感到兴奋。有没有更好的方法来实现这一目标?

更新1

鉴于this extension

public class NameOf<T>
{
    public static string Property<TProp>(Expression<Func<T, TProp>> expression)
    {
        var body = expression.Body as MemberExpression;
        if (body == null)
            throw new ArgumentException("'expression' should be a member expression");
        return body.Member.Name;
    }
}

这种形式比上一种形式更令人满意吗?

this.label1.DataBindings.Add(NameOf<Form1>.Property(e => e.label1.Text), model, NameOf<ClockModel>.Property(p => p.CurrentDateTime));

更新2

另一个扩展名:

public static class Extensions
{
    public static string GetPropertyName<T,TProp>(this T obj, Expression<Func<T, TProp>> expression)
    {
        var body = expression.Body as MemberExpression;
        if (body == null)
            throw new ArgumentException("'expression' should be a member expression");
        return body.Member.Name;
    }
}

现在我可以使用:

this.label1.DataBindings.Add(this.GetPropertyName(e => e.label1.Text), model, model.GetPropertyName(p => p.CurrentDateTime));

或者这个:

this.label2.DataBindings.Add(this.label2.GetPropertyName(e => e.Text), model, model.GetPropertyName(p => p.Ticks));

我开始喜欢这个,但其他人怎么看待这三种方法中的任何一种?

从技术上讲,表格变成了视图和控制器或演示者,而模型仍然是分开的,并且不了解其消费者。这会是首选方法吗?

更新3

这可能会使一些纯粹主义者心脏病发作... 基于Paul Betts的建议:

namespace WindowsFormsApplication1
{
    #region

    using System.Windows.Forms;

    using ReactiveUI;

    #endregion

    public partial class Form1 : Form, IViewFor<ClockModel>
    {
        #region Constructors and Destructors

        public Form1()
        {
            InitializeComponent();
            this.ViewModel = new ClockModel();
            this.Bind(ViewModel, vm => vm.CurrentDateTime, v => v.label1.Text);
            this.Bind(ViewModel, vm => vm.Ticks, v => v.label2.Text);
        }

        #endregion

        #region Public Properties

        public ClockModel ViewModel { get; set; }

        #endregion

        #region Explicit Interface Properties

        object IViewFor.ViewModel
        {
            get { return ViewModel; }
            set { ViewModel = value as ClockModel; }
        }

        #endregion
    }
}

有趣的行为变化:在更新3之前,时间显示为秒。我只能说这是由于第三种方法中使用的默认ReactiveUI转换器。我必须要了解更多。

public class DateTimeStringConverter : IBindingTypeConverter
{
    public int GetAffinityForObjects(Type fromType, Type toType) { return 1; }

    public bool TryConvert(object @from, Type toType, object conversionHint, out object result) { 
        result = ((DateTime)@from).ToString("F");
        return true;
    }
}

我喜欢这种方法的优雅。

还有其他意见吗?

1 个答案:

答案 0 :(得分:2)

最简单的方法是使用ReactiveUI绑定 - 在表单上实现IViewFor<TViewModel>,然后您将获得几个新方法,例如BindOneWayBind

查看https://github.com/reactiveui/ReactiveUI/blob/docs/docs/basics/bindings.md了解详情