检查richTextBox是否滚动到最后

这里有一个选项可以获取滚动的位置和它的参数信息（我想你以后会自己弄明白的）。主要是了解SCROLLINFO结构。为此，我附上
了 SCROLLINFO 结构的 MSDN 描述的链接

获取滚动信息 MSDN

俄语也一样

    [DllImport("user32.dll")]
    private static extern bool GetScrollInfo(IntPtr hWnd, int nBar, ref SCROLLINFO ScrollInfo);

    [StructLayout(LayoutKind.Sequential)]
    public struct SCROLLINFO
    {
        public int cbSize;
        public int fMask;
        public int nMin;
        public int nMax;
        public int nPage;
        public int nPos;
        public int nTrackPos;
    }

    public enum ScrollBarType : uint
    {
        SbHorz = 0,
        SbVert = 1,
        SbCtl = 2,
        SbBoth = 3
    }

    private const int SB_VERT = 0x1;
    private const int SB_HORZ = 0x0;
    private const int SIF_PAGE = 0x2;
    private const int SIF_POS = 0x4;
    private const int SIF_RANGE = 0x1;
    private const int SIF_TRACKPOS = 0x10;
    private const int SIF_ALL = (SIF_RANGE | SIF_PAGE | SIF_POS | SIF_TRACKPOS);

    private void richTextBox1_VScroll(object sender, EventArgs e)
    {
        SCROLLINFO si = new SCROLLINFO();
        si.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(si);
        si.fMask = SIF_ALL;

        GetScrollInfo(richTextBox1.Handle, (int)ScrollBarType.SbVert, ref si);
        textBox1.Text = si.nPos.ToString();
        textBox2.Text = si.nMax.ToString();
        textBox3.Text = si.nPage.ToString();
    }