Question:
Is Dictionary<KeyType,ValueType> thread-safe for reading and iterating over values?
That is, there will be no entry in this Dictionary (it is initialized only when the project is launched), and I want to understand whether it can be used in the context of a singleton service in ASP.NET Core 2.0?
Answer:
https://msdn.microsoft.com/en-us/library/xfhwa508(v=vs.110).aspx
thread safety
A Dictionary can support multiple readers concurrently, as long as the collection is not modified.
that is
thread safety
…supports multiple concurrent reads, as long as the data doesn't change.