Code Inspection: Merge sequential checks in && or || expressions

If you do a null comparison or similar checks, for example use HasValue, in the left part of a conditional-AND (&&) or a conditional-OR (||) operation, and then make some other check with this symbol or its members in the right part, ReSharper often suggests to simplify this operation by merging the two sequential checks. In most cases, the null-conditional operator (?.), introduced in C# 6.0, helps to do this.

Here are some examples of transformations that ReSharper suggests:

• if (p == null || p.Arguments == null) > if (p?.Arguments == null)

• if (t != null && t.Value is TimeSpan) > if (t?.Value is TimeSpan)

• if (arg != null && arg is IConvertible) > if (arg is IConvertible)