Question

For the first time ever, I’m investigating RichTextBox controls in C# Windows forms. I know I need this control in my app as TextBox is too simple for my needs.

I have the following code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace _19_richtextbox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void richTextBoxHome_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyValue == (char)(Keys.Return))
            {
                richTextBoxChat.AppendText("Home:" + richTextBoxHome.Text + "\n");
                richTextBoxHome.Clear();
            }
        }
    }
}

For the moment I just want whatever is typed in one RichTextBox to be displayed on the other RichTextBox on hitting Return.

The issue is that everytime I hit Return, the data is being transfered to the other control but the first control is left with a carriage return before the cursor. This happens everytime I hit Return. Both the controls accept multiline input. How do I make it stop doing this?

---

i would like a way to make the “Home:” part in bold.

i have found very little info on this on my searches. the following are the only actual code that i could understand.

rtb1.Rtf = @"{\rtf1\ansi {\b hello} {\i World}}" ; 
richTextBox1.Rtf = @"{\rtf1\ansi This is in \b bold\b0.}";

---

im not sure how to proceed with this info. i just want the richtextbox to display “Home:” and “Away:” in bold and be able to handle URLs in text.

please advise what should i specify when searching this potic on google or any reference your could think of would be of great help.

thank you again for taking interest.

---

i have made progress on my issue and thought to share.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace _19_richtextbox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void richTextBoxHome_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)(Keys.Enter))
            {
                e.Handled = true;

                // richTextBoxChat.Rtf = @"{\rtf1 \b Home: \bO}" + @richTextBoxHome;

                // do not delete next 2 lines
                //string test = @"{\rtf1 \b Home: \b0";
                //test = test + richTextBoxHome.Rtf + "}";

                string chatBuffer = richTextBoxChat.Rtf;

                string buffer = @"{\rtf1";
                buffer = buffer + chatBuffer;

                buffer = buffer + @"\b Home:\b0";

                buffer = buffer + richTextBoxHome.Rtf + "}";


               // MessageBox.Show(buffer);
                richTextBoxChat.Rtf = buffer;
                //do not delete the following 2 lines
                //richTextBoxChat.AppendText("Home:" + richTextBoxHome.Text);
                richTextBoxHome.Clear();
            }
        }

    }
}

---

just need to figure out how to get rid of the new lines/carriage returns in the text.

any tips most welcome.

thanks.

---

that did not workout so well. ended up using the below instead.

            this.richTextBoxChat.SelectionFont = new Font(this.richTextBoxChat.Font.FontFamily, this.Font.Size, FontStyle.Bold);
            richTextBoxChat.AppendText("Home: ");
            this.richTextBoxChat.SelectionFont = new Font(this.richTextBoxChat.Font.FontFamily, this.Font.Size, FontStyle.Regular);
            richTextBoxChat.AppendText(richTextBoxHome.Text);
            richTextBoxChat.ScrollToCaret();
            richTextBoxHome.Clear();

Answer 1

You can set the event to handled to prevent further processing of the return keydown event

Try this:

    private void richTextBoxHome_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyValue == (char)(Keys.Return))
        {
            richTextBoxChat.AppendText("Home:" + richTextBoxHome.Text + "\n");
            richTextBoxHome.Clear();

            e.Handled = true;
            e.SuppressKeyPress = true;

        }
    }

Edit: added e.SuppressKeyPress = true; Cory Charlton pointed this out in his post.

Edit: also, as others have mentioned, use the KeyPress event handler, so if someone holds down enter/return the event is triggered over and over again.
an example of the usage is as follows:

    private void richTextBoxHome_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (e.KeyChar.Equals((Char) Keys.Enter))
        {
            richTextBoxChat.AppendText("Home:" + richTextBoxHome.Text + "\n");
            richTextBoxHome.Clear();

            e.Handled = true;
        }
    }

Edit: Also, there is a Property you can set on the RichTextBox to not allow MultiLine strings to be entered into the textbox. This does pose a problem when pasting content with multiple lines, it will only take the first line.

For Bold words:
You can change the SelectionFont of the RichTextBox to set it’s font attributes:

    private readonly Font BoldSelectionFont = new Font("Arial", 9.0f, FontStyle.Bold);
    private readonly Font RegSelectionFont = new Font("Arial", 9.0f, FontStyle.Regular);

...
                richTextBoxChat.SelectionFont = BoldSelectionFont;
                richTextBoxChat.AppendText("Home: ");
                richTextBoxChat.SelectionFont = RegSelectionFont;
                richTextBoxChat.AppendText(richTextBoxHome.Text + "\n");
...