c# - 从.Hide() 改成.Show() 的窗体无法最大化，为什么？

Question

我编写了一个隐藏或显示所有应用程序形式(包括子形式)的方法。代码如下:

public enum FormState
{
    Show ,
    Hidden,
    Enable,
    Disable
}

private void SetAllFormsState(FormState formState)
{
    FormCollection forms = Application.OpenForms;
    FormWindowState formWinState;
    bool state;

    if (formState == FormState.Show)
    {
        formWinState = FormWindowState.Normal;
        state = true;
    }
    else if (formState == FormState.Hidden)
    {
        formWinState = FormWindowState.Minimized;
        state = false;
    }
    else
    {
        throw new ArgumentNullException("invalid flag");
    }

    for (int i = forms.Count - 1; i >= 0; i--)
    {
        Form form = forms[i];
        form.WindowState = formWinState;

        if (state)
        {
            form.Show();
        }
        else
        {
            form.Hide();
        }
    }
}

但是当我再次调用表单时:

SetAllFormsState(FormState.Show);

只能选择父窗体。子窗体显示在窗口/任务栏中，但似乎被窗口“锁定”，无法最大化或更改为正常样式。我该如何解决？

Answer 1

尝试在Show() 和Hide() 方法调用之后 设置form.WindowState:

for (int i = forms.Count - 1; i >= 0; i--)
{
  Form form = forms[i];
  if (state)
  {
    form.Show();
  }
  else
  {
    form.Hide();
  }
  form.WindowState = formWinState;
}