Questions tagged [.net]

.NET is a software framework supporting a multi-language paradigm and supporting language interoperability. .NET applications are executed in a virtual machine (CLR) which provides a few important services: security, memory management and exception handling.

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Simplify LoadLibrary/GetProcAddress helper for dynamic parallel DLL instantiation

Code is meant to be used in Windows .NET (tested with dotnet5.0) to dynamically load C library and return delegate of given function Code lower is result of my attempt to rewrite the ...
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2answers
65 views

Simple MemoryCache implementation for thread safe caching

After much prompting from this post I wanted to build a simple, in-memory, thread-safe cache. The only caveat (as far as I was originally concerned) was the need for two different absolute expiration ...
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2answers
113 views
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Implement IDisposable correctly using object composition principle

Is it possible to implement IDisposable pattern correctly while using object composition principle to promote code-reuse, reduce code duplication and hide verbose &...
3
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1answer
95 views

Hangman game with only one word

This is a hangman game. The only word is 'word' and I am not planning on changing this since I am not going to publish this game or anything. If there is any unnecessary/bad code I need to get rid of, ...
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2answers
194 views

Using multithreading to send multiple emails

I'm trying to send any number of emails in the shortest amount of time using .NET 5.0? I've been playing with something like the following but I am not sure if it is optimal or even correct as there ...
2
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1answer
73 views

A simple C# script that exploits PHP command injections

Back in 2016, I wrote a simple C# script that exploits a generic command injection vulnerability on PHP webapps, just for the sake of demonstrating that exploits can be written in .NET languages (due ...
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0answers
89 views

C# User class using SqlServer Database

I am creating my first business application. Unfortunately, I do not have anyone experienced in .NET or c# to review my code, and this is my first time not only using SQL, but also creating code in a ...
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0answers
9 views

Data optionally observable

I have a controller whose role is to persist some data into an external resource (could be a file, database, or anything else). This class takes generic objects, which may implement ...
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2answers
133 views

Possible speed improvements for a Sudoku board validation algorithm?

I tested this algorithm on 9x9 boards and on average, if the board passed to the function is a (valid) solution, it takes 0.13-0.14 seconds for 1 million executions on my machine. I ran my code in ...
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1answer
83 views

A versatile deck of playing cards. Standard 52-card deck and more

I have seen many posts regarding a standard 52-card deck of playing cards. I recently was composing an answer to one such post when I realized my answer should be its own post since (A) the answer ...
4
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1answer
68 views

ForEachAsyncSemaphore asynchronously processing tasks but enable fast fail

I know this has been done many times before, but this is my existing code taken from a sample I found to async process a list of tasks. I've seen Task.Run in use before in many examples, but I'm ...
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0answers
66 views

How to make this algorithm faster. Calculates and searches through large arrays

Ive got this algoritm thats "complex". The comments in code give examples of how large the various data types could be. My cpu usage is less than 10% when running this and ram usage is good. ...
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3answers
69 views

How to refactor a method with many prameters that sets a bit array

I've written a method that is going to set a bit array by passing bool parameters to be able send correct command ...
2
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1answer
45 views

String formatting

My requirement is to format the input values to a particular format as "##.###/##.###" Example - My input value can have alphabets, alphanumeric, numeric Expired -- > if alphabet, output ...
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1answer
39 views

Better way to keep a list of items from a Http Request?

I have a simple web api where each request "item" is stored in a list and thus a list is built without creating a new list per request. I have achieved this via dependency injection , but I ...
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0answers
99 views

DataGridView Undo/Redo Manager in C#

While answering this code review question, I proposed a solution with List<DataTable>. I am trying to encapsulate this data structure into a "...
2
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2answers
163 views

.Net core string symmetric encryption

I need to store sensitive strings in DB, so decided to encrypt it in a DB and decrypt it at the application layer. And noticed that it is not so easy to find ready to use an example. Please check my ...
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1answer
43 views

Downloading multiple log files

This code succeeds in downloading log text files from multiple URLs. Can this be made more efficient? ...
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0answers
89 views

How to make a good session handling with NHibernate?

here I leave my code for a repository pattern with NHibernate and Autofac. I would like to receive some feedback about it. Especially about the session handling with NHibernate. By now I don't like ...
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2answers
130 views

What would be the idiomatic F# way to write optional parameters?

In the context of a library to generate random credit card, it would be nice to let the user the possibility to set some optional options on some cards. Lets take Visa. Two lengths are available: 13 ...
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1answer
32 views

Remove and add connection string

I want to remove a connection string that may already have been set in a different config file and then set it again. Say my application has a Web.config file and a Web.Debug.config file then I can ...
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0answers
48 views

.net core console app read from external API and write into a database

I have a .net core console app that gets some data from an external API and inserts it into a SQL database table. It is working as expected but I wonder if you guys have any suggestions to make it ...
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1answer
61 views

Byte array comparison - efficiency

I have a TCP Listener with NetworkStream that reads 530 bytes from the Client once a second. Within the TCP Listener ...
2
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1answer
80 views

Is repository pattern violated while using IQueryable outside of it?

