System.Runtime.Serialization.CodeGenerator.EndSwitch C# (CSharp) Method

        internal void EndSwitch()
        {
            object stackTop = _blockStack.Pop();
            SwitchState switchState = stackTop as SwitchState;
            if (switchState == null)
                ThrowMismatchException(stackTop);
            if (_codeGenTrace != CodeGenTrace.None)
                EmitSourceInstruction("} //end switch");
            if (!switchState.DefaultDefined)
                MarkLabel(switchState.DefaultLabel);
            MarkLabel(switchState.EndOfSwitchLabel);
        }

            private void ReadMembers(ClassDataContract classContract, LocalBuilder extensionDataLocal)
            {
                int memberCount = classContract.MemberNames.Length;
                _ilg.Call(_contextArg, XmlFormatGeneratorStatics.IncrementItemCountMethod, memberCount);

                LocalBuilder memberIndexLocal = _ilg.DeclareLocal(Globals.TypeOfInt, "memberIndex", -1);

                int firstRequiredMember;
                bool[] requiredMembers = GetRequiredMembers(classContract, out firstRequiredMember);
                bool hasRequiredMembers = (firstRequiredMember < memberCount);
                LocalBuilder requiredIndexLocal = hasRequiredMembers ? _ilg.DeclareLocal(Globals.TypeOfInt, "requiredIndex", firstRequiredMember) : null;

                object forReadElements = _ilg.For(null, null, null);
                _ilg.Call(null, XmlFormatGeneratorStatics.MoveToNextElementMethod, _xmlReaderArg);
                _ilg.IfFalseBreak(forReadElements);
                if (hasRequiredMembers)
                    _ilg.Call(_contextArg, XmlFormatGeneratorStatics.GetMemberIndexWithRequiredMembersMethod, _xmlReaderArg, _memberNamesArg, _memberNamespacesArg, memberIndexLocal, requiredIndexLocal, extensionDataLocal);
                else
                    _ilg.Call(_contextArg, XmlFormatGeneratorStatics.GetMemberIndexMethod, _xmlReaderArg, _memberNamesArg, _memberNamespacesArg, memberIndexLocal, extensionDataLocal);
                Label[] memberLabels = _ilg.Switch(memberCount);
                ReadMembers(classContract, requiredMembers, memberLabels, memberIndexLocal, requiredIndexLocal);
                _ilg.EndSwitch();
                _ilg.EndFor();
                if (hasRequiredMembers)
                {
                    _ilg.If(requiredIndexLocal, Cmp.LessThan, memberCount);
                    _ilg.Call(null, XmlFormatGeneratorStatics.ThrowRequiredMemberMissingExceptionMethod, _xmlReaderArg, memberIndexLocal, requiredIndexLocal, _memberNamesArg);
                    _ilg.EndIf();
                }
            }