Microsoft.AspNetCore.SignalR.Hubs.ReflectedMethodDescriptorProvider.ExtractProgressParameter C# (CSharp) Method

        private static IEnumerable<ParameterInfo> ExtractProgressParameter(ParameterInfo[] parameters, out Type progressReportingType)
        {
            var lastParameter = parameters.LastOrDefault();
            progressReportingType = null;

            if (IsProgressType(lastParameter))
            {
                // This method takes an IProgress<T> as the last parameter and thus supports progress reporting
                progressReportingType = lastParameter.ParameterType.GenericTypeArguments[0];

                // Strip the IProgress<T> param from the method descriptor params list
                // as we don't want to include it when trying to match methods
                return parameters.Take(parameters.Length - 1);
            }

            return parameters;
        }