Questions tagged [reflection]

Reflection is the process by which a program can observe and modify its own structure and behavior at runtime.

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0answers
68 views

Generics and aggregated evaluation of validation rules

I have a custom system for data validation; it handles anything from method parameters, return values, objects, etc. The core of this system is IValidationRule and ...
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Library/API: simple springboot / jdbc query builder and ORM

I have been using and developing a simple ORM and query builder library that I have found useful in it's practical application. I am pretty sure there are improvements to be made, and I welcome any ...
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4answers
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Instantiating a C++ class based on an enum value

I have a bit of code duplication and trying to figure a better way to reduce it. I'm looking for any suggestions. If this was in Java I could easily use reflection. The code posted is a basic ...
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0answers
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Factory class that uses reflection to instantiate objects by class name

In this SO post Dynamically choose class from string Alexander Platonov creates a Function on the fly and then uses Application.Run() to instantiate an Object by ...
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2answers
242 views

Immutable builder and updater

There aren't enough questions about creating immutable objects... so why not try it again with another approach. This time, it's a builder that maps properties to constructor parameters. Properties ...
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3answers
97 views

Simple middleware pipeline builder (similar to asp.net-core)

I created a simple middleware pipeline builder that I want to use for my frameworks. It is similar to how ASP.NET-Core middleware works and uses the same conventions: A public constructor with a ...
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5answers
12k views

Convert a custom object to a query string

I wrote an extension method that takes a custom object and converts its properties to a query string for use in a URL. You can specify what properties you want included by using a ...
10
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3answers
3k views

Converting between data and presentation types

Below is how I'm solving the problem of converting between data and presentation types, I'd like to know if that's a good way to go about it, and if not, what would be a better way to go about it. I ...
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0answers
23 views

Inherit docstrings from specified parent

I was recently working on some python where I was working with multiple inheritance and mixins and stuff like that, and I wanted to inherit docstrings for specific functions, from specific parents (...
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2answers
2k views

Test all properties with single test function

In writing unit tests for c# functions, there is a good case made for testing properties. In testing those properties, I felt there should be a few goals. Provide a wide range of inputs Test ...
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2answers
472 views

Python deep get

I'm implementing deep_get functionality to look inside arbitrarily nested Python 2.7 objects. Primarily for further logging. This turned out to have surprising ...
4
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2answers
105 views

Registering Named services and resolving them by T

Problem statement I have an application that needs to get files from various sources (disk, embedded, http, ftp, ...) so I use a common API for them: ...
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5answers
84 views

PHP function to obtain model_name from Namespace\To\ModelName

Would there be a more clear/efficient way to write ...
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2answers
492 views

Reducing using/foreach/using nesting with a helper extension

Problem statement There are sometimes foreach scenarios that require deep nesting due to multiple disposable objects involved that look like this: ...
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1answer
58 views

Assigning test-data parameters by name

When creating data-driven tests with xUnit we can use the MemberDataAttribute to get the data from a member of this or other ...
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2answers
23k views

Mapping ExpandoObject to another object type

I am working on a helper method that maps properties from an ExpandoObject to a user supplied object and was wondering if the code could be cleaned up or made any ...
6
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3answers
335 views

Calculating time windows for entities

I have made some code that operates on multiple entities and creates 'time windows' for them. Basically, the entities will contain states, usually in boolean or int. They will be timestamped and in ...
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1answer
69 views

Class to fill model objects with data from the database

This is a helper class that helps fill models with data obtained from the database. ...
5
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2answers
411 views

Fetch and print all properties of an object graph as string

Below I have setup an extension method that takes any object, cycles through its properties, and prints each out to a Console window in the format Name: Value. ...
6
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2answers
26k views

Find all collection properties of an object and get their values

I have a chunk of code that get's all of the ICollection properties of the passed in object and then takes all of their values and adds them to another ...
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2answers
809 views

ComplexProperties with Reflections

I have used reflection for divide the complex property. For example, if I bind A.B[0], CustomerName means CustomerName is returned. Can anyone help to reduce the ...
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1answer
81 views

Dynamic setting names based on properties

In one of my frameworks that I use with many tools I have an ExpressionVisitor whose job is to resolve the exact property, it's declaring type and instance. I ...
6
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1answer
151 views

Enumerate all members and types with specific attributes

I have a use-case where I need to retrieve all members with specific attributes in the class and interface hierarchy - I usually need the first match and apply its rules to child members. The built-in ...
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1answer
37k views

Method that returns description attribute of enum value

I have the following method in .NET Core that returns the description attribute of an enum value. I think this code can be more elegant. I'd appreciate some ...
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1answer
53 views

