How to add, read, clear the text content in richtextbox control in wpf

How to get, set, clear the text in richtextbox control in wpf

Introduction:

In this article you will know 

• how to assign the text to richtextbox in wpf,
•  how to read and clear the text from richtextbox, 
• how to enable the spell check for richtextbox in wpf, 
• what is the replacement text property for richtextbox,
•  how to set the margins for richtextbox paragraphs. 

Download Source Code and Video explaining How to add, read, clear the text in RichTextBox

Description:

In the previous articles i explained basic WPF concepts like What is wpf and it's features, Wiindows Forms vs WPF Future, what is XAML and it's compilation process,WPF Architecture etc.

What is the replacement Text property for RichTextBox in WPF:

          Unlike other controls in wpf, richtextbox doesn't have content as property for setting content. Richtextbox has Document property to set or get the content or text. Here this Document is FlowDocument type. Here this FlowDocument may contain multiple paragraphs.

How to add text to richtextbox control:

    As the Document Property of the RichTextBox is the FlowDocument type so we have create an object of type FlowDocument, and add paragraphs to Blocks property of FlowDocument and Finally assign this FlowDocument to Document Property of RichTextBox Control.

Here is the Code showing how to add text to richtextbox control in WPF using C#.Net

// Create a Flow Document FlowDocument ObjFdoc = new FlowDocument(); //Add paragraphs to flowdocument Blocks property Paragraph ObjPara1 = new Paragraph(); ObjPara1.Inlines.Add(new Run(" First Paragraph ")); Paragraph ObjPara2 = new Paragraph(); ObjPara2.Inlines.Add(new Run("Second Paragraph")); ObjFdoc.Blocks.Add(ObjPara1); ObjFdoc.Blocks.Add(ObjPara2); // Finally Assign the FlowDocuemnt object to Document Property fo RichTextBox Control. richTextBox1.Document=ObjFdoc;

 Vb.Net Code for addding text to richtextbox

' Create a Flow Document Dim ObjFdoc As New FlowDocument() 'Add paragraphs to flowdocument Blocks property Dim ObjPara1 As New Paragraph() ObjPara1.Inlines.Add(New Run(" First Paragraph ")) Dim ObjPara2 As New Paragraph() ObjPara2.Inlines.Add(New Run("Second Paragraph")) ObjFdoc.Blocks.Add(ObjPara1) ObjFdoc.Blocks.Add(ObjPara2) ' Finally Assign the FlowDocuemnt object to Document Property fo RichTextBox Control. richTextBox1.Document = ObjFdoc

  How to read Text from RichTextBox Control:

       To read text from RichTextBox FlowDocument type we have to use TextRange( ).

Code to Read text RichTextBox using C#.Net

string richText = new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text;

Vb.Net Code

Dim richText As String = New TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text

How to Clear Text in RichTextBox:

          While Adding text to richtextbox, we added paragraphs to Blocks property of FlowDocument type, so for clearing text we have to clear the Blocks of Document in the following two ways.

C#.Net  Code:

richTextBox1.Document.Blocks.Clear(); // OR richTextBox1.SelectAll(); richTextBox1.Selection.Text = "";

Vb.Net Code:

richTextBox1.Document.Blocks.Clear() ' OR richTextBox1.SelectAll() richTextBox1.Selection.Text = ""

Setting Margin for RichTextBox paragraphs:

       While adding text using paragraphs we may get more space between para's in richtextbox so to set the margin between paragraphs use below code in resources section of XAML code.

<richtextbox> <RichTextBox.Resources> <style TargetType="{x:Type Paragraph}"> <setter Value="0" Property="Margin"/> </Style> </RichTextBox.Resources> </RichTextBox>

Enabling Spell Check:

RichTextBox has spell check feature this can be enabled by setting 

richTextBox1.SpellCheck.IsEnabled = true;


You can find the video explained with example on how to add, read,  clear the content in wpf richtextbox control

Conclusion:

I hope you are clear about reading, adding ,clearing the text from richtextbox control. I hope you will see the WPF Tutorials section for More Tutorials and How to's .

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