System.Xml.Serialization.CodeExporter.PromoteType C# (CSharp) Method

        internal static object PromoteType(Type type, object value) {
            if (type == typeof(sbyte)) {
                return ((IConvertible)value).ToInt16(null);
            }
            else if (type == typeof(UInt16)) {
                return ((IConvertible)value).ToInt32(null);
            }
            else if (type == typeof(UInt32)) {
                return ((IConvertible)value).ToInt64(null);
            }
            else if (type == typeof(UInt64)) {
                return ((IConvertible)value).ToDecimal(null);
            }
            else {
                return value;
            }
        }

        private CodeAttributeArgument[] GetDefaultValueArguments(PrimitiveMapping mapping, object value, out CodeExpression initExpression)
        {
            initExpression = null;
            if (value == null)
            {
                return(null);
            }
            CodeExpression left        = null;
            CodeExpression expression2 = null;
            Type           type        = value.GetType();

            CodeAttributeArgument[] argumentArray = null;
            if (mapping is EnumMapping)
            {
                if (((EnumMapping)mapping).IsFlags)
                {
                    string[] strArray = ((string)value).Split(null);
                    for (int i = 0; i < strArray.Length; i++)
                    {
                        if (strArray[i].Length != 0)
                        {
                            CodeExpression right = new CodeFieldReferenceExpression(new CodeTypeReferenceExpression(mapping.TypeDesc.FullName), strArray[i]);
                            if (left != null)
                            {
                                left = new CodeBinaryOperatorExpression(left, CodeBinaryOperatorType.BitwiseOr, right);
                            }
                            else
                            {
                                left = right;
                            }
                        }
                    }
                }
                else
                {
                    left = new CodeFieldReferenceExpression(new CodeTypeReferenceExpression(mapping.TypeDesc.FullName), (string)value);
                }
                initExpression = left;
                argumentArray  = new CodeAttributeArgument[] { new CodeAttributeArgument(left) };
            }
            else if (((type == typeof(bool)) || (type == typeof(int))) || ((type == typeof(string)) || (type == typeof(double))))
            {
                initExpression = left = new CodePrimitiveExpression(value);
                argumentArray  = new CodeAttributeArgument[] { new CodeAttributeArgument(left) };
            }
            else if (((type == typeof(short)) || (type == typeof(long))) || (((type == typeof(float)) || (type == typeof(byte))) || (type == typeof(decimal))))
            {
                left           = new CodePrimitiveExpression(Convert.ToString(value, NumberFormatInfo.InvariantInfo));
                expression2    = new CodeTypeOfExpression(type.FullName);
                argumentArray  = new CodeAttributeArgument[] { new CodeAttributeArgument(expression2), new CodeAttributeArgument(left) };
                initExpression = new CodeCastExpression(type.FullName, new CodePrimitiveExpression(value));
            }
            else if (((type == typeof(sbyte)) || (type == typeof(ushort))) || ((type == typeof(uint)) || (type == typeof(ulong))))
            {
                value          = CodeExporter.PromoteType(type, value);
                left           = new CodePrimitiveExpression(Convert.ToString(value, NumberFormatInfo.InvariantInfo));
                expression2    = new CodeTypeOfExpression(type.FullName);
                argumentArray  = new CodeAttributeArgument[] { new CodeAttributeArgument(expression2), new CodeAttributeArgument(left) };
                initExpression = new CodeCastExpression(type.FullName, new CodePrimitiveExpression(value));
            }
            else if (type == typeof(DateTime))
            {
                string   str;
                long     ticks;
                DateTime time = (DateTime)value;
                if (mapping.TypeDesc.FormatterName == "Date")
                {
                    str = XmlCustomFormatter.FromDate(time);
                    DateTime time2 = new DateTime(time.Year, time.Month, time.Day);
                    ticks = time2.Ticks;
                }
                else if (mapping.TypeDesc.FormatterName == "Time")
                {
                    str   = XmlCustomFormatter.FromDateTime(time);
                    ticks = time.Ticks;
                }
                else
                {
                    str   = XmlCustomFormatter.FromDateTime(time);
                    ticks = time.Ticks;
                }
                left           = new CodePrimitiveExpression(str);
                expression2    = new CodeTypeOfExpression(type.FullName);
                argumentArray  = new CodeAttributeArgument[] { new CodeAttributeArgument(expression2), new CodeAttributeArgument(left) };
                initExpression = new CodeObjectCreateExpression(new CodeTypeReference(typeof(DateTime)), new CodeExpression[] { new CodePrimitiveExpression(ticks) });
            }
            else if (type == typeof(Guid))
            {
                left           = new CodePrimitiveExpression(Convert.ToString(value, NumberFormatInfo.InvariantInfo));
                expression2    = new CodeTypeOfExpression(type.FullName);
                argumentArray  = new CodeAttributeArgument[] { new CodeAttributeArgument(expression2), new CodeAttributeArgument(left) };
                initExpression = new CodeObjectCreateExpression(new CodeTypeReference(typeof(Guid)), new CodeExpression[] { left });
            }
            if ((mapping.TypeDesc.FullName != type.ToString()) && !(mapping is EnumMapping))
            {
                initExpression = new CodeCastExpression(mapping.TypeDesc.FullName, initExpression);
            }
            return(argumentArray);
        }