CODEWITHSUNDEEP
c#richtextbox
Tom O
Tom O

Reputation: 1800

Rich Text Box - Bold

I know there are loads of "how to bolden text" questions on here, but none of the answers are helping, I think it may be that the Rich Text Box is being created at runtime.

I'm making a chat client, so I have a rich text box split up in lines and the messages are as follows: {Name}: {Message} \r\n

I want to bolden the name, I have tried many code examples, but this is the closest I've got to it working:

int length = textBox.Text.Length;
textBox.Text += roomChatMessage.from + ": " + roomChatMessage.text + "\r\n";
textBox.Select(length, roomChatMessage.from.Length);
textBox.SelectionFont = new Font(textBox.Font, FontStyle.Bold);

The first message, it works perfectly fine, the name is in bold. But when I add a second message, everything turns bold even though the second time round I'm selecting the start index (Which is this example is 37) but everything just turns bold, all the past messages too!

Any idea to what may cause this? Thanks in advance!

Upvotes: 20

Views: 60510

Answers (6)

3xGuy
3xGuy

Reputation: 2559

I know this is an old post, but I wanted to add this here as the MSDN Documentaion doesn't explain this very well. The property SelectionFont doesn't exist anymore at least in .Net 5

 RichTextBox.Selection.ApplyPropertyValue(FontWeightProperty, FontWeights.Bold);

Upvotes: 1

Jonesopolis
Jonesopolis

Reputation: 25370

Here's some code I used one time : 

var sb = new StringBuilder();
        sb.Append(@"{\rtf1\ansi");
        sb.Append(@"\b Name: \b0 ");
        sb.Append((txtFirstName.Text);
        sb.Append(@" \line ");
        sb.Append(@"\b DOB: \b0 ");
        sb.Append(txtDOBMonth.Text);
        sb.Append(@" \line ");
        sb.Append(@"\b ID Number: \b0 ");
        sb.Append(txtIdNumber.Text);
        sb.Append(@" \line \line ");
        sb.Append(@"}");

richTextBox.Rtf = sb.ToString();

if you append @"\rtf1\ansi" you can use \b and \b0 to declare bold within the string. And \line creates a new line. You can also do underline, etc. I found it easier to build the String like this than applying properties.

Upvotes: 21

Bogdan
Bogdan

Reputation: 382

In Visual Studio you can use this short code:

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

It will be:

This is in bold

Upvotes: 8

Sujay
Sujay

Reputation: 426

 ObjRichTextBox.SelectionFont = new Font(ObjRichTextBox.Font, FontStyle.Bold);

 ObjRichTextBox.AppendText("BOLD TEXT APPEARS HERE");

 ObjRichTextBox.SelectionFont = new Font(ObjRichTextBox.Font, FontStyle.Regular);

 ObjRichTextBox.AppendText("REGULAR TEXT APPEARS HERE");

Hope this helps :)

Upvotes: 29

LarsTech
LarsTech

Reputation: 81610

This line is a problem:

textBox.Text += roomChatMessage.from + ": " + roomChatMessage.text + "\r\n";

You are replacing the formatting and the text with this new version of a string, and is probably picking up the bold font from the last update.

Try using AppendText instead:

textBox.AppendText(roomChatMessage.from + ": " + roomChatMessage.text + "\r\n");

Upvotes: 13

Arclight
Arclight

Reputation: 483

I feel it may be easier to use the RichTextBox.Rtf property when performing this kind of action, as mentioned here:

MSDN: Code: Formatting Characters in Bold in a RichTextBox Control (Visual C#)

Since as the contents of your text box grows, handling selection entities may end up becoming cumbersome.

Upvotes: 2

Related Questions