Declare some constants: private const int WM_SCROLL = 276; // Horizontal scroll private const int WM_VSCROLL = 277; // Vertical scroll private const int SB_LINEUP = 0; // Scrolls one line up private const int SB_LINELEFT = 0;// Scrolls one cell left private const int SB_LINEDOWN = 1; // Scrolls one line down private const int SB_LINERIGHT = 1;// Scrolls one cell right private const int SB_PAGEUP = 2; // Scrolls one page up private const int SB_PAGELEFT = 2;// Scrolls one page left private const int SB_PAGEDOWN = 3; // Scrolls one page down private const int SB_PAGERIGTH = 3; // Scrolls one page right private const int SB_PAGETOP = 6; // Scrolls to the upper left private const int SB_LEFT = 6; // Scrolls to the left private const int SB_PAGEBOTTOM = 7; // Scrolls to the upper right private const int SB_RIGHT = 7; // Scrolls to the right private const int SB_ENDSCROLL = 8; // Ends scroll Add a using reference using System.Runtime.InteropServices; Declare external SendMessage: [DllImport("user32.dll",CharSet=CharSet.Auto)] private static extern int SendMessage(IntPtr hWnd, int wMsg,IntPtr wParam, IntPtr lParam); Usage: If you have some textbox on the form... SendMessage( Control Handle , WM Scroll Message, (IntPtr) Scroll Command ,IntPtr.Zero); Scroll page up SendMessage(textBox1.Handle,WM_VSCROLL,(IntPtr)SB_PAGEUP,IntPtr.Zero); Scroll page down SendMessage(textBox1.Handle,WM_VSCROLL,(IntPtr)SB_PAGEDOWN,IntPtr.Zero);
The DataGridView control has 2 sub-controls, a VScrollBar and a HScrollBar. If you want to do a scroll over a DataGridView you have to send the WM_VSCROLL or WM_HSCROLL message to the DataGridView handle, with wParam as the SB_xxxx value you want, and lParam as the scrollbar handle.
Example:
public void ScrollControlDown(DataGridView dataGridView)
{
VScrollBar barraVertical = null;
foreach (Control c in dataGridView.Controls)
{
if (c is VScrollBar) barraVertical = (VScrollBar)c;
}
if (barraVertical != null)
{
SendMessage(dataGridView.Handle, WM_VSCROLL, (IntPtr)SB_LINEDOWN, barraVertical.Handle);
SendMessage(dataGridView.Handle, WM_VSCROLL, (IntPtr)SB_ENDSCROLL, barraVertical.Handle);
}
}
This method requires the DataGridView‘s ScrollBars property shows the scrollbar over you are going to do the programatical scroll. If you want to send WM_VSCROLL, ScrollBars property must be set to Both or Vertical. If you want to send WM_HSCROLL, ScrollBars propery must be set to Both or Horizontal.
c# sendmessage control to scroll
原文：http://www.cnblogs.com/wolly88/p/4454808.html