use color for richtextbox but error in con trỏ mouse when additional character characters

use color for richtextbox but error in con trỏ mouse when additional character characters

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use color for richtextbox but error in con trỏ mouse when additional character characters
Tag : vb.net , By : user143038
Date : January 12 2021, 08:33 AM

hop of those help? You are setting the selection at the end of the text with this ".SelectionStart = Len(Write_code.Text)" You could keep track of the last selection and set it back.
Private Sub Write_code_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Write_code.TextChanged
        Dim strWord As String
        Dim lPos As Long

        strWord = "read"

        lPos = InStr(1, Write_code.Text, strWord, vbTextCompare)

        If lPos > 0 Then
            Dim originalPosition As Long = Write_code.SelectionStart

            With Write_code
                .SelectionStart = lPos - 1
                .SelectionLength = Len(strWord)
                .SelectionColor = Color.Green
                .SelectionStart = Len(Write_code.Text) ' Or maybe put it here
                .SelectionLength = 0
                .SelectionColor = Color.Blue
            End With

            Write_code.SelectionStart = originalPosition
        End If
End Sub

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Appending characters to RichTextBox from a handheld barcode scanner without it creating a new line for each character in

Tag : vb.net , By : CodeOfficer
Date : March 29 2020, 07:55 AM
should help you out Presumably whatever driver is feeding the input is doing it one char at a time. If you don't have control over that code, and you have a static number of chars in your bar code, you could wait for the line to contain that many chars and then add the space, time stamp and linefeed. Something like
Dim lastLine As String
lastLine = RichTextBox1.Lines.Last

If lastLine.Length = 5 Then
    RichTextBox1.AppendText(" " + currentTime + vbLf)
End If

Changing background color of words in richTextBox after typing a special character

Tag : chash , By : Aki Björklund
Date : March 29 2020, 07:55 AM
Hope this helps Here you have a small code red-colouring the background when certain word ("anything") is written in a richtextbox. I hope that this will be enough to help you understand how to interact with a richtextbox at runtime. Bear in mind that it is pretty simplistic: it colours "anything" only if it is first word you introduce; and stops coloring if you write any other character after it.
    int lastStart = 0;
    int lastEnd = 0;
    private void richTextBox1_TextChanged(object sender, EventArgs e)
        richTextBox1.Select(lastStart, lastEnd + 1);

        if (richTextBox1.SelectedText.ToLower() == "anything")
            richTextBox1.SelectionBackColor = Color.Red;
            lastStart = richTextBox1.SelectionStart + richTextBox1.SelectionLength;
            richTextBox1.SelectionBackColor = Color.White;

        lastEnd = richTextBox1.SelectionStart + richTextBox1.SelectionLength;
        richTextBox1.Select(lastEnd, 1);

WinForm RichTextBox text color changes too many characters

Tag : chash , By : Jason Jennings
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Your Select() call leaves the SelectionStart property at the start of the appended text instead of end of the text. You could restore it like you did for SelectionLength, but the simpler way to do it is:
    private static void AppendTextColor(RichTextBox box, Color color, string text) {
        box.SelectionStart = box.Text.Length;   // Optional
        var oldcolor = box.SelectionColor;
        box.SelectionColor = color;
        box.SelectionColor = oldcolor;

C# Richtextbox font and color for special characters

Tag : chash , By : beng
Date : March 29 2020, 07:55 AM
will be helpful for those in need I'd like to know how to change the color of some characters in the richtextbox. , This should work,
using System.Text.RegularExpressions;

List<string> l = new List<string>();

            foreach (var v in l)
                int count = Regex.Matches(rtbxTest.Text, v).Count;//count occurrences of string
                int WordLen = v.Length;
                int startFrom=0;
                for (int i = 0; i < count; i++)    
                    rtbxTest.SelectionStart = rtbxTest.Text.IndexOf(v, startFrom);
                    rtbxTest.SelectionLength = WordLen;
                    rtbxTest.SelectionColor = Color.Red;
                    startFrom = rtbxTest.Text.IndexOf(v, startFrom) + WordLen;


Disable the interaction of the mouse with a RichTextBox (all the mouse events to have no influence on the RichTextBox)

Tag : chash , By : dexteryy
Date : March 29 2020, 07:55 AM
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