How to check if ListBox contains same text as another ListBox-CodePudding

I have 2 Listbox and I want to check the first Listbox text so that I can add them to the second Listbox. Like, let's say that I have a car registration plate on the first Listbox ( 02-TH-93 ) and now I want to add on my second Listbox that same plate ( 02-TH-93 ) BUT if that plate doesn't exist on the first ListBox then it should just show a message error.

For example:

ListBox1: 02-TH-93 | 06-JK-58 | 07-HJ-95 | 02-FG-56

ListBox2: 02-TH-93 | 06-JK-58 | 07-HJ-95 | 45-ER-01 (Show message error now because there's no match of this registration plate on listbox1)

I tried this but it doesn't really make a lot of sense I guess:

            parking.Entrance = textBoxEntrance.Text;
            parking.Exit = textBoxExit.Text;
            if(parking.Entrance == parking.Exit) 
            { 
                  listBoxExit.Items.Add("Plate: "   parking.Exit   " Exited ");
            }

Thanks

CodePudding user response：

I assume that your Listbox.ItemsSource is a list of strings so you could just loop through one of those lists and look for a match like this:

private bool IsInFirst(string plateToAdd, List<string> plates)
    {
        foreach(string plate in plates)
        {
            if (plate.Equals(plateToAdd))
            {
                return true;
            }
        }
        return false;
    }

If it returns true the list contains the plate to add and if it returns false it doesn't. This tutorial helped me.

CodePudding user response：

I have created a variate as I understand it, so it asks if the "plate" is present in lb1. If yes then add it if not ignore it and make a message box

private bool ExistsCheck(string newPlate, List<string> allPlates)
    {
        bool result = false;
        foreach (var plate in allPlates)
            if (plate.Equals(newPlate))
                result = true;
        return result;
    }

private void AddAndCheck_Click(object sender, EventArgs e)
    {
        List<string> allPlates = new List<string>();

        for (int i = 0; i < lb1.Items.Count; i  )
            allPlates.Add(lb1.Items[i].ToString());

        if (ExistsCheck(tb_plate.Text, allPlates))
        {
            // If its return False
            lb2.Items.Add(tb_plate.Text);
        }
        else
        {
            // If its return True
            MessageBox.Show("It is not present in listbox 1");
        }
    }