如何将控件的属性设置为 xaml 中函数的地址？
我有一个具有“Filter”属性的控件，该属性需要一个定义如何过滤控件内容的函数。到目前为止，我在后面的代码中设置过滤器，如下所示：
MyControl.Filter = AddressOf Filters.MyFilter
在此示例中，MyFilter 是 Filters 类中的共享函数，具有以下签名：
公共共享函数 MyFilter(ByVal obj As Object, ByVal text As String) As Boolean
我想在 xaml 中设置它。我正在考虑将 Filters.MyFilter 设置为静态资源并这样设置：
...Filter="{StaticResource myFilter}"/>
但我无法将 Filters.MyFilter 设置为静态资源。关于如何实现这一目标有什么想法吗？
谢谢，
I have a control that has a "Filter" property that expects a function that defines how the contents of the control should be filtered. so far i am setting the filter in code behind as such:
MyControl.Filter = AddressOf Filters.MyFilter
In this example MyFilter is a shared function in the Filters class with the following signature:
Public Shared Function MyFilter(ByVal obj As Object, ByVal text As String) As Boolean
I would like to set this in xaml. I was thinking of setting the Filters.MyFilter as a static resource and setting it that way:
...Filter="{StaticResource myFilter}"/>
but i cant set Filters.MyFilter as a static resource. Any ideas on how to achieve this?
Thanks,
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您不能直接执行此操作。除了作为事件处理程序之外，XAML 不提供引用函数的方法。
您可以通过创建一个具有谓词类型属性的对象来间接做到这一点：（
请原谅 C# 主义——我不太熟悉用于返回函数的 VB 语法。我认为它类似于
Return AddressOf Filters.MyFilter但我可能是错的。）现在您可以将 FilterOMatic 实例化为资源，并通过与该资源的绑定引用其 FilterProc 属性：
You cannot do this directly. XAML doesn't provide a way to refer to functions, other than as event handlers.
You can do it indirectly, by creating an object that has a property of predicate type:
(Pardon the C#-ism -- I'm not too familiar with the VB syntax for returning functions. I think it would be something like
Return AddressOf Filters.MyFilterbut I may be wrong.)Now you can instantiate the FilterOMatic as a resource and reference its FilterProc property via a binding to that resource: