Language INtegrated Query (LINQ) is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages.
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compare two List(T) via three or multiple properties using LINQ in C# [on hold]
I have a List(T) like this one:
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67 views
Storing user settings using LINQ to XML
I want to store some user settings into a file, so that the users get the same experience on all machines they're working on. The built-in user.config turned out to ...
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1answer
70 views
Commission calculation
I am trying to improve the performance of the current solution for calculating commission in a betting platform.
The following is the code currently used to solve the problem. The primary problem ...
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1answer
113 views
Performance comparision of SQL queries versus LINQ in Visual Studio 2012
I am new to VS 2012 and need to use it with SQL Server. I need to get data from a table in SQL Server 2012 with 500 rows and 15 columns and process the data in it and update another table. All this ...
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1answer
51 views
LINQ queries to fetch first and last name
I have these two queries and they work just fine. I use the values they retrieve to populate a title for a view in my application. It seems though that I should be able to accomplish this with one ...
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1answer
98 views
Inserting customer care database analysis detail records
I have written this linq-to-sql query to insert a bunch of customer care database analysis detail records:
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4
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3answers
127 views
Return IEnumerable<KeyValuePair> from a private method; use Dictionary or anon. type?
Is it okay to return IEnumerable<KeyValuePair<string, string>> from a private method instead of returning a read-only dictionary? This allows for ...
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1answer
54 views
Optimize LINQ search with custom fixed ranking
I have to perform on some collection and return ranking based on some logic
I wish to optimize this working code since I think it can be bettered (maybe using tasks?).
I need to search on ...
4
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1answer
92 views
Finding out which user has made the most progress
I have some code to accomplish the objective of finding out which user has made the most progress. Progress is measured in integer values, the higher the better. ...
2
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1answer
68 views
Get list of unique parents from childrens list
Parent has list of Children. I only have access to the list of children. I need to get list of unique parents from the List of ...
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2answers
57 views
Grab set of data from database that matches userid and return it to the view
I want to get the row of data that matches the user ID I have. Then I want to return that view to my view to be displayed in my textboxes for editing.
Here's the action that gets called when a get ...
3
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2answers
83 views
Linq to entities query for donor registrations [closed]
I'm using Linq-to-Entities for querying, and MVC.NET and C# for coding. I'm trying to generate monthly donor registry report which needs donor count, donors who signed through web,donors who ...
4
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2answers
101 views
Wordy LINQ for XML word list
This code works as intended, however, I am sure that there is a way to condense the xmldataLoad method. If someone could maybe explain a better approach than what I ...
6
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1answer
81 views
Shuffling an arbitrary list or sequence
After reading this question I wanted to write a short example of how a list or sequence could be shuffled in .net. The result turned out to not be very short:
Program.cs
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7answers
1k views
Imposing a sort order on a query
I've always been told "never use goto, there's always a better way" and for the longest time I just accepted it. Lately though, I've been running into such scenarios in which I have to repeat this bit ...
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2answers
937 views
LINQ query that filters elements from a list of object
I have two lists of objects Person and PersonResult. Both are linked through the property ...
4
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2answers
171 views
Ordering filtered results
I have the following method which under code review gives me a CA1502 avoid excessive complexity error (although if I suppress the message it will build fine):
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0answers
121 views
Populating Charts with Chart.js
I have a dashboard page which populates some charts. They execute a Linq query to then transform the data into Json to populate the Chart.
These charts maybe used throughout the site, so I am ...
4
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2answers
142 views
Two functions to impose order on queries
I am writing a c# program to build generic sort algorithm on a request to a collection of data. The data needs to be sorted based on the supplied columns.I am using Entity framework and Expression ...
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2answers
87 views
Linq refactoring
I have some code that asynchronously load some point in chart when user drag it.
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1answer
75 views
Checking for user permissions
The idea here is we have Roles, Permissions, and a table called PermissionRoles that connect the two. So a Permissions can be in many Roles, and many Permissions can have the same Role. So what the ...
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278 views
Retrieving Primary Key from Entity Framework entity
Entity Framework (version 6) generates classes based on your tables that look like this (where each property represents a field in the table):
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Query against history table
I have this linq query that queries a table that retains any change history done to any of the tables is constructed like this:
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1answer
70 views
Extracting properties from stories
I have a list of items, and a list of actions that extract data from those items. I iterate over the list of items and create a Dictionary for each item that has the data extracted from the item.
I ...
2
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1answer
54 views
Convert two collections of different objects into a single collection
I am combining two lists of separate objects into a single combined list. The below code works perfectly but it is not the most elegant or efficient solution. Is there a better solution?
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3
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2answers
193 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 ...
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1answer
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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:
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3answers
120 views
Property Mapping with Reflection efficiency
I have an object that I am populating via mapping and lookup with Reflection:
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2answers
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2
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1answer
59 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
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293 views
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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
114 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
139 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
48 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
120 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
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1answer
75 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
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3answers
168 views
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104 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
82 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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3
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1answer
202 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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139 views
Grouping and summing values for food takeout
I have 4 properties which values I generate using LINQ:
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5
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2answers
135 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
197 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
367 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
95 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
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130 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
5k 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 ...
