如何将附加本地对象变量传递给我的事件处理程序？

发布于 2024-11-01 15:59:12 字数 345 浏览 2 评论 0原文

我想将本地对象传递给事件处理程序。我怎样才能做到这一点？例如，如何在事件处理函数“hyperlinkButton_Click”中引用在下面的主函数中声明的“graphic”对象？

    void main()
    {
        Graphic graphic = new Graphic();

        hyperlinkButton.Click+=new RoutedEventHandler(hyperlinkButton_Click);
    }

    void hyperlinkButton_Click(object sender, EventArgs e)
    {

    }

原文

I want to a pass local object to the event handler. How can I do that? For example, how can I reference the "graphic" object, which is declared in the main function below, in the event handler function "hyperlinkButton_Click"?

    void main()
    {
        Graphic graphic = new Graphic();

        hyperlinkButton.Click+=new RoutedEventHandler(hyperlinkButton_Click);
    }

    void hyperlinkButton_Click(object sender, EventArgs e)
    {

    }

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柳若烟 2024-11-08 15:59:12

使用委托或 lambda 表达式。

hyperlinkButton.Click += (sender, e) => HandleGraphic(graphic, sender, e);

Use a delegate or a lambda expression.

hyperlinkButton.Click += (sender, e) => HandleGraphic(graphic, sender, e);

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晨敛清荷 2024-11-08 15:59:12

您可以尝试关闭 graphic 变量：

void main()
{
    Graphic graphic = new Graphic();

    hyperlinkButton.Click += (sender, e) => 
    {
        graphic.Blah(); 
    };
}

如果您最终需要手动删除事件处理程序，这不是一个好主意。或者，您可以将 graphic 设置为字段而不是局部变量。

You could try closing on the graphic variable:

void main()
{
    Graphic graphic = new Graphic();

    hyperlinkButton.Click += (sender, e) => 
    {
        graphic.Blah(); 
    };
}

This would not be a good idea if you eventually need to remove the event handler manually. Alternatively, you could make graphic a field instead of a local variable.

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笑红尘 2024-11-08 15:59:12

   void main()
    {
        Graphic graphic = new Graphic();
        hyperlinkButton.Tag = graphic;
        hyperlinkButton.Click+=new RoutedEventHandler(hyperlinkButton_Click);
    }

    void hyperlinkButton_Click(object sender, EventArgs e)
    {
       Graphic graphic =(sender as HyperlinkButton).Tag as Graphic;
    }

但不是好办法。

   void main()
    {
        Graphic graphic = new Graphic();
        hyperlinkButton.Tag = graphic;
        hyperlinkButton.Click+=new RoutedEventHandler(hyperlinkButton_Click);
    }

    void hyperlinkButton_Click(object sender, EventArgs e)
    {
       Graphic graphic =(sender as HyperlinkButton).Tag as Graphic;
    }

but not good way.

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