When using the ConcurrentDictionary, there are many overloads of the GetOrAdd and AddOrUpdate methods that
take both a TKey argument and a lambda that expects a TKey parameter. This means that the right side of the lambda can be
written using either the lambda’s parameter or the method’s argument. However, using the method’s argument leads to the lambda capturing it, and the
compiler will need to generate a class and instantiate it before the call. This means memory allocations, as well as more time spend during Garbage
Collection.
What is the potential impact?
We measured a significant improvement both in execution time and memory allocation. For more details see the Benchmarks section from
the More info tab.
