How to use 'is' when type passed in through method?

Question

I am trying to pass a type through to a method where I can check if it 'is' a certain type. However the code I have below does not compile and I am wondering whats wrong. The compile error is: type or namespace name 'dataType' could not be found.

public static List<object> findType(Type dataType)
{
    List<object> items = new List<object>();
    foreach (KeyValuePair<int, object> entry in DataSource.ItemPairs)
    {
        if (entry.Value != null && entry.Value is dataType)
        {
            items.Add(entry.Value);
        }
    }
    return items;
}

Answer 1

is operator expects a type name, not the Type instance.So the type should be known at compile time.

However you can use, IsAssignableFrom method to check if the types are compatible:

if (entry.Value != null && dataType.IsAssignableFrom(entry.Value.GetType())