XNA Framework

Re: System.Enum Doesn't Have GetValues On Xbox 360?

UberGeekGames — Wed, 14 Oct 2009 20:18:06 GMT

I haven't touched LINQ so using that bit of code as a replacement for Enum.GetValues was more difficult than I expected, so here's a method that actually gets the enum's names and puts them into a string array for you:

    
            public static string[] GetEnumNames<T>() 
        
            { 
        
                IEnumerable<T> tx = (from x in typeof(T).GetFields(BindingFlags.Static | BindingFlags.Public) 
        
                        select (T)x.GetValue(null)); 
        
                List<T> rx = tx.ToList(); 
        
                List<string> s = new List<string>(); 
        
                foreach (T t in rx) 
        
                     s.Add(t.ToString()); 
        
                return s.ToArray(); 
        
            }

It's probably not that efficient but I was quickly hacking it together and figured someone else might benefit.

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Nick Gravelyn — Wed, 01 Apr 2009 15:44:24 GMT

SwiftFalcn:
Actually as far as I understand it your linq query syntax just gets rewritten to his extension method by the compiler. but whatever all the same.

It does, but LINQ is the query syntax so if you just use the extension methods it's not technically LINQ. That's all I was pointing out.

Re: System.Enum Doesn't Have GetValues On Xbox 360?

SwiftFalcn — Wed, 01 Apr 2009 08:38:05 GMT

Actually as far as I understand it your linq query syntax just gets rewritten to his extension method by the compiler. but whatever all the same.

Good to know about GetValues. The compact framework seems to be restrictive in the most unexpected ways.

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Nick Gravelyn — Tue, 31 Mar 2009 20:18:24 GMT

That's not quite LINQ since you're just using the Select extension method. If you want LINQ it'd be like this:

    
            public static IEnumerable<T> GetValues<T>() 
        
            { 
        
               return (from x in typeof(T).GetFields(BindingFlags.Static | BindingFlags.Public) 
        
                       select (T)x.GetValue(null)); 
        
            }

using that awesome query syntax. :)

And yeah, I could have put it on one line, but I like breaking up each part of my LINQ queries.

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Zaknafein — Tue, 31 Mar 2009 20:07:35 GMT

Thread resurrection go!

Here's a LINQ version of that method, because it's fun and takes up a single line.

                            public static IEnumerable<T> GetValues<T>()         
            {         
                return typeof(T).GetFields(BindingFlags.Static | BindingFlags.Public).Select(x => (T)x.GetValue(null));         
            }         

And I would as well prefer a reference implementation of the method in the Xbox assemblies... I'll make a Connect entry.

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Matthew Doucette — Fri, 14 Nov 2008 18:54:21 GMT

RocketCanGames:

        FieldInfo[ fields = currentEnum.GetFields(BindingFlags.Static | BindingFlags.Public);

Just a note to anyone else coming into this thread, that if you do not specify "BindingFlags.Static | BindingFlags.Public", then .GetFields() will return an extra field. For me, the extra field is: [0] = {Int32 value__}

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Matthew Doucette — Fri, 14 Nov 2008 16:54:03 GMT

I solved it (my previous post) with type casting (which removes range checking):

    
            enemyType tempEnemyType = (enemyType)2;  
        
            string tempStr = ((enemyType)2).ToString();

Is there a better solution?

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Matthew Doucette — Fri, 14 Nov 2008 16:04:57 GMT

I have also run into need for .GetValues(). I always seem to want more power with my enums than I am allowed to have.

In my enemy type enum, if I use an index from 0..numEnemyTypes-1, can I used this index to access the type and its string name?

Basically, I want to do this:

    
            enemyType tempEnemyType = enemyType[2]  
        
            string tempStr = enemyType[2].ToString()

Where enemyType is an enum of enemy types:

    
            enum enemyType  
        
            {  
        
            redEnemy,  
        
            greenEnemy,  
        
            ...  
        
            }

Re: System.Enum Doesn't Have GetValues On Xbox 360?

