CODEWITHSUNDEEP
c#listapigenericsmapping
dev_in_training
dev_in_training

Reputation: 443

How to map a property in C# that is a list?

These are my classes:

    public class Registration
    {
        public bool? IsRegistered { get; set; }
        public List<RegistrationProcess> RegistrationProcess { get; set; }
    }

    public class RegistrationProcess
    {
        public bool? PaidInFull { get; set; }
        public double PaymentAmount { get; set; }
        public bool IdentityVerified { get; set; }
    }

I have a method that is doing the object mapping like this:

public Registration Translate(Services.Registration source)
        {
            return new Registration
            {
                IsRegistered = source.IsRegistered,
                RegistrationProcess = new List<RegistrationProcess>
                {
                    new RegistrationProcess()
                    {
                        PaidInFull = source.RegistrationProcess.Select(o => o.HasPaid),
                        
                    }
                }
            };
        }

I am not sure how to set up the mapping for the RegistrationProcess. I want to map PaidInFull within RegistrationProcess to the property HasPaid. They are both bools. I am getting an error: Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<bool?>' to 'bool?' I feel like I need to add something to the end of the Select statement but I am not sure what. I did FirstOrDefault() and that made the error go away but I only got one value back and that is not what I want.

Upvotes: 0

Views: 2193

Answers (1)

NandoErni
NandoErni

Reputation: 111

The problem with your approach is that you are only creating one instance of RegistrationProcess inside the list constructor. So by calling source.RegistrationProcess.Select(o => o.HasPaid) and assign it to your newly created RegistrationProcess you are creating a Collection of all bool values of your service registration process and try to assign it to a single registration process.

The Solution is to create multiple RegistrationProcess instances. In fact, one for each element in source.RegistrationProcess. To do this you can use the Select method on source.RegistrationProcess directly:

source.RegistrationProcesses.Select(x => new RegistrationProcess() { PaidInFull = x.HasPaid }).ToList()

As you can see, for every element in source.RegistrationProcesses a new RegistrationProcess is created. Or in other words: you select the elements of source.RegistrationProcesses as new RegistrationProcess() { PaidInFull = x.HasPaid } if that makes more sense to you. The .ToList() converts the IEnumerable to a list.

Upvotes: 3

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