richTextBox - 添加文本和表格

Question

i want to add formatted text and table to a richTextBox.

For this I use these codes:

Text:

richTextBox1.SelectionFont = new Font("Maiandra GD", 30, FontStyle.Bold);
richTextBox1.SelectionColor = Color.Red;
richTextBox1.SelectionIndent = 0;
richTextBox1.AppendText("text text text");

And the table:

StringBuilder tableRtf = new StringBuilder();

tableRtf.Append(@"{\rtf1\fbidis\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 Microsoft Sans Serif;}}");
for (int j = 0; j <5; j++)
{
    tableRtf.Append(@"\trowd");
    tableRtf.Append(@"\cellx2500" + "  ghhghgjghjghjhggjh");
    tableRtf.Append(@"\intbl\cell");
    tableRtf.Append(@"\cellx10000\intbl\cel");
    tableRtf.Append("   " + "sdfsdfs" + @"\intbl\clmrg\cell\row");
}

tableRtf.Append(@"\pard");
tableRtf.Append(@"}");
richTextBox1.Rtf=tableRtf.ToString();

But the

richTextBox1.Rtf=tableRtf.ToString();

kills the previous contents.

How can I make compatible them?

---

It is not a duplicate because I want two thing:

1) add formatted text to richTextBox this way:

richTextBox1.SelectionFont = new Font("Maiandra GD", 30, FontStyle.Bold);
richTextBox1.SelectionColor = Color.Red;
richTextBox1.AppendText("text text text");

It is well readable and I can modify easily.

2) And I want to add tables.

So the structure:

text text text text text text text text text text

|TABLE|

text text text text text text text text text text text text text text text

|TABLE|

etc.

But I don't know how can I apply tables without losing previous contents?

Answer 1

What you need to do is to dissect the rtf codes into the headers and the bodies.

The table body starts with the loop and keeping the \par is surely a good idea.

But you must neither replace the old text nor simply append the body to the end.

Instead you need to insert it before the last curly ! This is because that last curly marks the end of the whole rtf code and anything after it will be ignored!

This was simple.

For a full solution you also will want to combine the headers.

This is a lot more work and writing it all out would go beyond an SO answer.

But the basic principle is simple:

You need to understand the things your table header adds to the things already in the primal header.

The most common things are a font table and a color table .

So if you want to use one or more different fonts in the appended table you need to do this:

• add them to the font table with a new font index, eg as \f1\fnil Consolas; after the previous semicolon.
• use it by changing the loop to include the new font right after the first \intbl table-paragraph-formatting control word: \intbl\f2\fs24 ghhghgjghjghjhggjh .
• repeat as needed if you want to use different fonts in the table.
• add a cfN font color selector, if you want to.

The same idea will also work for the color table. It doesn't have a explicit indexing, so order matters; all colors are appended, each with a semicolon at the end:

{\colortbl ;\red255\green0\blue0;\red25\green0\blue220;}

..adds a blue color to the red from the formatted text.

You see, this is work and takes some effort and preparations.

You can find the full rtf specs here.

Here is a screenshot of playing a little with the rtf..:

Note that the parts of table header was created by the control; you may want to use a dummy control for this or maybe you can figure out which parts you need and which are not necessary..

Update: Here is a 'appending rtf for dummies' version:

tableRtf.Append(@"{\fonttbl{\f0\fnil\fcharset0 Courier;}}");
for (int j = 0; j <5; j++)
{
    tableRtf.Append(@"\trowd");
    tableRtf.Append(@"\cellx2500" + "  ghhghgjghjghjhggjh");
    tableRtf.Append(@"\intbl\cell");
    tableRtf.Append(@"\cellx10000\intbl\cel");
    tableRtf.Append("   " + "sdfsdfs" + @"\intbl\clmrg\cell\row");
}

tableRtf.Append(@"\pard");
tableRtf.Append(@"}");

string rtf1 = richTextBox1.Rtf.Trim().TrimEnd('}');
string rtf2 = tableRtf.ToString();
richTextBox1.Rtf  = rtf1 + rtf2;

Note that the font table inserted before the table body does work! But make sure not to add the rtf-start tag!!