public ICommand GetCommand()

in Source/NuGetGallery.Operations/Infrastructure/CommandManager.cs [21:53]
27 lines of code
7 McCabe index (conditional complexity)

        public ICommand GetCommand(string commandName)
        {
            if (String.IsNullOrEmpty(commandName))
            {
                throw new ArgumentException(CommonResources.Argument_Cannot_Be_Null_Or_Empty, commandName);
            }

            IEnumerable<ICommand> results = from command in _commands
                                            where command.CommandAttribute.CommandName.StartsWith(commandName, StringComparison.OrdinalIgnoreCase) ||
                                            (command.CommandAttribute.AltName ?? String.Empty).StartsWith(commandName, StringComparison.OrdinalIgnoreCase)
                                            select command;

            if (!results.Any())
            {
                throw new CommandLineException(TaskResources.UnknownCommandError, commandName);
            }

            var matchedCommand = results.First();
            if (results.Skip(1).Any())
            {
                // Were there more than one results found?
                matchedCommand = results.FirstOrDefault(c => c.CommandAttribute.CommandName.Equals(commandName, StringComparison.OrdinalIgnoreCase)
                    || commandName.Equals(c.CommandAttribute.AltName, StringComparison.OrdinalIgnoreCase));

                if (matchedCommand == null)
                {
                    // No exact match was found and the result returned multiple prefixes.
                    throw new CommandLineException(String.Format(CultureInfo.CurrentCulture, TaskResources.AmbiguousCommand, commandName,
                        String.Join(" ", from c in results select c.CommandAttribute.CommandName)));
                }
            }
            return matchedCommand;
        }