Question

I have an object model that contains several lists of other objects. I want to loop thought every object in the lists and execute a method on them. The method is called MyMethod and every object in the lists has this method in its class definition.

This is what I have:

public class MyObject
{
  public List<NestedObject1> ListNestedObject1 { get; set; }
  public List<NestedObject2> ListNestedObject2 { get; set; }

  public void ExecuteMethodsOfNestedObjectLists()
  {
    if (ListNestedObject1.Count > 0) { from a in ListNestedObject1 a.MyMethod();}
    if (ListNestedObject2.Count > 0) { from a in ListNestedObject2 a.MyMethod();}
  }
}

I’m looking to test the length of each list of nested object and execute MyMethod over each element. I know I could do a foreach loop but I want to see how to use linq syntax to keep it short.

How do I rewrite this to make it work?

Thanks.

Answer 1

So you’re asking how to execute this method for every nested object?

ListNestedObject1.ForEach(obj => obj.MyMethod());
ListNestedObject2.ForEach(obj => obj.MyMethod()); 

Note: List.ForEach is not LINQ(although it has a similar appearance) and was introduced in .NET 2.0.