CODEWITHSUNDEEP
c#linqclassforeach
maksmara
maksmara

Reputation: 27

How to iterate through limited set of instance properties?

I have a class with huge number of properties but I want to alter only several of them. Could you suggest me how to implement functionality below:

var model = session.Load<MyType>(id);

foreach(var property in [model.RegistrationAddress, model.ResidenceAddress, model.EmploymentAddress, model.CorrespondenceAddress])
{
    // alter each of the given properties...
}

Upvotes: 0

Views: 95

Answers (1)

Patrick Hofman
Patrick Hofman

Reputation: 157116

When wrapping it in an object[] you can get all values, but you loose the knowledge of the property behind it.

foreach( var property in
            new object[]
            { model.RegistrationAddress
            , model.ResidenceAddress
            , model.EmploymentAddress
            , model.CorrespondenceAddress
            }
       )
{
    // alter each of the given properties...
}

You can use a Dictionary instead:

When wrapping it in an object[] you can get all values, but you loose the knowledge of the property behind it.

foreach( KeyValuePair<string, object> property in 
            new Dictionary<string, object>
            { { "RegistrationAddress", model.RegistrationAddress}
            , { "ResidenceAddress", model.ResidenceAddress } ...
            }
        )
{
    // alter each of the given properties...
}

Ideally, in the next version of c#, you can use nameof:

            new Dictionary<string, object>
            { { nameof(RegistrationAddress), model.RegistrationAddress}
            , { nameof(ResidenceAddress), model.ResidenceAddress } ...
            }

When you need to set the parameters, you can use something like this:

public class GetSet<T>
{
    public GetSet(Func<T> get, Action<T> set)
    {
        this.Get = get;
        this.Set = set;
    }

    public Func<T> Get { get; set; }

    public Action<T> Set { get; set; }
}

Call it like this:

ClassX x = new ClassX();

foreach (var p in new GetSet<string>[] { new GetSet<string>(() => { return x.ParameterX; }, o => { x.ParameterX = o; }) })
{
    string s = p.Get();

    p.Set("abc");
}

Upvotes: 2

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