How to detect a word from a string in a listbox?

Question

Hi all,

How do i detect a certain word from a string in my listbox?

For example the strings maybe:

" Open picture gallery."

"Please open gallery"

and i want to detect the word 'open'.

My string will be different each time so how do i detect only the word "open"?

Thanks in advance

Answer 1

As you said, use Contains...

i.e.

if(inString.ToLower().Contains("open"))
    DoTheStuff();

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Answer 2

Hi ioioleo,

you can use indexof method of string.

From MSDN :

indexof Reports the zero-based index of the first occurrence of a specified Unicode character or string within this instance. The method returns -1 if the character or string is not found in this instance.

once you get your index,you can use any other methods to populate your string.

 string myText = "I love the world of programming";
            int positionOfword = myText.IndexOf("world");

EDIT : personally I prefer Indexod method more, because string.contains method return only true or false, but If you found the string(i.e. string.contains method returns true) in most of case you have to found index for string population.

may be it helps you.

If anything is unclear feel free to ask me... :)

Thanks,

Nans11

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ENjoy ThE WorLD Of COdE

Answer 3

Thanks Nans11 for your quick response,

maybe i should rephrase,

How should i detect the word if the word is in an item of a listbox?

Any clue?

Thank you in advance :)

Cheers!

Answer 4

JoJo Leo :

You need to loop through listbox items .. May be this is of a start

  string[] arr = { "Open picture gallery.", "Please open gallery" };
            listBox1.Items.AddRange(arr);
            
            string yoursearchstring = "Open";

            for (int i = 0; i < listBox1.Items.Count; ++i)
            {
                if (listBox1.Items[i].ToString().Contains(yoursearchstring))
                {
                    //Found your string do your stuff
                }
            }

Answer 5

Answer 6

Thanks Venkat786,

It is almost there! However the message will open up thrice if there are 3 items in my listbox because it's searching through all items.

But i  just want it to detect the latest item that was being sent and show up the messagebox.

Here's the code.

  string nom;

            nom = txtBox.Text;
            lstItems.Items.Add(nom);
            string yoursearchstring = "open";

            for (int i = 0; i < lstItems.Items.Count; ++i)
            {
                if (lstItems.Items[i].ToString().Contains(yoursearchstring))
                {
                    MessageBox.Show("Opening in progress...");
                }
                else
                {
                    MessageBox.Show("'OPEN' not detected!");
                }
            }

Answer 7

You don't need iterate, just use sample from my first post - only replace inString by nom...

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Answer 8

Yup got it as well. Thanks!

I thought what was thinking what is an Instring.

Answer 9

            string nom;

            nom = txtBox.Text;
            lstItems.Items.Add(nom);
            string yoursearchstring = "open";

            // method 1 

            int i = lstItems.Items.Count;
            int p = i - 1;

            if (lstItems.Items[p].ToString().Contains(yoursearchstring))
            {
                MessageBox.Show("Opening in progress...");
            }
            else
            {
                MessageBox.Show("'OPEN' not detected!");
            }

            // method 2

            if (nom.Contains("open"))
            {
                MessageBox.Show("Opening in progress...");
            }
            else
            {
               MessageBox.Show("'OPEN' not detected!");
            }

Thank you guys :)