winform DataGridView重绘滚动条

对于winform中的DataGridView控件，重绘滚动条的方式如下：

1. 创建一个新的滚动条，使用CreateWindow函数，指定ScrollBar类和style为WS_CHILD | WS_VISIBLE | SBS_VERT | SBS_RIGHTALIGN。

2. 让新创建的滚动条关联到DataGridView的滚动条事件，使用SetScrollInfo函数设置滚动条信息，包括滚动条范围，当前位置和页大小等等。

3. 在DataGridView的Paint事件中重绘控件，包括滚动条和数据区域。

代码示例：

private const uint WM_HSCROLL = 0x0114;
private const uint WM_VSCROLL = 0x0115;
private const uint SB_THUMBTRACK = 5;

[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

IntPtr hScrollBar;

private void dataGridView1_Resize(object sender, EventArgs e)
{
    int borderWidth = SystemInformation.Border3DSize.Width;
    int x = dataGridView1.Width - SystemInformation.VerticalScrollBarWidth - borderWidth;
    int y = dataGridView1.Top + borderWidth;
    int width = SystemInformation.VerticalScrollBarWidth;
    int height = dataGridView1.Height - 2 * borderWidth;

    if (hScrollBar == IntPtr.Zero)
    {
        hScrollBar = CreateWindow("SCROLLBAR", null, WS_CHILD | WS_VISIBLE | SBS_VERT | SBS_RIGHTALIGN, x, y, width, height, dataGridView1.Handle, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
        SetScrollInfo(hScrollBar, SIF_ALL, 0, 100, 10, 0);
    }
    else
    {
        MoveWindow(hScrollBar, x, y, width, height, true);
    }
}

private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
{
    IntPtr wParam;

    if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
    {
        wParam = (IntPtr)(SB_THUMBTRACK << 16) | (IntPtr)(e.NewValue & 0xFFFF);
        SendMessage(dataGridView1.Handle, WM_HSCROLL, wParam, IntPtr.Zero);
    }
    else if (e.ScrollOrientation == ScrollOrientation.VerticalScroll)
    {
        wParam = (IntPtr)(SB_THUMBTRACK << 16) | (IntPtr)(e.NewValue & 0xFFFF);
        SendMessage(hScrollBar, WM_VSCROLL, wParam, IntPtr.Zero);
    }

    dataGridView1.Invalidate();
}

private void dataGridView1_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.FillRectangle(Brushes.White, dataGridView1.ClientRectangle);

    IntPtr hDC = e.Graphics.GetHdc();
    SendMessage(dataGridView1.Handle, WM_PRINTCLIENT, hDC, PRF_CLIENT);
    e.Graphics.ReleaseHdc(hDC);

    if (hScrollBar != IntPtr.Zero)
    {
        hDC = e.Graphics.GetHdc();
        SendMessage(hScrollBar, WM_PRINTCLIENT, hDC, PRF_CLIENT);
        e.Graphics.ReleaseHdc(hDC);
    }
}