public Task ExecuteAsync <TCommand>(TCommand command) where TCommand : ICommand
{
if (command == null)
{
throw new ArgumentNullException("command");
}
if (!command.Validate(_validationContext))
{
throw new ValidationErrorException(_validationContext.FormatValidationError());
}
var handler = _provider.GetService(typeof(ICommandHandler <TCommand>));
if (handler == null)
{
throw new CommandHandlerNotFoundException();
}
return((handler as ICommandHandler <TCommand>).ExecuteAsync(command));
}