/// <summary>
/// Validates the command.
/// </summary>
/// <param name="command">The command to validate.</param>
/// <returns>An enumeration of validation results.</returns>
public IEnumerable <ValidationResult> Validate(IValidatableObject command)
{
if (command.IsNull())
{
return(null);
}
var validationResult = new List <ValidationResult>();
Validator.TryValidateObject(command, new ValidationContext(command, null, null), validationResult, true);
return(validationResult);
}