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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Vending Machine
After doing a lot of reading and practicing, I've come up with a simple program that implements multiple OOP techniques, principles and several design patterns such as Observers, Factories and ...
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Count duplicate List<int>
Count duplicate List<int> in List<List<int>>.
A duplicate is not order-dependent. { 1, 2, 3 } is a duplicate ...
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Tuning Excel calculation engine which uses MS Excel interop
I am currently building an Excel calculation engine. Its purpose is basically to wrap the calculation logic of an Excel workbook in order to use the logic from a C# library.
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Combining List<>.ForEach and List<>.Zip
I have three lists, and I need to operate on the ith element of each list simultaneously.
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Removing accents from certain characters
I have a method that I am using to remove accents from certain characters. The problem is the massive slew of characters I am expected to work with. I have to, basically, remove accents from all Latin ...
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Somewhat esoteric if statement in a paginated feed
I am working on the home page of a website that will have a paginated feed (much like a blog's home page).
One of the requirements is that when a user navigates to a non-existent page, he or she will ...
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Optimizing special cases of modulo
I have a use case where improvements to the speed of calculating modulo for 64 bit integer dividends makes a significant difference in overall processing time.
The divisor isn't known statically - it ...
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Serializing objects to delimited files
For a new project I'm going to need to be able to serialize random types to TSV or CSV files, so I write a class which can be used to serialize any object to a TSV, CSV or any other _SV file you can ...
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Is there a better way to search directories for a file or files?
Edit:
The purpose of this method is to search a specific directory for a given file type, ex. (*.txt, *.pdb, *.exe") then move the file(s) to a given destination directory and delete the original ...
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Safe Dispose of Timer
I am currently refactoring a larger solution where the compiler gave multiple warnings about disposing the used System.Timers.Timer instances. The timers are ...
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Go through every pixel of an image and then dispose of it
I'm a little confused as to whether implementing the Dispose method serves a purpose in this code. It never gets referenced by any other class in my project, so ...
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Recursive database actions
I am been using a code pattern for recursive database actions in my applications.
I create two class objects of a database table, singular one (e.g Agent) for holding single record with all fields ...
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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 ...
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ASP.NET Core 3.1 AddHttpClient call that includes a call to the database
So, I have an ASP.NET Core 3.1 web site that makes occasional calls to a vendor's RESTful API. I use the HttpClient class to perform these calls.
Currently, the ...
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Generic Dictionary Equality Comparer
I created the below comparer to allow me to use a generic dictionary as a key to another generic dictionary.
My GetHashCode implementation creates a hash based on ...
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Finding MinMax values and returning a tuple as a result
I was coding some tooling stuff when I started to ponder whether the best return type for a Range / MinMax method applied on a IEnumerable method.
I am using the value the C# 7 Tuples like below, but ...
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CRUD commands to SQL database
I have a large application that focuses on using dependency injection. I've made a small (as I possibly could) piece of sample code to make this question more manageable. Essentially, I have a lot of ...
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Is there a better way to call the same method with different parameters?
I have a method(C#) which takes an XmlNodeList and a String and saves the xml data into a database. That code isn't the problem (at least for the moment), but because I have multiple XmlNodeLists, ...
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ThreadSafeObservableCollection of (T)
The idea here is to implement a simple, threadsafe, observable collection that clients can bind to, whilst background threads can update. Changes in the contained items raise the ...
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Memory test in windows forms
I've made a memory test game in windows forms, where you need to find and match 2 cards with the same images.
It has 3 difficulties :
Easy - 4 different pairs of cards, no time limit, no mistakes ...
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Sum-based sliding rate limiting with Redis and Lua
As I'm new to Redis, I would like to get a review / improvement suggestions from Redis / Lua experts on the following problem and the solution I have found so far.
Problem
The context is: an e-...
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Setting the value of properties via reflection
I am working on an application in which I have to parse an XML file. Nodes of the XML file corresponds to an object. I have to populate the properties of the objects at run time. The code below ...
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Fastest De-/Serialise struct in .Net
I wrote this code to De- and serialise structures afap using IL generation (comments describes C# analogue). What can be improved here?
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String tokenizer via UDF
I am trying to implement strings tokenizer in Excel via UDF using C# and Excel-Dna. Personally I found the mIRC's function $gettok pretty useful due to the lack of ...
