Develop Reference

Change the writing fontstyle without changing the previously written text

This is my code for changing the font style to normal. But my problem is that it changes all of the text in the RichTextBox. What I want is that it will change the selected text and change the style of the text I will write.
private void italicToggle_Unchecked(object sender, RoutedEventArgs e)
{
text.Selection.ApplyPropertyValue(FontStyleProperty, FontStyles.Normal);
text.FontStyle = FontStyles.Italic;
}

A textbox contains only "unformatted text." That is, you can set the font or font style, etc for the whole textbox but not for a portion (selection). To be able to change a portion of text you must use a RichTextBox (RichTextBox Class). And see this for an overview (RichTextBox Overview).

How to change the caret formatting

My problem is that when I paste text into a rich text box I would like to get rid of all the formatting. Now this basically works:
private void RichTextBox1_Pasting(object sender, DataObjectPastingEventArgs e)
{
if (hasImage(Clipboard.GetDataObject()))
{
e.CancelCommand();
}
RichTextBox rtb = sender as RichTextBox;
if (Clipboard.ContainsText(TextDataFormat.Rtf) || Clipboard.ContainsText())
{
// get rid of formatting
string append = Clipboard.GetText(TextDataFormat.UnicodeText);
Clipboard.SetText(append, TextDataFormat.UnicodeText);
}
}
The problem is: If I previously had formatted text in my rich text box (e.g., bold text) and removed this text, the caret would still be bold (or italic if italic was previously selected - this is easy to spot since the caret would be oblique!). In this case, the text would also be inserted with this formatting. How can I get rid of that?

If you want to clear the entire document of previous formatting, you could do something like:
TextRange wholeDocument = new TextRange(Document.ContentStart, Document.ContentEnd);
wholeDocument.ClearAllProperties();
If you want to keep the previous formatting (i.e. you are appending), it looks like this may be useful: https://msdn.microsoft.com/en-us/library/ms597038(v=vs.110).aspx

Although this only solves part of the problem, it is satisfactory for our purposes:
rtb.Selection.ClearAllProperties();
With this line, the formatting of the selected text is removed. So if you mark some text that is formatted and press CTRL+V, the text from the clipboard is inserted without formattings.
What remains unsolved is how to clear the formattings of the caret if you just remove a couple of characters using backspace.

Voice Enabled RichTextBox

I am trying to create a WPF application that has a richtextbox which accepts dictations from the user as its input.
I want to use this code for the SpeechRecognized event for an an object of the SpeechRecognitionEngine class.
private void speechRecognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
e.Result.Text = rtb.Text; //rtb is an object of the RichTextBox class
}
The problem is that there is no Text property for the RichTextBox class. Is there any way of fixing this? Thanks in advance

Try this:
private void speechRecognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
rtb.AppendText(e.Result.Text);
}

This is a well documented problem and there are many different solutions for it. You can find a large number of possible solutions in the answers to the RichTextBox (WPF) does not have string property “Text” question here on Stack Overflow.
However, my preferred method would be to declare a Text Attached Property for the RichTextBox class. Please see the Attached Properties Overview page on MSDN to find out more about Attached Properties. You can find out what code to use in your Text Attached Property for the RichTextBox class in the RichTextBox Text property where are you hiding? tutorial on C# Disciples website.

RichTextBox contents can be set via Document property. You can find more details on MSDN
Here is an example from the link provided above. It creates a new document and a paragraph for it, then assigns the document to RichTextBox:
// Create a simple FlowDocument to serve as content.
FlowDocument flowDoc = new FlowDocument(new Paragraph(new Run("Simple FlowDocument")));
// Create an empty, default RichTextBox.
RichTextBox rtb = new RichTextBox();
// This call sets the contents of the RichTextBox to the specified FlowDocument.
rtb.Document = flowDoc;
// This call gets a FlowDocument representing the contents of the RichTextBox.
FlowDocument rtbContents = rtb.Document;

Remove table definition from RichTextBox in WPF?

