c# - 在任务栏中最小化表单时将其置于最前面

Question

有没有办法将已经最小化到 taksbar 的表单置于最前面？我尝试了以下代码但没有成功:

        filterForm.Show();
        filterForm.Activate();
        filterForm.BringToFront();

P.S:这个表单是从另一个表单调用的，用户在其中做一些事情然后可以最小化它。我只想一次打开此表单的一个实例，因此第二次用户单击按钮以显示我正在检查表单是否已显示的表单，如果显示，我希望它在前面:

public FilterForm filterForm;
public bool IsFilterFormActive;

private void tsOpenFilerForm_Click(object sender, EventArgs e)
{
    if (!IsFilterFormActive)
    {
        filterForm = new FilterForm();
        filterForm.FormClosing += delegate {
                                               IsFilterFormActive = false;
                                            };
        IsFilterFormActive = true;
        filterForm.Show();
    }
    else
    {
        filterForm.Show();
        filterForm.Activate();
        filterForm.BringToFront();
    }
}

Answer 1

您正在泄漏表单实例，最好的办法是在关闭时将其设置回 null。然后你也不需要 bool 。像这样:

    FilterForm filterForm;

    private void tsFilterForm_Click(object sender, EventArgs e) {
        if (filterForm == null) {
            filterForm = new FilterForm();
            filterForm.FormClosed += delegate { filterForm = null; };
            filterForm.Show();
        }
        else {
            filterForm.WindowState = FormWindowState.Normal;
            filterForm.Focus();
        }
    }