在表单之间共享父变量 [英] sharing parent variable between forms

问题描述

表单A打开表单B，表单A.visible = false;

form A opens form B, and form A.visible = false;

表单 A 有一个公共 int 变量，我需要表单 B 中的控件才能访问和修改此变量.是否可以这样做，因为通过构造函数传递值只是一种方法！

form A has a public int variable and I need controls in form B to be able to access and modify this variable. could this be done as passing the value through the constructor is only one way!

所以如果可以做到，如果表单 A 不可见，是否仍然可以访问该值?

and so if it could be done, if form A is not visible could the value still be accessed?

(表单 b 不应该是对话框！)

(form b is not supposed to be dialog!)

非常感谢！

我实际上不太明白解释.到目前为止是这样的:

edited: I do not quite get the explanations actually. so far it is like that:

形式a:

    //in global space
    public int temp = 123;

    //in form_load event
    Form setup = new setup();
    setup.Show();
    this.Visible = false;

在表单设置中:

    //in form_load event
    textBox1.text = temp.toString();

    //in button_press event
    form a.temp = "456";

我希望我已经清楚地解释了我的立场！

I hope I have explained my stance clearly!

推荐答案

首先，在表单A类型的表单B中拥有成员字段:

First, have member field in form B of type form A:

private FormA parent;

其次，在表单 B 中有这样的构造函数:

Second, have such constructor in form B:

public FormB(FormA parent)
    : this()
{
    this.parent = parent;
}

现在，当您创建表单 B 的实例时，将引用传递给正在运行的表单 A 实例:

Now when you create instance of form B, pass reference to the running form A instance:

FormB formB = new FormB(this);
formB.Show();

并且您可以通过 parent 字段访问公共属性，例如

And you can access the public property through the parent field e.g.

//inside Form B code..
public Foo()
{
    parent.PUblicProp = "Hello";
}

这篇关于在表单之间共享父变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！