System.Xml.Serialization.XmlSerializationReaderCodeGen.WriteDerivedSerializable C# (CSharp) Method

        private void WriteDerivedSerializable(SerializableMapping head, SerializableMapping mapping, string source, bool isWrappedAny)
        {
            if (mapping == null)
                return;
            for (SerializableMapping derived = mapping.DerivedMappings; derived != null; derived = derived.NextDerivedMapping)
            {
                Writer.Write("else if (tser == null");
                Writer.Write(" || ");
                WriteQNameEqual("tser", derived.XsiType.Name, derived.XsiType.Namespace);

                Writer.WriteLine(") {");
                Writer.Indent++;

                if (derived.Type != null)
                {
                    if (head.Type.IsAssignableFrom(derived.Type))
                    {
                        WriteSourceBeginTyped(source, head.TypeDesc);
                        Writer.Write("ReadSerializable(( ");
                        Writer.Write(typeof(IXmlSerializable).FullName);
                        Writer.Write(")");
                        Writer.Write(RaCodeGen.GetStringForCreateInstance(derived.TypeDesc.CSharpName, derived.TypeDesc.UseReflection, derived.TypeDesc.CannotNew, false));
                        if (isWrappedAny)
                        {
                            Writer.WriteLine(", true");
                        }
                        Writer.Write(")");
                        WriteSourceEnd(source);
                        Writer.WriteLine(";");
                    }
                    else
                    {
                        Writer.Write("throw CreateBadDerivationException(");
                        WriteQuotedCSharpString(derived.XsiType.Name);
                        Writer.Write(", ");
                        WriteQuotedCSharpString(derived.XsiType.Namespace);
                        Writer.Write(", ");
                        WriteQuotedCSharpString(head.XsiType.Name);
                        Writer.Write(", ");
                        WriteQuotedCSharpString(head.XsiType.Namespace);
                        Writer.Write(", ");
                        WriteQuotedCSharpString(derived.Type.FullName);
                        Writer.Write(", ");
                        WriteQuotedCSharpString(head.Type.FullName);
                        Writer.WriteLine(");");
                    }
                }
                else
                {
                    Writer.WriteLine("// " + "missing real mapping for " + derived.XsiType);
                    Writer.Write("throw CreateMissingIXmlSerializableType(");
                    WriteQuotedCSharpString(derived.XsiType.Name);
                    Writer.Write(", ");
                    WriteQuotedCSharpString(derived.XsiType.Namespace);
                    Writer.Write(", ");
                    WriteQuotedCSharpString(head.Type.FullName);
                    Writer.WriteLine(");");
                }

                Writer.Indent--;
                Writer.WriteLine("}");

                WriteDerivedSerializable(head, derived, source, isWrappedAny);
            }
        }