If you want to get all resource string keys of resource string values from an embeded resource file in C# you can use this function:
(if the embeded resoure file contains a resourestring with key=[EmptyParameter] and value [This is an empty parameter], this function will return a generic List<string> with one value [EmptyParameter]

public static List<string> GetAllResourceStrings(ResourceFileNames resourceFileNames)
       {
           List<string> resourceStrings = new List<string>();
           FieldInfo[] fields = null;
           ResourceSet resourceSet = null;
           switch (resourceFileNames)
           {
               case ResourceFileNames.Exception:
                   resourceSet = ExceptionResources.ResourceManager.GetResourceSet(CultureInfo.CurrentCulture, true, true);
                   break;
               case ResourceFileNames.Gui:
                   resourceSet = GuiResources.ResourceManager.GetResourceSet(CultureInfo.CurrentCulture, true, true);
                   break;
           }
           IDictionaryEnumerator enumerator = resourceSet.GetEnumerator();
           while (enumerator.MoveNext())
           {
               resourceStrings.Add(enumerator.Key.ToString());
           }
           return resourceStrings;
       }

(ResourceFileNames resourceFileNames = a custom enumeration)

(ExceptionResources is the class generated by visual studio for the embeded resource file ExceptionResources.resx)

(GuiResourcesis the class generated by visual studio for the embeded resource file ExceptionResources.resx)