CODEWITHSUNDEEP
c#winforms
Lee Loftiss
Lee Loftiss

Reputation: 3205

How to add bold text to rich text box

I'm working with Visual Studio Express 2012 with C#.

I am using code to add text to a RichTextBox. Each time there are 2 lines added. The first line needs to be bold and the second line normal.

Here is the only thing I could think to try, even though I was sure it would not work:

this.notes_pnl.Font = new Font(this.notes_pnl.Font, FontStyle.Bold);
this.notes_pnl.Text += tn.date.ToString("MM/dd/yy H:mm:ss")  + Environment.NewLine;
this.notes_pnl.Font = new Font(this.notes_pnl.Font, FontStyle.Regular);
this.notes_pnl.Text += tn.text + Environment.NewLine + Environment.NewLine;

How can I add bolded lines to a rich text box?

Thanks for the answers submitted so far. I think I need to clarify a little. I am not adding these 2 lines 1 time. I will be adding the lines several times.

Upvotes: 5

Views: 37869

Answers (2)

JaredPar
JaredPar

Reputation: 755557

In order to make the text bold you just need to surround the text with \b and use the Rtf member.

this.notes_pln.Rtf = @"{\rtf1\ansi this word is \b bold \b0 }";

OP mentioned that they will be adding lines over time. If that is the case then this could be abstracted away into a class 

class RtfBuilder { 
  StringBuilder _builder = new StringBuilder();

  public void AppendBold(string text) { 
    _builder.Append(@"\b ");
    _builder.Append(text);
    _builder.Append(@"\b0 ");
  }

  public void Append(string text) { 
    _builder.Append(text);
  }

  public void AppendLine(string text) { 
    _builder.Append(text);
    _builder.Append(@"\line");
  }

  public string ToRtf() { 
    return @"{\rtf1\ansi " + _builder.ToString() + @" }";
  }
}

Upvotes: 9

Aaron Palmer
Aaron Palmer

Reputation: 9012

You can use the Rtf property of your RichTextBox. First generate an rtf string:

var rtf = string.Format(@"{{\rtf1\ansi \b {0}\b0 \line {1}\line\line }}",
                          tn.date.ToString("MM/dd/yy H:mm:ss"), 
                          tn.text);

And append the string to the existing text in your RichTextBox:

this.notes_pln.SelectionStart = this.notes_pln.TextLength;
this.notes_pln.SelectedRtf = rtf;

Upvotes: 4

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