C#TabControl手动触发DrawItem的实现

private void tabControl1_DrawItem(object sender, DrawItemEventArgs e)
{
    //标签header的背景
    for (int i = 0; i < tabControl1.Tabpages.Count; i++)
    {
        e.Graphics.FillRectangle(Brushes.White, (sender as TabControl).GetTabRect(i));
    }
    //tabControl背景
    e.Graphics.FillRectangle(Brushes.White, (sender as TabControl).ClientRectangle);
}

private void ReDrawItem()
{
    Graphics g = Graphics.FromHwnd(tabControl1.Handle);
    //tabPage标签header的背景
    for (int i = 0; i < tabControl1.TabPages.Count; i++)
    {
        g.FillRectangle(Brushes.White, tabControl1.GetTabRect(i));
    }
    //tabControl背景
    g.FillRectangle(Brushes.White, tabControl1.ClientRectangle);
}