RichTextBox Color Text problems

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Hi,

first the information you may require, i'm using .NET 3.5.

My Problem is, that my RichTextBox does not want to color textparts. I already asked google and tried 10 different way's. I also searched codeprojekt. Here is the Codepart:

C#

this.BeginInvoke(new MethodInvoker(delegate()
            {
                output.SelectionStart = output.Text.Length;
                //output.SelectionFont = font;
                output.SelectionColor = Color.Red;
                output.AppendText(text);
                Application.DoEvents();
            }));

But the Text is still not Red -.-

Posted 21-Oct-10 9:23am

diialer

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3 solutions

Solution 2

What you need to do is note the position of the start of the selection, append the text, select the appended text and then change the color of the selection.

Posted 21-Oct-10 10:37am

Chris Trelawny-Ross

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William Winner · Accepted Answer · 2010-10-21T09:51:00

Solution 1

you need to set the SelectionLength as well.

For that matter, I don't think I understand what you're trying to do.

Are you trying to append text to the output and then highlight it? If so, you've got your code all mixed up. First, you append the text. Then, you set the SelectionStart to where the text begins. Then, you set the SelectionLength to the length of the added text. Then you change the SelectionColor.

Posted 21-Oct-10 9:51am

William Winner

Updated 21-Oct-10 9:53am

v2

Comments

diialer 21-Oct-10 17:39pm

You mean like this?

this.BeginInvoke(new MethodInvoker(delegate()
{
int selectionStart = output.Text.Length;
output.AppendText(text);
output.SelectionStart = selectionStart;
output.SelectionLength = text.Length; // Even without this line it does not work...
output.SelectionColor = Color.Red;
}));

First i get the startposition, cuz the RichTextBox is not empty. Then i append the text and start the selection at for example 20 with the length 10 and color it in red.

Still does not work... -.-

William Winner · Accepted Answer · 2010-10-21T11:18:00

Ok, so, first, don't post an answer that isn't actually an answer.

As an FYI, I created a form with just a RichTextBox, a Button, and a BackgroundWorker. Here's the code for it:

C#

private void button1_Click_1(object sender, EventArgs e)
{
    backgroundWorker1.RunWorkerAsync(richTextBox1);
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    RichTextBox caller = (RichTextBox)e.Argument;
    string text = "Test";
    if (caller.InvokeRequired)
    {
        caller.BeginInvoke(new MethodInvoker(delegate()
        {
            int selectionStart = caller.Text.Length;
            caller.AppendText(text);
            caller.SelectionStart = selectionStart;
            caller.SelectionLength = text.Length;
            caller.SelectionColor = Color.Red;
        }));
    }
}

It adds the string "Test" to the RichTextBox and makes the color red. So if it's not working for you, you're doing something wrong.