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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Copy object without reference using reflection
Recently I was in need of a method to copy an object and pass it to a method which alters the data. Since a class is passed by reference this would alter the class in the caller which I don't want.
So,...
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Readlines abstraction for Golang
I've just started learning Golang and was solving some problems which required me to read lines of text from a file. I decided to abstract away the reading part so that I can use Go's ...
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Mapping various input values to a data accumulation class
This function takes inputs from multiple different controls on a form, and maps them to values in a data accumulation class. This code was written specifically to keep logic, data, and display ...
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Simple Java IoC container for dependency injection
I have come up with a quick and simple IoC container to enable minimal dependency injection support in one of my Java projects.
The container supports services with:
A transient lifetime, meaning, a ...
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Entity Component System (ECS) in Java
While trying to write a game engine, I came up with this ECS / Component Based Architecture for its physics and drawing logic. I want to get some feedback on its architecture. I am using reflection ...
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Best way to get an arbitrary property for a C# class?
I have close to a hundred classes where I need to get arbitrary properties from them at runtime. The calling class knows which properties it wants at run time, but not at compile time. Looking for ...
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Low Level VBA Hacking - making Private functions Public
NEW: Download demo files
Not sure what to title this - essentially, inspired by RubberDuck's unit test engine, I've created a way to call private methods of standard modules in VBA. It also lets you ...
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Change arbitrary arguments of function based on their names with a decorator
I ran across an issue that proved to be more complicated than I thought: Changing an arbitrary argument of a function purely based upon its name in Python - possibly via a decorator. I tried to ...
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Setting all class members to null to destroy strong references
At work we are using Xamarin.iOS for our apps. We frequently have to fight it's disadvantages, namely it's memory leak issues where strong cyclic references keep objects alive and prevent them from ...
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Search code that performs in-memory search
This is the code I came across in our repository. This performs search in-memory and is invoked on service layer code.
In our front end operators like EQUAL_TO and ...
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How to save/get different type of data with less duplicated code
description:
I'm using thrift to save and get data by filter.
The data have many types, and the types may increase in the future. So I use ...
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Exists Method Implementation for Multidimensional Array in C#
To determine whether the specified array contains specific element or not, Array.Exists can be used if the given array is one dimensional. I am attempting to implement ...
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Class showing a format similar to var_dump v1.0.5
First of all I must thank for the help given in the previous post:
Class showing a format similar to var_dump RC5 Version
I have it deployed in a early versio v1.0.5: https://github.com/arcanisgk/BOH-...
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Increment struct value using reflection
The main idea is, I have a struct and I will get a struct field as a string from another function, which I shall increment its value by 1.
Below is the code I used and I think it is memory consuming.
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In-proc event dispatching through IoC container
Here is the sender and handler interfaces:
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Performance impact of using reflection instead of an "Options" class
I am trying to refactor a service by providing some options on what to bring back. I can't decide what is best way to go between the below
A. Use a class for the options
Create a new class for the ...
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Yet another reflection library
Tried to do my own implementation of reflection(introspection) for using in my next projects.
Is it optimized at compile time? If no, how can I improve it?
This macro is good interface for adapting ...
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C# Reflection-based CSV Parser
I've been trying to make a C# version of my Java CSV Parser using C# specific idioms.
Here is the full code:
...
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Java Reflection-based CSV Parser
I'm an experienced Java developer, however I don't have experience with reflection or Annotation classes. For fun, I tried to develop a CSV Reader class which can parse each row into a particular type....
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Find all classes A that implement B<T> and aggregate both A and T to build a map out of them
In my project I have the following base interfaces used through the application:
interface Node { /* ... */ }
interface NodeService<T> { /* ... */ }
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Pass class property as parameter to extension method
I have the following class structure:
MyAttribute.cs
...
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Feedback on automatic form filling with reflection
Context:
I need to fill a handful of .docx templates with answers that come from form.responses, which is a dynamic object that comes from a JSON and can have different properties that vary according ...
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To convert all the class properties to IDictionary<string, dynamic>
I have the requirement to return the result of my ViewModel as a Dictionary of KeyValue pairs. My view model comprises of multiple classes and can have null values in properties. I need to return only ...
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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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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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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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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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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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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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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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PHP function to obtain model_name from Namespace\To\ModelName
Would there be a more clear/efficient way to write
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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.
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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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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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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)...
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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 ...
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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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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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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 ...
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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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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.
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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 ...
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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'...
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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!
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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 ...
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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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Using Reflection to call multiple methods and cast various classes [closed]
I have written the following Reflection code:
...
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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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