How to Change Font Color on RichTextBox after USING SPLIT

Question

4.00/5 (1 vote)

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VS2010

Hello Master / Programmer.

I'm trying to use Split(), after using it, i wanna check if the input on RTB == my point then change font color on RTB. Like this example.

INPUT on RTB : Chelsea is my favorite football club. I like playing football

My point : football.

Then I split the input, then i check the result of split in arr each index.

Finally, found ex : arr[4] and [9] = football

Then, how to change font color on RTB screen like
"Chelsea is my favorite football. I like playing football club."?

This my code example :

C#

ArrayList arrInput = new ArrayList();
//if the input Chelsea is my favorite football club. I like playing football
string allInput = rtbInput.Text;

string[] splitString = allInput.Split(new char[] { ' ', '\t', ',', '.'});

foreach (string s in splitString)
{
    if (s.Trim() != "")
    {
         int selectionStart = s.ToLower().IndexOf("football");

         if (selectionStart != -1)
         {
             rtbInput.SelectionStart = selectionStart;
             rtbInput.SelectionLength = ("football").Length;
             rtbInput.SelectionColor = Color.Red;
         }
}
//What Next?? We know that football on arrInput[4].ToString() and [9]
//How to change font color on RTB screen when the input == football

Posted 10-Mar-13 23:54pm

Berry Harahap

Updated 11-Mar-13 3:37am

v4

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Comments

johannesnestler 11-Mar-13 9:02am

I'm just curious - what is a RTB Screen?

Berry Harahap 11-Mar-13 9:36am

Dear @johannesnestler..
Sorry, it means RichTextBox. :) :) :)

AssemblySoft 11-Mar-13 10:07am

Berry, is this a WPF, Windows Forms or Asp.Net application? RTB - i guess you are talking about rich text box, need to know what rich text box you are using.

Berry Harahap 11-Mar-13 10:10am

Dear @Carl Randall
Using C#, Windows Form.
:) :) :)

Sergey Alexandrovich Kryukov 11-Mar-13 10:44am

You need to tag it all. So far, you have some questions and answers about nothing.
—SA

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Jegan Thiyagesan · Accepted Answer · 2013-03-11T12:24:00

Hi,
There are few things wrong here.

There is an unused variable,

C#

ArrayList arrInput = new ArrayList();

I am not sure why you have this variable for.

The string has been split into words and then foreach word a looking for the word "football" and getting the index of that word

C#

int selectionStart = s.ToLower().IndexOf("football");

This will always return selectionSrart as 0; because you not looking for an index in the whole sentance instead just that word.

So in your code above, only the first 8 characters will be in the colour you set, but what you actual text you wanted wouldn't be in colour.

What you need is:

C#

int index = 0;
while (index != -1)
{
    // on the first round the index will be zero, thereafter the index will not be zero
    // therefore the index needs to be incremented by 1 from the last index so it can continue 
    // searching, otherwise the search will stuck to that same index.
    index = str.IndexOf(rtbInput.Text, (index != 0) ? (index + 1) : index );
    if ( index != -1)
    {
        rtbInput.SelectionStart = index;
        rtbInput.SelectionLength = ("football").Length;
        rtbInput.SelectionColor = Color.Red;
    }
}

I hope this helps.

Regards
Jegan