Properties should not return arrays (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1819)

Rename type name ResponseHandlerDelegate so that it does not end in 'Delegate' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1711)

Random is an insecure random number generator. Use cryptographically secure random number generators when randomness is required for security. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca5394)

Exception type System.IndexOutOfRangeException is reserved by the runtime (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2201)

Prefer comparing 'Count' to 0 rather than using 'Any()', both for clarity and for performance (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1860)

Random is an insecure random number generator. Use cryptographically secure random number generators when randomness is required for security. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca5394)

Prefer comparing 'Count' to 0 rather than using 'Any()', both for clarity and for performance (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1860)

Prefer comparing 'Count' to 0 rather than using 'Any()', both for clarity and for performance (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1860)

Change type of field '_items' from 'System.Collections.Generic.IDictionary<System.Type, object>' to 'System.Collections.Generic.Dictionary<System.Type, object>' for improved performance (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1859)