RocketCanGames — Fri, 11 Jul 2008 01:23:19 GMT

A small update to the function. By making it a generic function, I'm able to return the exact type in a List. Also, instead of throwing
an exception, I just return an empty List.
 
     public static List<T> GetValues<T>()
    {
      Type currentEnum = typeof(T);
      List<T> resultSet = new List<T>();
      if (currentEnum.IsEnum)
      {
        FieldInfo[ fields = currentEnum.GetFields(BindingFlags.Static | BindingFlags.Public);
        foreach (FieldInfo field in fields)
          resultSet.Add((T)field.GetValue(null));
      }

      return resultSet;
    }

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Nick Gravelyn — Thu, 03 May 2007 22:42:42 GMT

Thanks. Works great on PC and compiles for 360 so I'm going to guess that it works. Thanks a lot.

Re: System.Enum Doesn't Have GetValues On Xbox 360?

justastro — Thu, 03 May 2007 22:40:10 GMT

Nick Gravelyn:
justastro:

I wrote a function for this and it works fine on both Windows and XB360 so far.

(Why the code snippet function in the forum is not work?!)

public static Enum[] GetEnumValues(Type enumType)
{
if (enumType.BaseType == typeof(Enum))
{
    FieldInfo[] info = enumType.GetFields(BindingFlags.Static | BindingFlags.Public);
    Enum[] values = new Enum[info.Length];
    for (int i=0; i<values.Length; ++i)
    {
      values[i] = (Enum)info[i].GetValue(null);
    }
    return values;
}
else
{
     throw new Exception("Given type is not an Enum type");
}
}

BTW, this function is so useful and I wonder why it is not supported in the .NET CF?

It looks promising, but when I compile I get errors about FieldInfo and BindingFlags. Where are those defined?

The code needs reflection

using System.Reflection;

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Nick Gravelyn — Thu, 03 May 2007 22:33:14 GMT

justastro:
I wrote a function for this and it works fine on both Windows and XB360 so far.

(Why the code snippet function in the forum is not work?!)

public static Enum[] GetEnumValues(Type enumType)
{
if (enumType.BaseType == typeof(Enum))
{
    FieldInfo[] info = enumType.GetFields(BindingFlags.Static | BindingFlags.Public);
    Enum[] values = new Enum[info.Length];
    for (int i=0; i<values.Length; ++i)
    {
      values[i] = (Enum)info[i].GetValue(null);
    }
    return values;
}
else
{
     throw new Exception("Given type is not an Enum type");
}
}

BTW, this function is so useful and I wonder why it is not supported in the .NET CF?

It looks promising, but when I compile I get errors about FieldInfo and BindingFlags. Where are those defined?

Re: System.Enum Doesn't Have GetValues On Xbox 360?

justastro — Thu, 03 May 2007 22:27:38 GMT

I wrote a function for this and it works fine on both Windows and XB360 so far.

(Why the code snippet function in the forum is not work?!)

using System.Reflection;

public static Enum[] GetEnumValues(Type enumType)
{
if (enumType.BaseType == typeof(Enum))
{
    FieldInfo[] info = enumType.GetFields(BindingFlags.Static | BindingFlags.Public);
    Enum[] values = new Enum[info.Length];
    for (int i=0; i<values.Length; ++i)
    {
      values[i] = (Enum)info[i].GetValue(null);
    }
    return values;
}
else
{
     throw new Exception("Given type is not an Enum type");
}
}

BTW, this function is so useful and I wonder why it is not supported in the .NET CF?

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Nick Gravelyn — Thu, 03 May 2007 22:01:43 GMT

Shawn Hargreaves:

If this was me, though, I'd just pass in the maximum value as a parameter when constructing my menu.

How would that work? I need to get all the values for the Enum.

Edit:
I decided to try my above solution by compiling it for Windows, and it wouldn't compile for Windows. It compiled at least for 360, but when I try compiling it for Windows I get this error:

The type or namespace name 'type' could not be found (are you missing a using directive or an assembly reference?)

Re: System.Enum Doesn't Have GetValues On Xbox 360?

Shawn Hargreaves — Thu, 03 May 2007 15:10:21 GMT

I don't think just casting an integer to an enum will work - that will actually succeed even if the value isn't in the enum. You could probably hack together some kind of check doing a ToString on the resulting enum to see if that gives back anything sensible.

If this was me, though, I'd just pass in the maximum value as a parameter when constructing my menu.