C＃ - 从子窗口返回变量父窗口在WPF [英] C# - Return variable from child window to parent window in WPF

问题描述

我有一个叫做Form1的一个主窗口。在Form1我有一个按钮，当按下它，它就会打开窗口2（form2.ShowDialog（））。在窗口2我有一个所谓的检查按钮。当用户点击检查它应该做一些验证，如果成功创建了一个String对象，并使其返回到Form1。任何想法如何实现这一点？我不想回，当用户关闭窗口任何事情。

I have a main window called form1. in form1 I have a button, when it is pressed it will open form2 (form2.ShowDialog()). In form2 I have a button called "Check". When the user clicks on "Check" it should do some validation and if successful creates a string object and return it to form1. Any Ideas on how to implement this? I don't want to return anything when the user closes the window.

推荐答案

在你的第二个窗口中创建一个事件，有该事件的委托的参数包含你要传递的任何信息：

Create an event in your second window, have the parameters of the event's delegate contain whatever information you want to pass:

public class Popup : Window
{
    public event Action<string> Check;

    public void Foo()
    {
        //fire the event
        if (Check != null)
            Check("hello world");
    }
}

然后在主窗口可以订阅该事件做它想要的信息：

Then the main window can subscribe to that event to do what it wants with the information:

public class Main : Window
{
    private Label label;
    public void Foo()
    {
        Popup popup = new Popup();
        popup.Check += value => label.Content = value;
        popup.ShowDialog();
    }
}

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