Language Integrated Query (LINQ) is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages.

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3
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2answers
97 views

Permutations in C#

I have a program that will get all possible permutations of a certain equation: A + 13 * B / C + D + 12 * E - F - 11 + G * H / I - 10 == 66 Where A, B....I is a value 1-9, and where each digit ...
3
votes
1answer
69 views

Extracting opening and closing times for each day of the week

I have these two methods: ...
0
votes
1answer
47 views

Repetitive code for a projected field in a lambda

I have a simple projection in my code. Taking away the majority of the fields which are not of interest, it looks like the following: ...
2
votes
3answers
88 views

Property Mapping with Reflection efficiency

I have an object that I am populating via mapping and lookup with Reflection: ...
11
votes
2answers
2k views

I had one job to do

The code I am working with: ...
1
vote
0answers
37 views

Query the context or resulting list

I was just getting some products using entity framework and was wondering which would be better to do when getting the results or if there is no difference Option 1 - Query the context directly ...
2
votes
2answers
165 views

Flatten a tree to a collection of nodes

I have implemented simple tree class as follows: ...
1
vote
0answers
53 views

LINQ to Entities query of tests for my classes, with many subqueries

This MVC4 controller method, which uses EF6, is taking a long time to run (over 2 seconds). I've added verbose comments for the purpose of this post only. ...
0
votes
1answer
103 views

Inserting employee records

There is nothing wrong, but is there any other nice way to re-write this program? ...
6
votes
1answer
130 views

Code Inspection: Procedure not used

Here is yet another piece of Rubberduck code, this time the nasty ProcedureNotUsedInspection class, whose role is to identify all procedures that are never called ...
2
votes
1answer
40 views

Extract incomplete weeks from a DateTime collection

The code below attempts to extract incomplete weeks from a List<DateTime>. For example, a list containing all the days in Jan 2015 would result in the 5th to ...
1
vote
1answer
98 views

Longest palindrome in a given string using LINQ

Problem:I need to write an algorithm that will return length of longest possible palindrome from a given string. So if the input is aabbbccdfg Program output should be 7. //-->[cabbbac] Can someone ...
5
votes
1answer
70 views

Grouping queries

I have a list of Options. From that list: First I want to get only Drink (the where clause). Then I want to group them by their SortOrder (range of 100). I can ...
2
votes
3answers
152 views

Compare collections

I have two Collections and want to compare them. ...
1
vote
1answer
80 views

Efficient use of LINQ - Indexing

I have a Class with a List of objects, and those objects contain a list which has lists to objects in the first class, and I'm trying to quickly index them. Simplified: ...
0
votes
1answer
62 views

Reduce nesting of for loops to increase efficiency [closed]

I need to optimize this code so it can execute faster, even if that means using more memory: ...
3
votes
1answer
100 views

Improving LINQ expression with inner method call and switch statement

I have the following class which returns an expression that then returns data. It seems a tad over complicated and I'm pretty sure LINQ has something to offer that makes my life much easier. But I ...
1
vote
1answer
76 views

LINQ grouping and sum

I have 4 properties which values I generate using LINQ: ...
5
votes
2answers
111 views

Using Linq syntax, how can I remove the select n+1 issue in this method?

I have the following code in a validation module. It works the way I want it to, but it has an obvious select n+1 problem. I would like to refactor this code to make a single call to the db to perform ...
0
votes
1answer
70 views

Remove particular element from an array and return indices of other elements

I'd like to get the indices of elements of an array with particular element. Is it okay or, or how can I make it even better? ...
1
vote
2answers
304 views

Calculate Total of Items in List

I would like to convert the following procedure to use Linq, but I'm not sure how to accomplish it, ForEach or Sum? ...
1
vote
1answer
76 views

Performance shifting for SQL Database and Linq memory grouping

I am messing around with shifting between stored procedures and business layer EF getting data rapidly then processing in memory. This works and on a static data range of 3 months I get execution ...
3
votes
2answers
98 views

Flatten Hierarchical Data with LINQ

I have a model with a hierarchical structure like this: ...
2
votes
1answer
87 views

C# sitemap crawler

Basically my code piece is a sitemap crawler - it opens sitemap, that contains sub-sitemap listings from - to a datespan. It opens sub-sitemap and gets all the URLs (most of them are seourl's, but not ...
6
votes
4answers
2k views

Using LINQ or Lambda instead of nested and multiple foreach statements

I want to use a better syntax than nested foreach statements to overwrite the initial list with items from the second list. In the code below: I want to ...
10
votes
2answers
324 views

