CODEWITHSUNDEEP
c#fontsrichtextbox
Kroll DU
Kroll DU

Reputation: 79

C# Richtextbox font and color for special characters

I'd like to know how to change the color of some characters in the richtextbox.

I want to change the color for the four key words:"CONDITION","FIRSTCONDITION","SECONDCONDITION","ACTION"

Here is my text in the Richtextbox

"If (CONDITION) then"
"And (FIRSTCONDITION)&(SECONDCONDITION)"
"While (CONDITION) do(ACTION)"

At last my code

public Form1()
{
    InitializeComponent();


}

private void MyRichTextBox(object sender, EventArgs e)
{
    richTextBox1.Font = new Font("Arial", 12f, FontStyle.Bold);
    string[] words =
    {  "If (CONDITION) then","And (FIRSTCONDITION)&(SECONDCONDITION)",
"While (CONDITION) do(ACTION)"
    };

    for (int i = 0; i < words.Length; i++)
    {
    string word = words[i];
    {
        richTextBox1.AppendText(word);
    }
    }
MyRichTextBox.Settings.Keywords.Add("CONDITION");
MyRichTextBox.Settings.Keywords.Add("FIRSTCONDITION");
MyRichTextBox.Settings.Keywords.Add("SECONDCONDITION");
MyRichTextBox.Settings.Keywords.Add("ACTION");
MyRichTextBox.Settings.KeywordColor = Color.Blue;
}

Thanks for your help.

Upvotes: 0

Views: 530

Answers (1)

Kryptonian
Kryptonian

Reputation: 870

This should work,

using System.Text.RegularExpressions;

List<string> l = new List<string>();
        l.Add("CONDITION");
        l.Add("FIRSTCONDITION");
        l.Add("SECONDCONDITION");
        l.Add("ACTION");

            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;

                }
            }

This finds all the occurrences of a particular string and changes its color.

Upvotes: 1

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