Consider the following code listing
This code shows an Open File Dialog and then attempts to asynchronously process the chosen files. However, what the developer has missed is that the BeginInvoke() method actually takes a params object argument, to which the developer is passing an array of strings. As a consequence, ReSharper offers a warning, saying that the covariant array conversion from string to object may cause an exception at run-time.
The issue with the above code is easily resolved: since BeginInvoke() expects to receive an array of all the parameters and there is only one parameter (string files), all we have to do is provide exactly that, i.e.,