I am writting an API backend application using .NET Core and Visual Studio. Here is the solution structure: [ProjectName] - Solution ...
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0answers
72 views

Is there a way to optimize this graphics/bitmap drawing code in C#?

I am not doing anything fancy so not sure if there are any tricks to make it faster. It's a progress bar where I draw some numeric text on top. I only draw 1 pixel height image and then resize it. But ...
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1answer
117 views

Eliminating repetitions of subsequent items in a list

I would like to convert a list A A = {1, 12, 3, 3, 3, 8, 5, 5 } into list B ...
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1answer
85 views

Big Sorting - Performant Sorting

Consider an array of numeric strings where each string is a positive whole number. Sort the array's string elements in ascending order of their numeric values, and return the sorted array. Return: ...
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1answer
55 views

How to make this code follow Solid Principle C# [closed]

Currently I have this code: ...
4
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1answer
90 views

Minimum number of copies of an application a company needs to purchase

Some applications from vendors are allowed to be installed on multiple computers per user with specific restrictions. In our scenario, each copy of the application (ID 374) allows the user to install ...
2
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1answer
67 views

Giving an alternative Async method to a service [closed]

I have an interface, implemented by a service, that I inject here and there in my codebase. I would like to give the opportunity to use either the normal method or its async equivalent. ...
2
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0answers
162 views

Simple Sqlite-driven WinForms app in C# 7.0 - database interaction code

Description This is a simple "demo" app designed to help gain familiarity with interacting with an Sqlite database from C#, particularly storing images as blobs. The database has a single ...
2
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1answer
108 views

Reviewing Basic API

I'm learning ASP.NET and I've created a few simple APIs, so I can consider myself maybe an intermediate beginner. I've decided to create a tutorial serving two purposes: to solidify what I've learned ...
5
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2answers
293 views

C# Logical and Math expression parser

I needed a simple parser that could do both logical and math operations expressed in a string, as well as being able to use variables stored in json. None of what I found online seemed to do all of ...
3
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0answers
119 views

Console Password Manager in C# in 370 lines

This is a console password manager in C# script. It has 370 lines of code, from shebang to the last }. Are there any ways to make it even smaller without inlining ...
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0answers
24 views

Preventing the user from entering the same categories [closed]

I'm new to MVC and EF so this may be a really simple question, but what is the best way to prevent the user from trying to enter duplicate records? I have a table called Category with two columns Id ...
2
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1answer
57 views

Determine dependency injection type at runtime from config

I have a .NET application with a .config file that has content like this: ...
2
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3answers
131 views

C# Update account based on user order data. Nested if-else optimization with almost similar values

The method works, but I would like to know if there is any way to make it more readable, optimized? I have user data (i want to import/update it). Accounts is finded by user data. ======== User order ...
4
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1answer
110 views

C# KeyNotFoundException with more information

Preliminary rant: System.Collections.Generic.KeyNotFoundException : The given key was not present in the dictionary. Oh. My. So I finally got fed up with how ...
3
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1answer
65 views

Different versions of the Operate method

I have code that basically is the same, but depending on the number of arguments you provide (up to 5), it will operate with them in a very repetitive way. I have the feeling that this can be ...
3
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2answers
234 views

Build byte array from multiple different types of data for sending over a network

The following codes purpose is to generate an array of bytes that represents some user defined data. This array of bytes will later be used for sending over a network. ...
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2answers
73 views

How can I refactor a function to be inline? [closed]

I'm refactoring functions trying to do more of a in-line aproach. ...
3
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2answers
79 views

Exporting objects in various formats while reporting progress

Description A WinForms application has a function to export objects of the following type, in various formats: ...
2
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0answers
23 views

Applying OOP to refactor my Windows Forms APP [closed]

Could you please give me some direction about how I could refactor my code? As I add functionalities to my Budget App the class is getting bigger and I'm sure I could start looking at separating ...
1
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0answers
90 views

Code refactor - eliminate generic interface and object methods

I'm building a method that tries to detect whether given information about an object's property to retrieve, a constraint operator and some data to compare it against, whether the result is true or ...
7
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3answers
2k views

C# Am I using proper SOLID principles?

I am currently practising using the SOLID principles in C#/.NET I have made a little example, but i am not sure if i have followed it correct. Its a simple example where i have an API controller that ...
3
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1answer
749 views

Undirected graph data structure in C#

Description A class representing an undirected graph. At the moment, it supports integer values as vertices. An example of the type of graph represented is shown in the following diagram: It is ...
3
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2answers
132 views

Refactor multiple if-else conditions when condition is a minor change

I'm new programmer and I'm working on Xamarin MVVM app and I have a pin view like So, basically I have numbers from 0-9 if you pick one number its visible then if ...
7
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1answer
329 views

Is Lock necessary to make operation thread safe for this scenario

I have the following method that is responsible for retrieving an Item from the database. There will be multiple threads instantiating this class, so I want to make ...
12
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2answers
653 views

C# - name separation & last name in upper to Camel

I had an xls file with lots of full names in the following form at work: ...
3
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2answers
92 views

Simple Password Generator Feedback

This is my first major project in F#, looking for any critique on how I can make it more standard or more concise. Some things I feel like I could have done better are the command flag parsing and the ...

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