RichTextBox自动高度

 private void richTextBox1_ContentsResized(object sender, ContentsResizedEventArgs e)
        {
            var richTextBox = (RichTextBox)sender;
            //    richTextBox.Width = e.NewRectangle.Width;
            int lineheight = richTextBox.Font.Height;
            int nHeight = lineheight;
            if (e.NewRectangle.Height < lineheight)
                nHeight = lineheight;
            else
                nHeight = e.NewRectangle.Height+ lineheight;
            richTextBox.Height = nHeight;
        }

网上找了好多办法，就这个最省事和简单，参考https://stackoverflow.com/questions/11906932/size-richtextbox-according-to-contents

Have you looked at the ContentsResized event? Add the following method to be called when the event fires:

private void richTextBox_ContentsResized(object sender, ContentsResizedEventArgs e)
{
    var richTextBox = (RichTextBox) sender;
    richTextBox.Width = e.NewRectangle.Width;
    richTextBox.Height = e.NewRectangle.Height;
}

When the RTF content is changed (using Rtf), the RichTextBox should be resized to match its contents. Make sure you also set the WordWrap property to false.

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I've tried it with your table example and it does appear to work (albeit with a little offset, which you could possibly solve by adding a few pixels of width to the adjusted size - not sure why that happens):

P.Brian.Mackey EDIT
This answer worked for me. To clarify, here's the final code including border fix:

    public static void Main()
    {
        string sInput = "hi\t bye\t\n";// one\t two\t\n";
        SIZE CharSize;
        Form form = new Form();
        RichTextBox rtfBox = new RichTextBox();
        rtfBox.ContentsResized += (object sender, ContentsResizedEventArgs e) =>
        {
            var richTextBox = (RichTextBox)sender;
            richTextBox.Width = e.NewRectangle.Width;
            richTextBox.Height = e.NewRectangle.Height;
            rtfBox.Width += rtfBox.Margin.Horizontal + SystemInformation.HorizontalResizeBorderThickness;
        };

        rtfBox.WordWrap = false;
        rtfBox.ScrollBars = RichTextBoxScrollBars.None;

        rtfBox.Rtf = @"{\rtf1\ansi\deff0{\fonttbl{\f0\fnil Arial;}}\viewkind4\uc1\trowd\trgaph100\cellx1000\cellx2000\pard\intbl\lang1033\f0\fs20  hi\cell  bye\cell\row\intbl  one\cell  two\cell\row\pard\par}";

        form.Controls.Add(rtfBox);
        form.ShowDialog();
    }

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