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POC# output a defined class to a dynamic module using Reflection.Emit
 

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  1. POC# output a defined class to a dynamic module using Reflection.Emit
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    <p>Microsoft shows how to create a dynamic class here:</p> <p><a href="http://msdn.microsoft.com/en-us/library/system.reflection.emit.modulebuilder(v=vs.71).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.reflection.emit.modulebuilder(v=vs.71).aspx</a></p> <p>This defines a custom object, where they define a constructor and a method. I have a class defined, is there a way to emit the class I have already written instead of trying to write it as the example shows?</p> <p>Thanks FacticiusVir, it's nearly complete. However it doesn't seem to be quite there, 'Countries.USA is not supported by the language'</p> <p>Full code including FacticiusVir's answer:</p> <pre><code>class DynamicEnums { public static void Main() { AppDomain domain = AppDomain.CurrentDomain; AssemblyName aName = new AssemblyName("DynamicEnums"); AssemblyBuilder ab = domain.DefineDynamicAssembly(aName, AssemblyBuilderAccess.Save); ModuleBuilder mb = ab.DefineDynamicModule(aName.Name, aName.Name + ".dll"); ConstructorInfo referenceObjectConstructor = typeof(ReferenceObject).GetConstructor(new[] { typeof(int) }); List&lt;Type&gt; types = new List&lt;Type&gt;(); foreach(ReferenceType rt in GetTypes()) { TypeBuilder tb = mb.DefineType(rt.Name, TypeAttributes.Public); ConstructorBuilder staticConstructorBuilder = tb.DefineConstructor(MethodAttributes.Public | MethodAttributes.Static, CallingConventions.Standard, Type.EmptyTypes); ILGenerator staticConstructorILGenerator = staticConstructorBuilder.GetILGenerator(); foreach (Reference r in GetReferences(rt.ID)) { string name; if (rt.Name == "Countries") name = r.Abbreviation.Trim(); else if (rt.Name == "PermanentFundDividends") name = "Year" + r.Abbreviation.Trim(); else name = NameFix(r.Name); // Create a public, static, readonly field to store the // named ReferenceObject. FieldBuilder referenceObjectField = tb.DefineField(name, typeof(ReferenceObject), FieldAttributes.Static | FieldAttributes.Public | FieldAttributes.InitOnly); // Add code to the static constructor to populate the // ReferenceObject field: // Load the ReferenceObject's ID value onto the stack as a // literal 4-byte integer (Int32). staticConstructorILGenerator.Emit(OpCodes.Ldc_I4, r.ID); // Create a reference to a new ReferenceObject on the stack // by calling the ReferenceObject(int32 pValue) reference // we created earlier. staticConstructorILGenerator.Emit(OpCodes.Newobj, referenceObjectConstructor); // Store the ReferenceObject reference to the static // ReferenceObject field. staticConstructorILGenerator.Emit(OpCodes.Stsfld, referenceObjectField); } staticConstructorILGenerator.Emit(OpCodes.Ret); types.Add(tb.CreateType()); } try { ab.Save(aName.Name + ".dll"); } catch (Exception) { Console.WriteLine("Could not save .dll, file must already be loaded."); } foreach (Type t in types) { foreach (FieldInfo o in t.GetFields()) { Console.WriteLine("{0}.{1} = {2}", t, o.Name, "Later"); //Don't know how to get Value doing it this way } Console.WriteLine(); //Console.ReadKey(); } Console.WriteLine(); Console.WriteLine("Dynamic Enums Built Successfully."); //Console.ReadKey(); } public static List&lt;ReferenceType&gt; GetTypes() { List&lt;ReferenceType&gt; referenceTypes = new List&lt;ReferenceType&gt;(); referenceTypes.Add(new ReferenceType { ID = 1, Name = "Countries" }); return referenceTypes; } public static List&lt;Reference&gt; GetReferences(int typeID) { List&lt;Reference&gt; references = new List&lt;Reference&gt;(); references.Add(new Reference { ID = 120, Abbreviation = "USA" }); return references; } public struct ReferenceType { public int ID; public string Name; } public struct Reference { public int ID; public int TypeID; public string Abbreviation; public string Name; } public static string NameFix(string name) { //Strip all non alphanumeric characters string r = Regex.Replace(name, @"[^\w]", ""); //Enums cannot begin with a number if (Regex.IsMatch(r, @"^\d")) r = "N" + r; return r; } } public class ReferenceObject { private readonly int value; public ReferenceObject(int pValue) { value = pValue; } public override string ToString() { return value.ToString(); } public int Value() { return value; } public int ID() { return value; } #region == Operator public static bool operator ==(int objLeft, ReferenceObject objRight) { return objLeft == objRight.value; } public static bool operator ==(ReferenceObject objLeft, int objRight) { return objLeft.value == objRight; } public static bool operator ==(string objLeft, ReferenceObject objRight) { return objLeft == objRight.value.ToString(); } public static bool operator ==(ReferenceObject objLeft, string objRight) { return objLeft.value.ToString() == objRight; } #endregion #region != Operator public static bool operator !=(int objLeft, ReferenceObject objRight) { return objLeft != objRight.value; } public static bool operator !=(ReferenceObject objLeft, int objRight) { return objLeft.value != objRight; } public static bool operator !=(string objLeft, ReferenceObject objRight) { return objLeft != objRight.value.ToString(); } public static bool operator !=(ReferenceObject objLeft, string objRight) { return objLeft.value.ToString() != objRight; } #endregion public override bool Equals(object obj) { if ((obj is ReferenceObject)) return value == ((ReferenceObject)obj).value; if ((obj is int)) return value == (int)obj; if ((obj is string)) return value.ToString() == (string)obj; return false; } public override int GetHashCode() { return value; } } </code></pre>
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    1. COYour `Countries` object, as written, does not compile. Do you want a Countries class that contains a set of named fields, each of which is a ReferencedObject? If you can given a compilable example in C# of what you want, it'll be easier to work out the Reflection.Emit code for it.
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    2. COAlso, do you have definitions for ReferenceType & Reference?
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    3. COThe example you've given doesn't produce the error you've described - what specifically gives you "Countries.USA is not supported by the language"?
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