I am trying to find index of an array.Probably doing this is easy but I couldn't do that.I tried to add a function(findIndex),looking at a website but I am getting an error.How can I find the index?

namespace exmple.Filters
{
    class dnm2
    {
        public static byte[] Shape(byte[] data)
        {
            byte[] shape = new byte[data.Length];
            byte count = 0;
           
            for (int i = 0; i < data.Length; i  )
            {
                if (data[i] == 0)
                {
                    shape[i] = (data[i]);

                    int index = shape.findIndex(count);
                    int[] a = {1, 2, 3};
                    int index = a.Indexof((int)3);
                    count  = 1;

                }
            }
            return shape;
        }

public static int findIndex<T>(this T[] array, T item)
    {
        EqualityComparer<T> comparer = EqualityComparer<T>.Default;
        for (int i = 0; i < array.Length; i  )
        {
            if (comparer.Equals(array[i], item)) {
                return i;
            }
        }
 
        return -1;
    }
    }

CodePudding user response：

Array.IndexOf() gives you the index of an object in an array. Just make sure you use the same data types, i.e. byte here.

This is the full code, tested in .NET 4.5.2

using System;

namespace ConsoleApp2
{
    class Program
    {
        static void Main()
        {
            byte[] data = { 5, 4, 3, 2, 1 };
            Console.WriteLine(Array.IndexOf(data, (byte)2));
            Console.ReadLine();
        }
    }
}

CodePudding user response：

Alternate way is to use Array.FindIndex(array, predicate)

var zeroBasedIndex = Array.FindIndex(data, x => x == (byte)2);

CodePudding user response：

Not sure what you are trying to do but I have fixed your code.

namespace Exmple.Filters
{
    public static class DNM
    {
        public static byte[] Shape(byte[] data)
        {
            byte[] shape = new byte[data.Length];
            byte count = 0;

            for (int i = 0; i < data.Length; i  )
            {
                if (data[i] == 0)
                {
                    shape[i] = (data[i]);
                    int index = shape.FindIndex1(count);
                    int[] a = { 1, 2, 3 };
                    int index1 = Array.IndexOf(a, (int)3);
                    count  = 1;

                }
            }
            return shape;
        }

        public static int FindIndex1(this byte[] array, byte item)
        {
            EqualityComparer<byte> comparer = EqualityComparer<byte>.Default;
            for (int i = 0; i < array.Length; i  )
            {
                if (comparer.Equals(array[i], item))
                {
                    return i;
                }
            }

            return -1;
        }
    }
}

there were few issues in your code

1. Naming rule violations
2. byte[] already has an FindIndex so compiler was getting confused which one to use (I just removed the generic things and changed the name)
3. array object doesn't have a IndexOf Method, Array class has a method.