CODEWITHSUNDEEP
c#
Niloo
Niloo

Reputation: 1215

How to set FontStyle for some text in a rich text box?

I have a RichTextBox. I want change fontStyle of selected text without change FontFamily.

I use this code

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

It is change fontstyle, but my problem is :

When i select a text with change fontfamily, i get error

Object reference not set to an instance of an object.

beacuse 

RTBMain.SelectionFont=null

For example :

My text is "I have a student "

FontFamily for "a" is "Tahoma"

FontFamily for "student" is "Tango"

Then i select "a student" : FontFamily for this is null.

But when i select "a" or "student" : font family not is null.

Upvotes: 4

Views: 8731

Answers (2)

SysDragon
SysDragon

Reputation: 9888

For example:

richTextBox1.Find("Text", RichTextBoxFinds.MatchCase);

richTextBox1.SelectionFont = new Font("Verdana", 12, FontStyle.Bold);
richTextBox1.SelectionColor = Color.Red;

You need to select the text you want to change format, first.

And SelectionFont cannot be two fonts at the same time.

Upvotes: 1

andy
andy

Reputation: 6079

if(RTBMain.SelectionFont != null)
{
 RTBMain.SelectionFont = new Font(RTBMain.SelectionFont, FontStyle.Bold);
}

or 

if (RTBMain.SelectionLength > 0)
{
 RTBMain.SelectionFont = new Font(RTBMain.SelectionFont, FontStyle.Bold);
}

REFERENCE

private void ToggleBold()
{
 if (richTextBox1.SelectionFont != null)
 {
  System.Drawing.Font currentFont = richTextBox1.SelectionFont;
  System.Drawing.FontStyle newFontStyle;

  if (richTextBox1.SelectionFont.Bold == true)
  {
     newFontStyle = FontStyle.Regular;
  }
  else
  {
     newFontStyle = FontStyle.Bold;
  }

  richTextBox1.SelectionFont = new Font(
     currentFont.FontFamily, 
     currentFont.Size, 
     newFontStyle
  );
 }

}

Upvotes: 4

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