How to get the index of int array when using linq query

Question

i want to create a Dropdownlist with specific numbers in MVC

So in my model i have a property :

public IEnumerable<SelectListItem> Quantities { get; set; }

In my controller i instantiate my model :

Quantities = from s in numbers
             select new SelectListItem { Text = s.ToString()}

numbers is a int array with 10 numbers in it.

This code works but the problem is i cant get the value(index) of the array from 's'.

Does anyone know how i can get this value?

Darin Dimitrov · Accepted Answer · 2012-02-05 14:21:06Z

3

This is not possible with LINQ expressions. You could use the following:

Quantities = numbers.Select((s, index) => new SelectListItem 
{ 
    Value = index.ToString(), 
    Text = s.ToString()
);

answered Feb 5, 2012 at 14:21

Darin Dimitrov

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3 Comments

nmeuleman Over a year ago

Thanks! That works perfectly indeed. I dont realy understand it though, the arguments for .select(Func<int, TResult>selector) for example... Its nice when having working code but more fun if you understand it aswell :)

Darin Dimitrov Over a year ago

@wartodust, there are 2 arguments that the anonymous method takes: the first is the current element and the second is an integer representing the index.

Larry Over a year ago

Wow. This is a well hidden LINQ feature !

Zebi · Accepted Answer · 2012-02-05 14:21:45Z

0

You can use the method syntax instead of the query syntax:

var quantities = numbers.Select((x,i) => {...});

answered Feb 5, 2012 at 14:21

Zebi

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