使用从主窗体启动的子窗体上的变量更新主窗体上的文本框 [英] Updating textbox on mainform with a variable on a child form that is launched from main form

问题描述

我有一个 Windows 窗体应用程序.主窗体有一个文本框和一个用于启动另一个窗体的按钮.当另一个表单启动时，两个表单都在屏幕上(但启动的表单是模态的).子窗体有一个文本框和按钮，当按下按钮时，我希望主窗体(父窗体)上的文本框更新为子窗体上文本框中的值.

I have a windows form app. The main form has a textbox, and a button to launch another form. When the other form is launched, both forms are on screen (but the launched form is modal). The child form has a textbox and button, and when the button is pressed, I want the textbox on the main form (the parent) to be updated with the value in the textbox on the child form.

这个功能是如何实现的?

How is this functionality achieved?

推荐答案

理想情况下，您希望避免两种形式相互依赖，这可以通过接口来实现:

Ideally you want to keep both forms from being dependent on each other, this could be achieved with interfaces:

public interface IMainView
{
  public void UpdateValue(string val);
}

public interface IChildView
{
  public void Show(IMainView parent);
}

让主窗体实现 IMainView，子窗体实现 IChildView，父窗体调用 child.show(this)，子窗体调用 parent.UpdateValue(blah)；

have your main form implement IMainView and the child implement IChildView, the parent calls child.show(this) and the child calls parent.UpdateValue(blah);

希望这会有所帮助.

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