I have a RichTextBox control in my view. I'm using code-behind (UI logic only) to format the RTF within my RichTextBox which is working from a 'Format' button click event which instantiates a TextRange:
private void _btnFormat_Click(object sender, RoutedEventArgs e)
{
TextRange rangeOfText = new TextRange(richTextBoxArticleBody.Document.ContentStart, richTextBoxArticleBody.Document.ContentEnd);
rangeOfText.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Black);
rangeOfText.ApplyPropertyValue(TextElement.FontSizeProperty, "12");
rangeOfText.ApplyPropertyValue(TextElement.FontFamilyProperty, "Arial");
rangeOfText.ApplyPropertyValue(TextElement.FontStyleProperty, "Normal");
rangeOfText.ApplyPropertyValue(Inline.TextDecorationsProperty, null);
}
I want to also remove any tables within the RTF. Can I use the same approach maybe from the Table class to remove tables from my RichTextBox? Thanks

You'll have to climb down the Blocks and get the descendants
of the FlowDocument and get all the Tables and then remove them from the its Parent.

Ok, if anyone is trying to achieve this I don't think it's possible. Maybe you can iterate over a simple table in an Rtf string and remove the tags but if you can't determine user input the Rtf is by far too complex. Therefore here's my solution (of sorts...)
private void _btnFormat_Click(object sender, RoutedEventArgs e)
{
TextRange rangeOfText = new TextRange(richTextBoxArticleBody.Document.ContentStart, richTextBoxArticleBody.Document.ContentEnd);
rangeOfText.ApplyPropertyValue(Table.BorderThicknessProperty, "3");
rangeOfText.ApplyPropertyValue(Table.BorderBrushProperty, Brushes.Red);
}
In the 'Format' button click event I've set table borders to Red. On my save back to the database method I've used this simple if statement:
private void SaveToDbCommandAction()
{
if(PastedText.Contains("trowd"))
{
Xceed.Wpf.Toolkit.MessageBox.Show("Cannot save Article. Please remove pasted tables");
}
else
{
SaveToDb(RTBText);
}
}
Therefore when the user pastes in a table they are warned via the red cell borders. This is particularly useful if they paste a table with invisible borders and can't actually see the table. The If statement then determines whether the Rtf string contains a 'trowd' tag therefore preventing the save.

How to paste text to RichTextBox as a plain text

If I copy some text with different format and paste it to my richtextbox it is not plain I mean its format will be copied as well.
Is there anyway I can copy-paste as a plain text?
By the way my program is on WinForm
thanks for any answer

you must use WinForm RichTextBox (not in UI, just in code), even if you are on WPF, in order to convert RTF to plain text. Use this method in your Copy event.
C# code :
private String ConvertRtfToText()
{
System.Windows.Forms.RichTextBox rtfBox = new System.Windows.Forms.RichTextBox();
rtfBox.Rtf = this.rtfData;
return rtfBox.Text;
}
VB.Net Code :
Private Function ConvertRtfToText() As String
Dim rtfBox As RichTextBox = New RichTextBox()
rtfBox.Rtf = Me.rtfData
Return rtfBox.Text
End Function
source : http://msdn.microsoft.com/en-US/en-en/library/vstudio/cc488002.aspx

I recently had the same issue. I did want to retain some of the formatting, i.e. paragraphs and line feeds, but I required all the addition text format to be removed.
I'm working in WPF but the RichTextBox interface is the same. I have created a button that will allow users to select some text and remove the formatting. It is very simple, you just need to use the ClearAllProperties() method on the TextSelection object.
C# Code (WPF):
private void ClearFormat_Click(object sender, RoutedEventArgs e)
{
rtbText.Selection.ClearAllProperties();
}

This is a super easy solution but perhaps not super elegant...
1) Add a plain textbox to your form and make it hidden
2) Create a button to remove the formatting (or you can do this
automatically when the text is pasted)
3) In the OnClick (or OnPaste) code just copy the text from the rich
textbox control to the plain textbox control then copy the text
from the plain textbox back to the rich textbox control (see example
below)
private void btnRemoveFormatting_Click(object sender, EventArgs e)
{
txtPlainText.Text = txtRTF.Text;
txtRTF.Text = ""; // Required - this makes sure all formatting is gone
txtRTF.Text = txtPlainText.Text;
}