Specification Pattern implementation
- Create a new specification based on a class, pass into the constructor parameters and business logic as a boolean function
public class OlderThanSpecification : ExpressionSpecification<UserModel>
{
public OlderThanSpecification(int threshold) : base(user => user.Age > threshold)
{
}
}- Use this lambda function wrapper like this
var olderSpecification = new OlderThanSpecification(30);
Console.WriteLine($"Are you a senior? {olderSpecification.IsSatisfied(user)}");- Use this lambda function wrapper like this
var olderSpecification = new OlderThanSpecification(30);
List<UserModel> users = _dataContext.UserModels.Where(olderSpecification).ToList();
var youngerSpecification = new YoungerThanSpecification(50);
List<UserModel> users30to50 = _dataContext.UserModels.Where(olderSpecification.And(youngerSpecification).ToList();
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