System.Xml.Serialization.Globals.NotSupported C# (CSharp) Method

        internal static Exception NotSupported(string msg)
        {
            System.Diagnostics.Debug.Assert(false, msg);
            return new NotSupportedException(msg);
        }
    }

        private void RetrieveSerializableSchema()
        {
            if (_needSchema)
            {
                _needSchema = false;
                if (_getSchemaMethod != null)
                {
                    // get the type info
                    object typeInfo = _getSchemaMethod.Invoke(null, new object[] { _schemas });
                    _xsiType = XmlQualifiedName.Empty;

                    if (typeInfo != null)
                    {
                        if (typeof(XmlSchemaType).IsAssignableFrom(_getSchemaMethod.ReturnType))
                        {
                            throw Globals.NotSupported("No XmlSchemaType in SL");
                        }
                        else if (typeof(XmlQualifiedName).IsAssignableFrom(_getSchemaMethod.ReturnType))
                        {
                            _xsiType = (XmlQualifiedName)typeInfo;
                            if (_xsiType.IsEmpty)
                            {
                                throw new InvalidOperationException(SR.Format(SR.XmlGetSchemaEmptyTypeName, _type.FullName, _getSchemaMethod.Name));
                            }
                        }
                        else
                        {
                            throw new InvalidOperationException(SR.Format(SR.XmlGetSchemaMethodReturnType, _type.Name, _getSchemaMethod.Name, typeof(XmlSchemaProviderAttribute).Name, typeof(XmlQualifiedName).FullName));
                        }
                    }
                    else
                    {
                        _any = true;
                    }
                }
            }
        }