Question

Being new to c#, I don’t understand how variables are passed between objects. My array variable “filePaths” is coming back null when I exectute this program. It is a basic windows form. I’m working on making a program that will show the words and play the sound.

The specific error is “NullReferenceException was unhandled.

Here is my particular code.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Media;

namespace Kindersect
{
public partial class form1 : Form
{
    string[] filePaths;
    string directpath = "C:\\Users\\Optimus Prime\\Documents\\vocabaudio\\";
    int counter = 0;
    int c = 0;
    public form1()
    {
        InitializeComponent();
    }

    public void button1_Click(object sender, EventArgs e)
    {
        timer1.Enabled = true;
        string[] filePaths = Directory.GetFiles(directpath, "*.wav");
        foreach(string k in filePaths)
        {
            c++;
        }
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        if (counter < c)
        {
            label1.Text = filePaths[counter];
            SoundPlayer simpleSound = new SoundPlayer(filePaths[counter]);
            simpleSound.Play();
            counter++;
        }

    }
}

}

Thanks in advance.

Answer 1

You are declaring two different variables… in different scopes

remove string[] from the second declaration of filepath if you want access to the global declared filepath