Can NDepend detect where string interpolation is used in C#?

Question

I'd like to enforce a rule that log statements do not use string interpolation:

Example Log($"Added {count} messages.");

Instead I want to encourage/force developers to use structured logging, which means passing values in as separate arguments to a Log method that supports this concept.

How would one use NDepend to do this, assuming it's possible? If not NDepend, can it be done with a Roslyn analyzer?

Answer 1

SerilogAnalyzer is a Roslyn-based analyzer that will do that for you.

Answer 2

Since string interpolation results in a call to System.String.Format(String,Object) you can write such a rule with NDepend CQLinq:

//<Name>Don't use string interpolation from Log method</Name>
warnif count > 0 
from m in Application.Methods where m.IsUsing ("System.String.Format(String,Object)")
where m.ParentNamespace.Name.Contains(".Log")
select m