I am trying to match an enumeration defined inside a class that is instantiated as an object with an Activator in the Compact Framework.
Code Snippet:
public class MyClass { public enum EnumeratedType : short { // Requests RequestA = 0x01, RequestB = 0x02, // Responses ResponseA = 0x11, ResponseB = 0x12, }; }The object is instantiated thus:
Type t = Type.GetType( "MyClass+EnumeratedType" ); object ob = Activator.CreateInstance( t );If ob is then set to, say, 0x11 by another operation, I need to access the string of the enumerated name, but so far I have had no luck.
With Reflection I can access the enumerated types in a FieldInfo array, which gives me an array of all the possible names, but there doesn't seem to be a value associated with these - which would make it easy to match and extract the name.
All I need something like:
string name = ob.EnumQualifiedName();Any suggestions would be appreciated!
Matching enumeration with reflection in Compact Framework
Guglielmo
Thanks for the reply.
Unfortunately System.Enum.GetName is not supported in the Compact Framework.
Kristin
wardw
For value -> name direction its very easy to get around using Enum.GetName:
class
Program{
enum EnumeratedType : short{
// RequestsRequestA = 0x01,
RequestB = 0x02,
// ResponsesResponseA = 0x11,
ResponseB = 0x12,
}
static void Main(string[] args){
Debug.Assert( "ResponseA" == GetName(typeof(EnumeratedType), 0x11));}
static string GetName(Type enumType, object value){
return Enum.ToObject(enumType, value).ToString();}
}
In the name -> value direction Enum.Parse will do what you need, but that one does require NETCFv2 I believe.
-Noah
.Net Compact Framework
martinhughes
That is exactly what I am looking for... many thanks!
I had implemented a temporary workaround using a custom attribute on each enumeration that contained its value, but the extraction code had to iterate through a FieldInfo array every time.
This is perfect!
Tally622
Oh, sorry. I didn't realize. They support fullblown reflection, but not a simple method like Enum.GetName Thats crazy...
Anyway, from your original post, are you saying that FieldInfo.GetValue is returning 0 or null for the fields that belong to the enum
Jeff Lewis
Hi,
Yes the compact framework is a little bizzare in what is implemented - and particularly what is not!
What I am saying is that if my object is set to a value, there seems to be no way to retrieve a string of the enumerated name associated with that value.
The FieldInfo array contains all of the enumerated types, and a GetValue on each type does indeed return a string of the name. However, I can't find a value associated with a particilar FieldInfo array element.
For Example, a GetValue on the FieldInfo for ResponseA returns its name, but there appears to be nothing to say that name is enumerated to 0x11.