所以我的基本建议是：不要这样做至少对于基本的窗体控件,如TextBox或RichTextBox.您可能会有更多的运气尝试从.NET远程访问运行的办公室,但这是一个完全不同的蠕虫病毒.

如果你真的坚持要去SetCaretPos路线,这里有一些代码可以让你运行一个基本的版本,你可以改进：

// import the functions (which are part of Win32 API - not .NET)
[DllImport("user32.dll")] static extern bool SetCaretPos(int x,int y);
[DllImport("user32.dll")] static extern Point GetCaretPos(out Point point);

public Form1()
{
    InitializeComponent();

    // target position to animate towards
    Point targetCaretPos; GetCaretPos(out targetCaretPos);

    // richTextBox1 is some RichTextBox that I dragged on the form in the Designer
    richTextBox1.TextChanged += (s,e) =>
        {
            // we need to capture the new position and restore to the old one
            Point temp;
            GetCaretPos(out temp);
            SetCaretPos(targetCaretPos.X,targetCaretPos.Y);
            targetCaretPos = temp;
        };

    // Spawn a new thread that animates toward the new target position.
    Thread t = new Thread(() => 
    {
        Point current = targetCaretPos; // current is the actual position within the current animation
        while (true)
        {
            if (current != targetCaretPos)
            {
                // The "30" is just some number to have a boundary when not animating
                // (e.g. when pressing enter). You can experiment with your own distances..
                if (Math.Abs(current.X - targetCaretPos.X) + Math.Abs(current.Y - targetCaretPos.Y) > 30)
                    current = targetCaretPos; // target too far. Just move there immediately
                else
                {
                    current.X += Math.Sign(targetCaretPos.X - current.X);
                    current.Y += Math.Sign(targetCaretPos.Y - current.Y);
                }

                // you need to invoke SetCaretPos on the thread which created the control!
                richTextBox1.Invoke((Action)(() => SetCaretPos(current.X,current.Y)));
            }
            // 7 is just some number I liked. The more,the slower.
            Thread.Sleep(7);
        }
    });
    t.IsBackground = true; // The animation thread won't prevent the application from exiting.
    t.Start();
}