C# 关闭另一个窗体时显示最小化窗体

当另一个窗体关闭或隐藏时，我如何显示一个以前最小化的窗体，而不实例化另一个窗体

private Form1 mainForm = null;
public Admin(Form callingForm)
{
   mainForm = callingForm as Form1;
   InitializeComponent();
}

private void button3_Click(object sender, EventArgs e)
{
   this.Hide();
   this.mainForm.BringToFront();
}

为什么这样不行？

试试看

private void button3_Click(object sender, EventArgs e)
{
   this.Hide();
   this.mainForm.WindowState = FormWindowState.Normal;
}

试试看

private void button3_Click(object sender, EventArgs e)
{
   this.Hide();
   this.mainForm.WindowState = FormWindowState.Normal;
}

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将此添加到BringToFront（）之前

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将此添加到BringToFront（）之前