XSpect.Yacq.Expressions.YacqExpression.ConvertNumericType C# (CSharp) Method

        internal static Type ConvertNumericType(Type expressionType, Type expectedType)
        {
            var expectedType_ = Type.GetTypeCode(Nullable.GetUnderlyingType(expectedType) ?? expectedType);
            switch (Type.GetTypeCode(Nullable.GetUnderlyingType(expressionType) ?? expressionType))
            {
                case TypeCode.Char:
                    switch (expectedType_)
                    {
                        case TypeCode.Char:
                        case TypeCode.UInt16:
                        case TypeCode.Int32:
                        case TypeCode.UInt32:
                        case TypeCode.Int64:
                        case TypeCode.UInt64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.SByte:
                    switch (expectedType_)
                    {
                        case TypeCode.SByte:
                        case TypeCode.Int16:
                        case TypeCode.Int32:
                        case TypeCode.Int64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.Byte:
                    switch (expectedType_)
                    {
                        case TypeCode.Byte:
                        case TypeCode.Int16:
                        case TypeCode.UInt16:
                        case TypeCode.Int32:
                        case TypeCode.UInt32:
                        case TypeCode.Int64:
                        case TypeCode.UInt64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.Int16:
                    switch (expectedType_)
                    {
                        case TypeCode.Int16:
                        case TypeCode.Int32:
                        case TypeCode.Int64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.UInt16:
                    switch (expectedType_)
                    {
                        case TypeCode.UInt16:
                        case TypeCode.Int32:
                        case TypeCode.UInt32:
                        case TypeCode.Int64:
                        case TypeCode.UInt64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.Int32:
                    switch (expectedType_)
                    {
                        case TypeCode.Int32:
                        case TypeCode.Int64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.UInt32:
                    switch (expectedType_)
                    {
                        case TypeCode.UInt32:
                        case TypeCode.Int64:
                        case TypeCode.UInt64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.Int64:
                    switch (expectedType_)
                    {
                        case TypeCode.Int64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.UInt64:
                    switch (expectedType_)
                    {
                        case TypeCode.UInt64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.Single:
                    switch (expectedType_)
                    {
                        case TypeCode.Single:
                        case TypeCode.Double:
                            return expectedType;
                        default:
                            return null;
                    }
                case TypeCode.Double:
                    switch (expectedType_)
                    {
                        case TypeCode.Char:
                        case TypeCode.SByte:
                        case TypeCode.Byte:
                        case TypeCode.Int16:
                        case TypeCode.UInt16:
                        case TypeCode.Int32:
                        case TypeCode.UInt32:
                        case TypeCode.Int64:
                        case TypeCode.UInt64:
                        case TypeCode.Single:
                        case TypeCode.Double:
                        case TypeCode.Decimal:
                            return expectedType;
                        default:
                            return null;
                    }
                default:
                    return null;
            }
        }