Get result from UI thread to non-UI thread when using await Task.Run

I have an application where I use Task to run an operation. During the operation, there can be a problem which will need some user interaction (continue or not). I ...
1
vote
1answer
85 views

Optimizing my program by accessing data locally instead of a remote database

I have a database with 4 tables filled with millions of rows. I have my program run on several computers computing data and then returning it to the database. The huge bottleneck in my program design ...
3
votes
2answers
203 views

Getting column values from a datatable

Is there a way I can make the code compact and with fewer ifs? ...
8
votes
3answers
888 views

Get values between two dates

I have a search form where users can enter ValidFrom and ValidTo dates, There are three conditions: ...
3
votes
2answers
262 views

Uppercase the initial char of every string in a list

My problem is that I have a sequence, potentially infinite, of strings. Let's suppose it to be {"Mickey Mouse", "Bugs Bunny", "Winnie the Pooh"} I have to make ...
4
votes
2answers
315 views

Query results with many to many and some parameters using Entity Framework in a more efficiënt way

I've created a working query in Entity Framework and I'm curious if there's a better way to do this. Since there's a lot of field on my models, I will only publish the relevant ones here. My Models ...
15
votes
5answers
2k views

Linq me a FizzBuzz

I got this requirement recently: Write some code that prints out the following for a contiguous range of numbers: the number 'fizz' for numbers that are multiples of 3 'buzz' for numbers ...
2
votes
2answers
204 views

Timeouts when calculating stock ratings using LINQ

I'm getting a lot of timeouts with the following code and I'm running this method around 10,000 times so I need to figure out how I can optimize this so the timeouts will stop. I am getting timeout ...
3
votes
3answers
120 views

LINQ foreach - error handling and general improvement

I'm looking for two kinds of feedback: Is there a better way of doing what I'm attempting to do? Any obvious weaknesses that could potentially cause problems? The code in question (I've broken it ...
10
votes
3answers
662 views

Read/write to XML using LINQ

This will compile, but I'm thinking that this implementation of read/write is very hard coded and would not be easily adapted to larger situations where large XML documents are being processed or if ...
2
votes
2answers
190 views

Divide certain distinct row values into separate columns

This might be difficult for me to describe clearly but I will try anyway. Also note that this is entirely speculative; it might not even be able to run any faster (that is why I am asking). This is ...
5
votes
3answers
149 views

Code redundancy issue while feeding dropdownlists

I have a dashboard to manage a learning center system. There are scenarios like admin create learning center and define a classroom in it and then assign some courses in it and assign students to ...
14
votes
9answers
683 views

How can I refactor to avoid repetition finding the index of strings in a list?

I have a list of strings where I want to find the index of a first- and second-choice video compressor. Logic: If the first choice is available, return its index. If not, and the second choice is ...
1
vote
1answer
83 views

Simplification LINQ query and other code

I need to simplify the below code as well LINQ query: ...
1
vote
2answers
1k views

Split a list into equal parts that using LINQ in a way that has good performance

So I have a method that looks like this: ...
5
votes
2answers
186 views

Best way to get the list of XML files

I'm a newbie in the use of LinqToXml and I wonder if I can improve this snippet. ...
3
votes
3answers
357 views

WorkGroup Data Service with JSON / Web based API

I'm wondering if this code can be made more clear and fluent: ...
3
votes
2answers
148 views

Sorting by patients' name or birth

Is there a way to write this simpler? ...
-1
votes
2answers
130 views

Sorting array with respect to two properties

I'm sorting with respect to Width and Length. However, Width has the significance ...
5
votes
1answer
643 views

Sudoku Solver - Recursive Solve

Any ideas on making my code a bit more clean and efficient? Any criticism is appreciated. I don't like that I'm calling my lengthy DeepCopy method so many times, ...
3
votes
1answer
71 views

Parent with N-Childs where each child can have N-Childs

I know my question sounds strange but I have a situation in which I have Parent Data which can have 'N' Childs and each child can further have N-Childs and so on. So its Like. Parent a. Child ...
2
votes
2answers
268 views

Linq C# pulling from table row into input fields

Today is the first time I've used Linq, so I wanted to get a code review on this and make sure I'm going about it correctly. I'm filling text boxes and dropdown lists from a table row. ...
0
votes
1answer
119 views

Approximate integral in one line of code

This is what I came up with: Version 1: ...
1
vote
1answer
101 views

LINQ method to create objects of different types

I have the following code inside a method: ...
5
votes
3answers
94 views

Summing some datum for requests in each domain that fall in a date range

I have a LINQ query which works fine. I am however very interested to understand if this can be written in a more optimum way... ...