如何在另一个表单上实时使按钮更改颜色

Question

如何从“主题”表单实时更改mainUI（Form）的颜色？我试过简单，但不会实时更新。这是我使用的代码

MainUI：

private void button7_Click(object sender, EventArgs e)
    {
        Themes theme = new Themes();
        theme.Show();
    }

主题：

private void button4_Click(object sender, EventArgs e)
    {
        MainUI n = new MainUI();
        n.BackColor = Color.FromArgb(255, 255, 255);           

    }

Answer 1

主题

private MainUI _mainUI;

public Themes(MainUI mainUI)
{
   _mainUI = mainUI
}

private void button4_Click(object sender, EventArgs e)
{
    _mainUI.BackColor = Color.FromArgb(255, 255, 255);           
}

MainUI

private void button7_Click(object sender, EventArgs e)
{
    Themes theme = new Themes(this);
    theme.Show();
}

---

如果您想访问其他任何内容，例如按钮，则必须将其设置为public。但是，您也可以创建方法来执行相同的操作

MainUI

public void DoOotherStuff()
{
    // are your basses belong to us
}

主题

private void button4_Click(object sender, EventArgs e)
{
    _mainUI.BackColor = Color.FromArgb(255, 255, 255); 
    _mainUI.DoOotherStuff();          
}