winform中richTextBox滚动条问题

Question

如何使winform中richTextBox滚动条自己向下按一定的速度进行移动？
在线等高手解答

Answer 1

[DllImport("user32")]
        private static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
        private void timer1_Tick(object sender, EventArgs e)
        {
            SendMessage(this.richTextBox1.Handle, 0x0115, 1, 0);
        }

Answer 2

using System.Runtime.InteropServices;
timer控件的时间间隔自己设置一下就好了

Answer 3

不想用SendMessage()int lineIndex;
private void timer1_Tick(object sender, EventArgs e)
        {            int charIndex = this.richTextBox1.GetFirstCharIndexFromLine(lineIndex++);
            this.richTextBox1.Select(charIndex, 0);
            this.richTextBox1.ScrollToCaret();
            
            int lineCount = this.richTextBox1.GetLineFromCharIndex(this.richTextBox1.TextLength - 1);
            if (lineIndex > lineCount)
            {
                timer1.Stop();
            }
}