public static CreateObject CreateConstructorMethod(Type objType, TypeInfo objTypeInfo = null)
{
CreateObject c;
if (objTypeInfo == null)
objTypeInfo = objType.GetTypeInfo();
var n = objTypeInfo.Name + ".ctor";
if(objTypeInfo.IsClass)
{
var dynMethod = new DynamicMethod(n, objType, Type.EmptyTypes);
var ilGen = dynMethod.GetILGenerator();
var ct = objTypeInfo.GetConstructor(Type.EmptyTypes)
?? objTypeInfo.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null);
if (ct == null)
return null;
ilGen.Emit(OpCodes.Newobj, ct);
ilGen.Emit(OpCodes.Ret);
c = (CreateObject)dynMethod.CreateDelegate(typeof(CreateObject));
}
else
{
var dynMethod = new DynamicMethod(n, typeof(object), null, objType);
var ilGen = dynMethod.GetILGenerator();
var lv = ilGen.DeclareLocal(objType);
ilGen.Emit(OpCodes.Ldloca_S, lv);
ilGen.Emit(OpCodes.Initobj, objType);
ilGen.Emit(OpCodes.Ldloc_0);
ilGen.Emit(OpCodes.Box, objType);
ilGen.Emit(OpCodes.Ret);
c = (CreateObject)dynMethod.CreateDelegate(typeof(CreateObject));
}
return c;
}