c# RTB - paste plain text without colours/fonts?

Question

I am using Rich Text object in my C# application. The only issue I am having is that when user pastes formated text from another app, it remains formated which I cannot have. Is there any way how to paste only string and ignore formatting? Thanks!

Answer 1

You can also use

private void richTextBox1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Control && e.KeyCode == Keys.V)
    {
        richTextBox1.SelectedText = (string)Clipboard.GetData("Text");
        e.Handled = true;
    }
}

Answer 2

There is a very simple way to do this that is working well for me:

private bool updatingText;

public MyForm() {
    InitializeComponent();
    inputTextBox.TextChanged += inputTextBox_TextChanged;
}
private void inputTextBox_TextChanged(object sender, EventArgs e)
{
    if (updatingText)
    {
        return;
    }
    updatingText = true;
    try
    {
        var i = inputTextBox.SelectionStart;
        var text = inputTextBox.Text;
        inputTextBox.Rtf = "";
        inputTextBox.Text = text;
        inputTextBox.SelectionStart = i;
    }
    catch (Exception){}
    updatingText = false;
}

Since the Text property is inherently without formatting resetting the RTF text then setting the text property to the raw input removes any of the special items that may have been pasted in.

Answer 3

Simple, but everything in the clipboard is in plain text when application is open.

private void timer2_Tick(object sender, EventArgs e)
        {
            string paste = Clipboard.GetText();
            Clipboard.SetText(paste);
        }

Answer 4

My solution

private void OnCommandExecuting(object sender, Telerik.Windows.Documents.RichTextBoxCommands.CommandExecutingEventArgs e)
{
    if (e.Command is PasteCommand)
    {
        //override paste when clipboard comes from out of RichTextBox (plain text)
        var documentFromClipboard = ClipboardEx.GetDocumentFromClipboard("RadDocumentGUID");
        if (documentFromClipboard == null)
        {
            (sender as RichTextBox).Insert(Clipboard.GetText());
            e.Cancel = true;
        }
    }
}

Answer 5

I achieved this by udpating the font and colour for the whole RTB when its contents are changed. This works fine for me as the entry box does not need to deal with huge amounts of text.

public FormMain()
{
    InitializeComponent();
    txtRtb.TextChanged += txtRtb_TextChanged;
}

void txtRtb_TextChanged(object sender, EventArgs e)
{
    RichTextBox rtb = (RichTextBox)sender;
    rtb.SelectAll();
    rtb.SelectionFont = rtb.Font;
    rtb.SelectionColor = System.Drawing.SystemColors.WindowText;
    rtb.Select(rtb.TextLength,0);
}

Answer 6

The answer from pasztorpisti worked like a charm for me. Since I'm using vb.net I thought I'd post my translated code for others:

Imports System.Runtime.InteropServices
Imports System.ComponentModel

Public Class MyRichTextBox
    Inherits Windows.Forms.RichTextBox

    Public Const WM_USER As Integer = &H400
    Public Const EM_SETTEXTMODE As Integer = WM_USER + 89
    Public Const EM_GETTEXTMODE As Integer = WM_USER + 90

    'EM_SETTEXTMODE/EM_GETTEXTMODE flags
    Public Const TM_PLAINTEXT As Integer = 1
    Public Const TM_RICHTEXT As Integer = 2          ' Default behavior 
    Public Const TM_SINGLELEVELUNDO As Integer = 4
    Public Const TM_MULTILEVELUNDO As Integer = 8    ' Default behavior 
    Public Const TM_SINGLECODEPAGE As Integer = 16
    Public Const TM_MULTICODEPAGE As Integer = 32    ' Default behavior

    <DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
    Private Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr
    End Function

    Private _plainTextMode As Boolean = False
    <DefaultValue(False),
      Browsable(True)>
    Public Property PlainTextMode As Boolean
        Get
            Return _plainTextMode
        End Get
        Set(value As Boolean)
            _plainTextMode = value

            If (Me.IsHandleCreated) Then
                Dim mode As IntPtr = If(value, TM_PLAINTEXT, TM_RICHTEXT)
                SendMessage(Handle, EM_SETTEXTMODE, mode, IntPtr.Zero)
            End If
        End Set
    End Property

    Protected Overrides Sub OnHandleCreated(e As EventArgs)
        'For some reason it worked for me only if I manipulated the created
        'handle before calling the base method.
        Me.PlainTextMode = _plainTextMode

        MyBase.OnHandleCreated(e)
    End Sub
End Class