How can I access a element of a IReadOnlyCollection through it index?

Question

I am working with selenium and I am using the function FindElements so I am getting a element that implements IReadOnlyCollection interface. I want to iterate through the list but it seems that IReadOnlyCollection doesnt have any method like Get(int index) or a implementation of the operation [].

I want to avoid transforming the result to a List or to an array since I just want to access the elements to read them.

Currently I don't want to use a foreach since I need to manage an index so I can add those elements to an another array.

This is what I want to do:

public void fillMatrix(){     IReadOnlyCollection<IWebElement> rows = Driver.FindElements(By.XPath("./*/tr"));                     IReadOnlyCollection<IWebElement> elements;         matrix = new IControl[rows.Count()][];         for(int i = 0; i < matrix.Count(); ++i){             matrix[i] = rows[i].FinElements("./td").toArray();                         }     } 

Thanks

Answer 1

Use the ElementAt(int) function with the index value.

Here is the MSDN link to the ElementAt(int) function https://msdn.microsoft.com/en-us/library/bb299233(v=vs.110).aspx

Answer 2

I haven't been using read only collections, but from the MSDN documentation, it looks like it's possible to get element at given index, using ElementAt method. It should work like that:

IReadOnlyCollection<IWebElement> rows = Driver.FindElements(By.XPath("./*/tr"));     int index = 1; // sample  var row = rows.ElementAt(index) 

You might need to add using System.Linq; statement in your class, because ElementAt() is an extension method provided by Linq.