c# - 顶级控件不能添加到控件

Question

如何在主窗体中加载面板内的其他窗体。

我正在尝试类似的东西

private void frmInitialEntryBooks_Load(object sender, EventArgs e)
{
    frmSujbect objForm = new frmSujbect();
    pnl.Controls.Add(objForm);
    objForm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
    objForm.Dock = DockStyle.Fill;
    objForm.Show();
}

但它在 pnl.Controls.Add(objForm); 行抛出异常 Top-level control cannot be added to a control

Answer 1

使用这个:

private void frmInitialEntryBooks_Load(object sender, EventArgs e)
{
    frmSujbect objForm = new frmSujbect();
    objForm.TopLevel = false;
    pnl.Controls.Add(objForm);
    objForm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
    objForm.Dock = DockStyle.Fill;
    objForm.Show();
}

您缺少 objForm.TopLevel = false;