F#/WPF事件绑定 [英] F#/WPF event binding

问题描述

我在徘徊是否有一种方法可以将XAML中定义的事件挂接到成员的F#函数上?当然，我可以用图解的方式来做，但这有点不方便.

I am wandering if there is a way of hooking an event defined in XAML to a F# function of member ? Of course, I could do it diagrammatically but it is kind of inconvenient.

推荐答案

我想的问题是，是否可以使用XAML标记将F#成员指定为事件处理程序:

I suppose the question is whether you can specify F# member as an event handler using XAML markup:

<Button x:Name="btnClick" Content="Click!" Click="button1_Click" />

据我所知，答案是否.

在C#中工作的方式是事件处理程序的注册是由设计人员生成的C#代码(部分类)完成的(您可以在obj目录中的名为MainForm.g.cs的文件中看到). F#对WPF设计器没有任何直接支持，因此它无法为您生成此代码.您必须编写代码来手动附加事件处理程序(但这很容易).

The way this works in C# is that the registration of event handler is done in C# code (partial class) generated by the designer (you can see that in the obj directory in files named e.g. MainForm.g.cs). F# doesn't have any direct support for WPF designer, so it cannot generate this for you. You'll have to write the code to attach event handlers by hand (but that's quite easy).

伦敦关于Silverlight的讨论中有一些示例.您可以实现?运算符以很好地访问XAML元素:

I have some examples in my London talk about Silverlight. You can implement the ? operator to get nice access to the XAML elements:

 type MainPage() as this =
   inherit UserControl()
   let uri = new System.Uri("/App;component/MainPage.xaml", UriKind.Relative)
   do Application.LoadComponent(this, uri)

   // Get button using dynamic access and register handler
   let btn : Button = this?btnClick
   do btnClick.Click.Add(fun _ -> (* ... *))

我使用的?运算符声明是:

The ? operator declaration that I used is:

let (?) (this : Control) (prop : string) : 'T = // '
  this.FindName(prop) :?> 'T

这篇关于F#/WPF事件绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！