How to get the value of a field c#

Question

I'm using Unity and i have a class full of gameObjects, i want to take an instance of that class and compare all the values against one i already have. However in order to do this i need to have the filed value, how do i get this?, Here's my curent code:

void UpdatePage() {
  foreach(FieldInfo field in Pages.GetType().GetFields(BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance)) {
    Page = field.GetValue();
  }

}

_"filed value"_? Is that a typo? Did you mean "field value"? — Wyck, Aug 30 '20 at 00:02
Does this answer your question? [C# Reflection - Get field values from a simple class](https://stackoverflow.com/questions/7649324/c-sharp-reflection-get-field-values-from-a-simple-class) — devNull, Aug 30 '20 at 00:02
I would recommend changing your strategy completely. Do not make the fields you are calling static, instead make them instance singletons instead. This will let you hold a `Page[]` in `Pages` and you can foreach over the array instead of being forced to use reflection. — Scott Chamberlain, Aug 30 '20 at 00:06
why even use reflection for this? I would rather implement `Equals` in the class itself where you have access to all private fields anyway... could you please post a minimal **complete** working code so we can reproduce your situation? — derHugo, Aug 30 '20 at 14:44

score 2 · Accepted Answer · answered Aug 30 '20 at 00:06

The GetField() method requires an instance argument:

var val = field.GetValue(Pages);

Here's a self-contained example (also a link to .NET Fiddle):

using System;
using System.Reflection;

public class Program
{
    public static void Main()
    {
        var item = new SomeType();
        item.FieldA = "hi";
        item.FieldB = "bye";
        
        foreach(var field in item.GetType().GetFields(BindingFlags.Instance | BindingFlags.Public)) {
            var val = field.GetValue(item);
            Console.WriteLine("In the 'item' instance, field " + field.Name + " has value " + val);
        }
    }
}

public class SomeType {
    public string FieldA;
    public string FieldB;
}

score 0 · Answer 2 · answered Aug 30 '20 at 00:03

0

You need to pass the target instance to GetValue() (null for static fields):

Page = field.GetValue(field.IsStatic ? null : Pages);

answered Aug 30 '20 at 00:03

Mathias R. Jessen

157,619
12
148
206

How to get the value of a field c#

2 Answers2