如何在 WPF 中为用户控件创建用户定义（新）事件？一个小例子
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How to create user define (new) event for user control in WPF ?one small example
提问by Kiranaditya
I have one UserControlin which I am using a Canvas, and in that Canvas one Rectangle. I want to create a click event for that user control (Canvas and Rectangle) which I then want to use in the main window.
我有一个UserControl，我在其中使用了一个Canvas，在那个画布中使用了一个矩形。我想为该用户控件（画布和矩形）创建一个单击事件，然后我想在主窗口中使用它。
The question is: I want to create a new click event for the UserControl. How to do it? Kindly show little example or the code.
问题是：我想为UserControl. 怎么做？请展示小例子或代码。
回答by Blachshma
A briefexample on how to expose an event from the UserControl that the main window can register:
甲简要如何从该用户控件，主窗口可以注册暴露事件例如：
In your UserControl:
在您的用户控件中：
1 . Add the following declaration:
1 . 添加以下声明：
public event EventHandler UserControlClicked;
2 . In your UserControl_Clicked event raise the eventlike this:
2 . 在您的 UserControl_Clicked 事件中引发这样的事件：
private void UserControl_MouseDown(object sender, MouseButtonEventArgs e)
{
if (UserControlClicked != null)
{
UserControlClicked(this, EventArgs.Empty);
}
}
In your MainWindow:
在您的 MainWindow 中：
Your usercontrol will now have a UserControlClickedevent which you can register to:
您的用户控件现在将有一个UserControlClicked您可以注册的事件：
<local:UserControl1 x:Name="UC" UserControlClicked="UC_OnUserControlClicked" />
回答by DAkbariSE
i find this easier for passing value to handler:
我发现将值传递给处理程序更容易：
public event Action<string> onUserCodeFetched;
private void btnEnterClicked(object sender, RoutedEventArgs e)
{
onUserCodeFetched(PersonellCode.Text);
PersonellCode.Text = "";
}
