Multiple ForEachs, Possible To Avoid With LINQ?

Question

I am wondering about getting rid of some nested foreach's in my code using LINQ. For example, assume the following code:

                  <pre>  IEnumerable<MyObject1> MyObject1Collection = SomeCollection.Cast<MyObject1>()
                    foreach (MyObject1 obj1 in MyObject1Collection)
                    {
                        foreach (MyObject2 obj2 in MyObject1.MyObject2Collection)                           {                           

if (MyObject2.IsFalse)
{
// Do Stuff
}

}
                    }

Is there a better way to do this with LINQ?

TIA!

Answer 1

There are two ways to do this: method syntax and query syntax:

List<object> SomeCollection = new List<object>();

var methodsyntax = SomeCollection.OfType<MyObject1>().SelectMany(x => x.MyObject2Collection).Where(x => x.IsFalse);

var querysyntax = from obj1 in SomeCollection.OfType<MyObject1>()
                  from obj2 in obj1.MyObject2Collection
                  where obj2.IsFalse
                  select obj2;

// use a foreach loop here.

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