Populating dropdown lists, using SQL vs. using expression trees and reflection

I'm working with a large enterprise SQL Server database with dozens of tables that are used mainly as lookups to populate dropdown lists, etc. These tables all follow the convention of having (table)...
1
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1answer
43 views

Update any controls' Text for the specified language [closed]

I would like to optimize the below code The only difference is the datatypes RadioButton, Label, and Button. Outside the method I have an loop that iterates over all the controls in the aspx-page. I ...
6
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3answers
4k views

Generic extension method that will attempt to parse a string and return it's value or default(T)

So I got sick of several things about the way TryParse works. I implemented a generic ParseOrDefault function using reflection. It appears to work as expected, but I'm not fool enough to say my code ...
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6answers
92k views

Generic Null/Empty check for each property of a class

I have created a method to check for null/empty values of class properties and if any null property is found I'm stopping the checking process and returning the result as true. I've used a solution ...
3
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1answer
73 views

Settings class implementation

I have a settings.txt file with the following format: ...
3
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1answer
77 views

Exploring code objects

The first version of my solution was wrong (the usage of compile() function), for details see Stack Overflow. The solution has been fixed and now it works ...
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4answers
4k views

Using reflection in a test to check if a private variable is really null after a function, is this okay?

I am using reflection to check if a private variable is set to null after the logout function. This is needed because the getUser function will always attempt to set and return an user if no user is ...
11
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3answers
108 views

Simple generic auto __repr__

Preface At some point I was tired of writing & supporting __repr__ methods, so I've decided to write it once and reuse everywhere in my classes. Since I'm ...
3
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0answers
72 views

Generic object-to-XML mapper

This code is part of a larger mapping library I'm working on to address some business concerns of transforming data. I was inspired by mapstruct in Java, but opted for users to annotate / add ...
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3answers
273 views

Determine the class hierarchy of a class

My only concern with the following class is the line hierarchy.trimToSize() in determineHierarchy, because it is not necessary ...
3
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1answer
35 views

Snippet to get all local classes from a module

I'm working on a project which due to the complexity of the business logic has had to pull out some classes to do computation related to some values in a database. To link the code and database, both ...
4
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1answer
72 views

Immutable type updater using a special constructor

I wanted to update some properties of my UriString but since this type is immutable, it wouldn't work. Actually, I just wanted to update the Path property but I don'...
2
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1answer
65 views

Reflection optimization for export CSV on large scale

So, I'm building export/import CSV helper. I have some performance issues in the code below. it takes me to parse CSV of 25,000 rows at 7 seconds. If someone can help, it will be awesome! ...
5
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1answer
608 views

Making TypeNameHandling in json.net more convenient

Handling abstract types in json.net can be sometimes challenging because it requires a very long and complex syntax like: ...
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3answers
60 views

Finding the name of a given constant using reflection

The code below comes from the Arm_const class of my Android disassembler project: ...
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0answers
57 views

Dependency resolver in PHP

I wrote a simple Dependency Resolver in PHP that I'm hoping to get some input on. The main problem that gave me some trouble was when it had to resolve typed arguments ( like type hinting a ...
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1answer
57 views
0
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1answer
187 views

Kotlin reflection to generate one class from class similar with similar properties

This code is intended to generate a class (domain) from a class with class with similar/identical properties (api). Motivation is to speed development time when using clean architecture. ...
7
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4answers
7k views

Get nested type name without namespace

Suppose I have a nested class structure like this: ...
2
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1answer
88 views

Event based input files management system

I'm currently making a system that can accept different sorts of files and some classes are interested only in specific types of files, while some don't discriminate at all. Note Type of file isn't ...
1
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1answer
60 views

Executing a function's flow

My __main__.py file has a function's flow, based on methods of each class instance, which each one has its own methods and attributes, like this: ...
3
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1answer
36 views

Order loaded modules by amount of functions

I am trying to solve some exercises from the "Programming Erlang" book. One of them is "Write a function to determine which module exports the most functions" This is my solution: ...
3
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1answer
190 views

CSV Reader from scratch

I am new to Java and not quite familiar with its design patterns. I have tried to implement a CSV-File reader from scratch. The CSVFile constructor accepts the path to the file and a class which ...
3
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1answer
1k views

Use reflection to check for class methods with a custom attribute

This code is within a ViewModelBase class. I have a custom attribute defined that is meant to trigger methods when a property is changed. The following runs as the ViewModel is being constructed. ...
6
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1answer
524 views

Fake duck typing with dynamic

There are sometimes situations where you have a couple of related classes with static fields or properties but you cannot access them via ...
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2answers
541 views

Populate null fields in an object through reflection

I have recently implemented this utility class for going through an instance's member fields recursively and assigning them default values if they are null. Here is the implementation in the ...