Finding a specfic int in a List

Question

I have a list which is created from a Class:

class Vara
{
    public int streckKod { get; set; }
    public string artNamn { get; set; }
}

And the list looks like this:

List<Vara> minaVaror = new List<Vara>();

And I add to the list with this line:

minaVaror.Add(new Vara() {streckKod = inputBox1, artNamn = textBox2.Text });

But what I'm stuck at is how I can find a specific int within the list. Let's say I'm searching for the item in my list holding the number 293 in the variable streckKod.

I've tried using .IndexOf function but I haven't gotten it to work properly.

Also would it be possible to get the item number that the specific number is located in?

Answer 1

If you want to find all items whose streckKod value is 293 use Where

var items = minaVaror.Where(i => i.streckKod == 293);

If interested in only first item use FirstOrDefault -

var item = minaVaror.FirstOrDefault(i => i.streckKod == 293);

FirstOrDefault will return null in case no item exist in collection with value 293.

Make sure you add namespace System.Linq in your class to use these LINQ extension methods.

Answer 2

Use Linq

minaVarror.Find(item=>item.strekKod == 293);

Answer 3

Adding to Rohit Vats answer...

When you have found your item, with either Where or FirstOrDefault you can get the index by doing:

var item = minaVaror.FirstOrDefault(i => i.streckKod == 293);

// Get index of Vara (item) with streckKod = 293
int index = minaVaror.IndexOf(item);

As IndexOf returns the position of an exact item (Vara) within the list minaVaror