C# Reflection with enum array

Question

I have a class with custom enum:

public enum Capabilities{
 PowerSave= 1,
 PnP =2,
 Shared=3, }

My class

public class Device
{
       ....
  public Capabilities[] DeviceCapabilities
  {
     get { // logic goes here}
  }

Is there a way using reflection to get the value of this field during runtime? I tried the following but got null reference exception

PropertyInfo[] prs = srcObj.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
 foreach (PropertyInfo property in prs)
 {
     if (property.PropertyType.IsArray)
     {
         Array a = (Array)property.GetValue(srcObj, null);
     }    
 }

EDIT: Thanks for your answers, what I really need is a way to get the values dynamically without the need to specify the enum type. Something like:

string enumType = "enumtype"
var property = typeof(Device).GetProperty(enumType);

Is that possible?

what do you mean by get values of this field? Simply read that array and do what you want with it — Ilya Ivanov
– Ilya Ivanov, Commented Jan 9, 2013 at 17:08
Sounds like [Flags] is appropriate here: msdn.microsoft.com/en-us/library/system.flagsattribute.aspx — user27414
– user27414, Commented Jan 9, 2013 at 17:09
Do you have a stack trace to verify where the NullReferenceException is coming from? It looks like it may be coming from the logic in your DeviceCapabilities property, or from another property in your object. — Ian Newson
– Ian Newson, Commented Jan 9, 2013 at 17:15

Daniel Brückner · Accepted Answer · 2013-01-09 17:16:02Z

1

The following should do what you desire.

var property = typeof(Device).GetProperty("DeviceCapabilities");

var deviceCapabilities = (Capabilities[])property.GetValue(device);

Note that the method Object PropertyInfo.GetValue(Object) is new in .NET 4.5. In previous versions you have to add an additional argument for the indices.

var deviceCapabilities = (Capabilities[])property.GetValue(device, null);

edited Jan 9, 2013 at 17:16

answered Jan 9, 2013 at 17:09

Daniel Brückner

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Comments

Ian Newson · Accepted Answer · 2013-01-09 17:08:18Z

0

This should work:

    var source = new Device();

    var property = source.GetType().GetProperty("DeviceCapabilities");
    var caps = (Array)property.GetValue(source, null);

    foreach (var cap in caps)
        Console.WriteLine(cap);

answered Jan 9, 2013 at 17:08

Ian Newson

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samjudson · Accepted Answer · 2013-01-09 17:13:42Z

0

If you want to enumerate all the possible values of an Enum and return as an array then try this helper function:

public class EnumHelper {
    public static IEnumerable<T> GetValues<T>()
    {
        return Enum.GetValues(typeof(T)).Cast<T>();
    }
}

Then you can simply call:

Capabilities[] array = EnumHelper.GetValues<Capabilities>();

If that isn't what you are after then I'm not sure what you mean.

answered Jan 9, 2013 at 17:13

samjudson

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Deepak · Accepted Answer · 2013-03-23 20:37:18Z

0

You can try this

foreach (PropertyInfo property in prs)
{
    string[] enumValues = Enum.GetNames(property.PropertyType);
}

Hope it helps.

answered Mar 23, 2013 at 20:37

Deepak

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