How to access index in IEnumerable object in C#?

I have an IEnumerable object. I would like to access based on index for instance:

for(i=0; i<=开发者_StackOverflowModel.Products; i++)
{
      ???
}

Is this possible?

First of all, are you sure it's really IEnumerator and not IEnumerable? I strongly suspect it's actually the latter.

Furthermore, the question is not entirely clear. Do you have an index, and you want to get an object at that index? If so, and if indeed you have an IEnumerable (not IEnumerator), you can do this:

using System.Linq;
...
var product = Model.Products.ElementAt(i);

If you want to enumerate the entire collection, but also want to have an index for each element, then V.A.'s or Nestor's answers are what you want.

There is no index in IEnumerator. Use

foreach(var item in Model.Products)
{
   ...item...
}

you can make your own index if you want:

int i=0;
foreach(var item in Model.Products)
{
    ... item...
    i++;
}

var myProducts = Models.Products.ToList();
for(i=0; i< myProducts.Count ; i++)
{
      //myProducts[i];
}

foreach(var indexedProduct in Model.Products.Select((p, i)=> new {Product = p, Index = i})
{
   ...
   ...indexedProduct.Product...
   ...indexProduct.Index ...//this is what you need.
   ...
}

The best way to retrieve an item by index is to reference your enumerable collection with an array using Linq in this way:

using System.Linq;
...
class Model {
    IEnumerable<Product> Products;
}
...
// Somewhere else in your solution,
// assume model is an instance of the Model class
// and that Products references a concrete generic collection
// of Product such as, for example, a List<Product>.
...
var item = model.Products.ToArray()[index];