WPF RichTextBox features in TextBlock

In WPF, the TextBlock is used to display simple text. We can apply several formatting to the text like Bold, Italics or Underline to name a few.

But it is a little known fact that it is possible to display several differently formatted text in a SINGLE TextBlock!!!
for e.g. you can make a TextBlock display the following text

This is a simple multiformat text!


This can be achieved by using multiple Run.

Normally when you assign a text to the TextBlock, it creates a single Run which encapsulates the text assigned.

In order to add multiformatted text to a TextBlock, you have to create several Runs and add them to the TextBlock's Inlines property.

Here is an example

Run run1 = new Run("This is ");

Run run2 = new Run("bold");
run2.FontWeight = FontWeights.Bold;

Run run3 = new Run(" and ");

Run run4 = new Run("italic");
run4.FontStyle = FontStyles.Italic;

Run run5 = new Run("text.");

myTextBlock.Inlines.Add(run1);
myTextBlock.Inlines.Add(run2);
myTextBlock.Inlines.Add(run3);
myTextBlock.Inlines.Add(run4);
myTextBlock.Inlines.Add(run5);

This will set the myTextBlock as

This is bold and italic text.

More information on TextBlock can be found here[^].