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

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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 ...
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2answers
139 views

Flatten a tree to a collection of nodes

I have implemented simple tree class as follows: ...
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26 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. ...
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1answer
96 views

Inserting employee records

There is nothing wrong, but is there any other nice way to re-write this program? ...
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1answer
116 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 ...
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1answer
38 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 ...
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1answer
87 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 ...
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1answer
65 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 ...
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3answers
145 views

Compare collections

I have two Collections and want to compare them. ...
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1answer
75 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: ...
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1answer
59 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: ...
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0answers
74 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 ...
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1answer
67 views

LINQ grouping and sum

I have 4 properties which values I generate using LINQ: ...
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2answers
107 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 ...
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1answer
54 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? ...
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2answers
281 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? ...
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1answer
68 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 ...
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2answers
85 views

Flatten Hierarchical Data with LINQ

I have a model with a hierarchical structure like this: ...
2
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1answer
72 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 ...
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4answers
1k 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
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2answers
293 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 ...
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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 ...
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2answers
132 views

Getting column values from a datatable

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

Get values between two dates

I have a search form where users can enter ValidFrom and ValidTo dates, There are three conditions: ...
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2answers
206 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 ...
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2answers
229 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 ...
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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 ...
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2answers
184 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 ...
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3answers
110 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 ...
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3answers
477 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 ...
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2answers
172 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 ...
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3answers
145 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 ...
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9answers
676 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 ...
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1answer
79 views

Simplification LINQ query and other code

I need to simplify the below code as well LINQ query: ...
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2answers
760 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
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2answers
179 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
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3answers
307 views

WorkGroup Data Service with JSON / Web based API

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

Sorting by patients' name or birth

Is there a way to write this simpler? ...
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2answers
114 views

Sorting array with respect to two properties

I'm sorting with respect to Width and Length. However, Width has the significance ...
5
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1answer
607 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
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1answer
65 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 ...
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2answers
243 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. ...
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1answer
113 views

Approximate integral in one line of code

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

LINQ method to create objects of different types

I have the following code inside a method: ...
5
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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... ...
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2answers
391 views

Wait, is this… LINQ?

Context I'm working on a little project that consists in a series of Microsoft Excel add-ins (.xlam). The code being submitted for review here, is located in the ...
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2answers
169 views

Improving the performance of Linq based solution

Again, out of fun on saturday night, I decided to solve the following problem from CodeEval. The challenge is finding the index of the lowest unique number. ...
3
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1answer
325 views

Insert missing records in a list with LINQ

We have a table with periods, and other child tables with these periods and values for combinations of product + location. Based on selected periods, I would like to add any missing rows in the child ...
3
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1answer
197 views

Efficiency of nested LINQ foreach loops

I've been working on an older project with framework is 3.5 as the target. There is a new user control that displays a list of data from a web service. I hit the web service (Soap/XML) and deserialize ...
8
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3answers
367 views

Indentation on a long (ish) linq chain

I have some code that loops through directories named for years (e.g. /2011/, /2012/ etc) which each contain files whose names ...