来自用户控件的 WPF 调用父方法
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WPF call method parent from usercontrol
提问by user1253414
I want to call a method from user control in WPF
我想从 WPF 中的用户控件调用一个方法
I′ve a Window with a list and I have a method that get this list.
我有一个带有列表的窗口，我有一个方法可以获取这个列表。
private ObservableCollection<int> _lst;
public MainWindow()
{
InitializeComponent();
getList();
}
public void getList()
{
_lst = List<int>();
}
In this page I use a usercontrol:
在这个页面中，我使用了一个用户控件：
UserControlAAA userControl = new UserControlAAA ();
gridDatos.Children.Add(userControl);
I want to do something like this inside of usercontrol:
我想在用户控件中做这样的事情：
Window win = Window.GetWindow(this);
win.getList();
but I can′t call win.getList();
但我不能调用 win.getList();
I want to call the method getList from my usercontrol, but I don′t know how to do it.
我想从我的用户控件中调用 getList 方法，但我不知道该怎么做。
回答by Adi Lester
You'll need to cast the Windowobject to the specific window type you're using - which in your case is MainWindow:
您需要将Window对象强制转换为您正在使用的特定窗口类型 - 在您的情况下是MainWindow：
MainWindow win = (MainWindow)Window.GetWindow(this);
win.getList();
However, it's not wise to have such coupling between the user control and the window it's hosted in, since that means you will only be able to use it in a window of type MainWindow. It would be better to expose a dependency property in the user control and bind the list to that property - this way the user control will have the data it requires and it will also be reusable in any type of window.
但是，在用户控件和它所在的窗口之间进行这种耦合是不明智的，因为这意味着您只能在类型为 的窗口中使用它MainWindow。最好在用户控件中公开依赖项属性并将列表绑定到该属性 - 这样用户控件将拥有它需要的数据，并且它也可以在任何类型的窗口中重用。
回答by Sebastian Xawery Wi?niowiecki
Solution from @Adi Lester is working but it break WPF coding ruler. Proper way of doing this is using event like in the linked answer below https://stackoverflow.com/a/19384953/3099317
来自@Adi Lester 的解决方案正在发挥作用，但它破坏了 WPF 编码标尺。这样做的正确方法是使用如下链接答案中的事件 https://stackoverflow.com/a/19384953/3099317
