Question

Similar: How can I access an instance field in an abstract parent class via reflection?, but only in name, no one actually uses or references reflection there.

Constraints:

C#

Must use an abstract class to inherit from

Must be able to pass in string as field identifier (willing to negotiate)

public class ViewModel : BaseClass
{
 public Car Car { get; set; }
}
public abstract class BaseClass
{
 public object GetField(string field){
  //return Car if .GetField("Car") is called
 }
}

I assume this requires reflection but couldn’t quite wrap my head around it. How can access the field Car as in this example?

Answer 1

Try this:

[TestFixture]
public class TravisSerialisationTest
{
    [Test]
    public void GetPropertyValueTest()
    {
        var volvo = "Volvo";
        var viewModel = new ViewModel() { Car = volvo };
        var field = viewModel.GetField(() => viewModel.Car);
        Assert.AreEqual(volvo,field);
    }
}

public class ViewModel : BaseClass
{
    public string Car { get; set; }
}

public abstract class BaseClass
{
    public T GetField<T>(Expression<Func<T>> propertyExpression )
    {
        return propertyExpression.Compile().Invoke();
    }
}