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Create path to file under 64-bit %programfiles% from 32-bit process
I have a process that runs as 32-bits regardless of the architecture. In it, I want to be able to spawn a process from the 64-bit program files menu (e.g. ...
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Implementing IDisposable correctly to return TCP connection back to pool
I'm trying to implement TCP connection pooling and return a connection back to the pool using IDisposable. I'm wondering if my implementation is correct. It seems ...
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HKDF Implementation in C#
Based on my prior question about HKDF here https://crypto.stackexchange.com/questions/43933/use-of-pbkdf2-when-no-access-to-hkdf and the responses I received I decided to go ahead an implement HKDF ...
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A generic IEnumerator to enumerate COM collections
As I wrapped the VBIDE API, I encountered a number of "collection types" (Windows, CodePanes, ...
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Async TCP client/server
I'm working on a simple async TCP client server application, i'd like my network code to be reviewed. I really feel that I'm doing something wrong, especially in receiving code.
Interface for client:
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Implementing an IRC Bot
This is a (fairly) simple IRC bot. The whole idea of it was similar to Duga, except that it will post to an IRC server instead.
The bot takes messages from a SQL table and posts them in the IRC ...
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Replacement string Base64 (and a Base32) conversion [closed]
This provides (my own) implementation of ToBase64String and FromBase64String (since the .NET implementations suck), and a ...
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Optimization of comparing two collections and get the changes
I use the following code to get the changes between two collections. Objects are "joined" using a primary key. Any tips on performance issues or other optimizations appreciated.
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Making async SQL calls
I've written a class to make async SQL calls and it appears to work like a charm! But I'm a bit concerned about what it means to send a lot of queries to the server and then aborting them by throwing ...
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Code that uses reflection to validate arguments
I wrote an answer to this question on the Software Engineering SE site and was hoping to get it critiqued. (I'm told that it's acceptable to do so).
Essentially, this code uses reflection to check to ...
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Secure password hashing implementation
I'm implementing a password hashing method for a website. The code below is part of the User class.
Any pointers on what I could do better?
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AutoResetEventAsync, am I missing something?
So I wrote an asynchronous version of AutoResetEvent:
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Cached empty collections
I often need to return empty collections.
One of those days I wrote the following to return a cached instance:
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ASP.Net, C#, and alert/display messages
We have a hidden div in a master page. When we want to display a message, we send a function a message to display, and it turns that div from .Visible false to .Visible true, and fills the div with ...
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3-layer ASP.NET app - Need critique/advice
My current setup is a 3 layered application: UI > BLL > DAL. Each layer is set up as a separate project. The UI is an ASP.Net website and the BLL & DAL are Class Library projects.
I've shown some ...
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A super string cleaner
I need a method that clean up a string considering these few rules:
Remove or not Spaces
Remove or not Special Chars
Remove or not Numbers
Descaptalize or not the string (this is don't really needed ...
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MVVM: Am I doing it right?
I read a lot of articles recently concerning XAML, WPF, data binding and MVVM. I also watched some MVVM tutorials and downloaded some MVVM samples. I finally got my first MVVM sample to work, but ...
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Async distributed locking with StackExchange.Redis [closed]
I have been trying to write an analogy to this approach to distributed locking with two differences:
making it asynchronous
making it work with StackExchange.Redis rather than AppFabric Cache.
My ...
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Encryption and decryption on streams using AES CBC + HMAC SHA
The goal of the code below is to:
Support authenticated encryption using AES in the CBC mode and using HMAC SHA.
Support encryption and decryption of data of size larger than memory (potentially).
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Pin an array in memory and construct a Bitmap using that buffer
I'm using some resources in the code below to pin an array in memory and construct a Bitmap using that buffer. I'm not sure if I'm handling all of the resourced in ...
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Streaming a Pin functionally(ish)
Earlier today I wrote a question (Validating a StreamingPin) and I thought it was a good idea (apparently I was the only one who thought so, but whatever), so I proceeded further with it and developed ...
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Take N elements from List of Lists
I've come with a solution super tricky for a simple requirement. I think I could solve the problem using LinQ, but I'm not seeing it so clearly at all.
What's sure, I'm not comfortable with my code.
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Faster way of reading csv to grid
I have following in Windows Forms .NET 3.5
It works fine for csv with records less than 10,000 but is slower for records above 30,000.
Input csv file can can any records between 1 - 1,00,000 records ...
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