从 Form2 访问 Form1 控件 [英] Access Form1 controls from Form2

问题描述

有两种形式-Form1 &Form2.Form1 有一个按钮(btnNew)，它在单击时打开 Form2，并被禁用.我需要再次启用该按钮，只有在 Form2 关闭时.用户还需要同时使用 Form1.此代码不会再次启用该按钮.我在哪里失踪了.

在 Form1 中:

Have two forms-Form1 & Form2.Form1 has a button(btnNew),which opens Form2 on click, and is disabled.I need to enable the button again, only when Form2 is closed.User needs to use Form1 also simultaneously.This code is not enabling the button again. Where am I missing.

In Form1:

private void btnNew_Click_1(object sender, EventArgs e)
  {   
    Form2 f2 = new Form2();
    f2.Show();
    btnNew.Enabled = false;
  }   
public void EnableButton()
 {
    btnNew.Enabled = true;
 }

在 Form2 中:

private void Form2_FormClosing(object sender, FormClosingEventArgs e)
  {
    Form1 f1 = new Form1();
    f1.EnableButton();
  }

推荐答案

从实例化它的类 (Form1) 中订阅您的 Form2 关闭事件.

Subscribe to your Form2 closing event from within the class that is instantiating it (Form1).

private void btnNew_Click_1(object sender, EventArgs e)
  {   
    Form2 f2 = new Form2();
    f2.Closing += f2_Closing;
    f2.Show();
    btnNew.Enabled = false;

  }   

public void f2_Closing(object sender, FormClosingEventArgs e)
{
   this.EnableButton();
}

public void EnableButton()
 {
    btnNew.Enabled = true;
 }

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