Inability to properly load Rtf to a RichTextBox

Question

I have a custom RichTextBox that derives from the RichTextBox base class. Its purpose is to display formatted text. However, any Rtf loaded is displayed as simple text without any formatting: font, font-size, font-style etc.

I have tried the following code to load the Rtf: (Note: rtbEx is the extended richtextbox control; RTF is a string containing the Rtf)

1. Using a file stream:

    FileStream tempFile = File.Open(@"C:\\RTF.rtf", FileMode.Open); tempFile.Position = 0; rtbEx.LoadFile(tempFile, RichTextBoxStreamType.RichText); tempFile.Close();

2. Loading from the specified path:

    rtbEx.LoadFile(@"C:\\Users\\Wilbur Omae\\Desktop\\RTF.rtf", RichTextBoxStreamType.RichText);

3. Directly setting the Rtf:

    rtbEx.Rtf = RTF;

On checking the Rtf of the rtbEx, it seems to be perfect Rtf, yet it is displayed as plain text.

What could be the issue?

Update 1: The custom RichTextBox is a control within a custom Form which it to be displayed as a TabPage.

Answer 1

you can use Clipboard in this case :

 Clipboard.SetText(RichTextBox1.Rtf, TextDataFormat.Rtf);

and paste it

 RichTextBox1.Text= Clipboard.GetText()

It works for me .. try it

Answer 2

As a workaround, I ensured the Rtf was set only when the form had been shown by trapping the Form.Shown event as shown below:

public class SermonReader : Form
{
    public RichTextBoxEx rtbEx= new RichTextBoxEx();
    private string RTF = "";

    public SermonReader(string rtf)
    {
        RTF = rtf;

        Shown += new EventHandler(ehFormShown);
        FormBorderStyle = FormBorderStyle.None;
        TopLevel = false;

        Controls.Add(rtbEx);

        rtbEx.Dock = DockStyle.Fill;
    }
    private void ehFormShown(object sender, EventArgs e)
    {
        rtbEx.Rtf = RTF;
    }
}

I don't know why the issue is this complicated but I hope this helps.

Any other solution? Feel free to comment or answer.

Answer 3

I had the same problem with a richtextbox within a winformscontrol within a dialog (MFC), the rtb should be filled with rtf, but after setting RichTextBox.Rtf, loading from file or Clipboard it all was unformatted. I could solved it by using Postmessage in OnInitDialog with UpdataData(FALSE) (Sets RichTextBox.Rtf again) in the handler. seems as if creation yet was not complete ..