passing Multiple conditions to LINQ FirstOrDefault Method

Question

I have a list of gelolocations. I want to perform 2 conditions on the list and select the ones which satisfy those conditions. I cannot figure out how to do that.

public class GeolocationInfo
{
    public string Postcode { get; set; }

    public decimal Latitude { get; set; }

    public decimal Longitude { get; set; }
}

var geolocationList = new List<GeolocationInfo>(); // Let's assume i have data in this list

I want to perform multiple conditions on this list geolocationList.

I want to use FirstOrDefault on this list on the conditions that PostCode property matching with the one supplied and Longitude, lattitude are not null.

    geolocationList .FirstOrDefault(g => g.PostCode  == "AB1C DE2"); 
// I want to add multiple conditions like  g.Longitude != null && g.Lattitude != null in the same expression

I want to build this conditions outside and pass it as a parameter to FirstOrDefault. e.g like building a Func<input, output> and passing this into.

Answer 1

Thanks for your response guys. It helped me think in the right way.

I did like this.

Func<GeolocationInfo, bool> expression = g => g.PostCode == "ABC" &&
                                              g.Longitude != null &&
                                              g.Lattitude != null;
geoLocation.FirstOrDefault(expression);

It worked and code is much better.