Question

I’m sure there’s a better way to do this but I don’t know how. Could I use what they call reflection?

I want to order the resultList by the value in id where the id has the same value as the name of the property to order by.

var resultList = repository.GetPersons();

// Order the result based on the value in the string id
if (id == "organisation")
    resultList = resultList.OrderBy(p => p.organisation);
else if (id == "surname")
    resultList = resultList.OrderBy(p => p.surname);
else if (id == "lastname")
    resultList = resultList.OrderBy(p => p.lastname);
else if (id == "adress")
    resultList = resultList.OrderBy(p => p.adress);
}

Answer 1

This will surely helps you : Dynamic LINQ OrderBy using String Names!

Class

public class Person
{
   public DateTime DateOfBirth { get; set; }
    ....
}

Use

// First we define the parameter that we are going to use
// in our OrderBy clause. This is the same as "(person =>"
// in the example above.
var param = Expression.Parameter(typeof(Person), "person");

// Now we'll make our lambda function that returns the
// "DateOfBirth" property by it's name.
var mySortExpression = Expression.Lambda<Func<Person, object>>
                       (Expression.Property(param, "DateOfBirth"), param);

// Now I can sort my people list.
Person[] sortedPeople = people.OrderBy(mySortExpression).ToArray();