C#LINQ lambda -to get data comparing fields from two lists

Question

1.00/5 (1 vote)

See more:

I have 2 Lists
ListOne ==> ID , Name, Value
ListTwo ==> ID, Desc, Value

Expected Values of ListOne
[1,A,200]
[1,A,300]
[1,A,520]
[2,B,300]
[2,B,350]
[2,B,400]
[3,C,40]
[3,C,20]

Values of ListTwo-Master Data
[1,Analog,500]
[2,Benefit,310]
[3,Chain,50]

My Requirement
I want to get a list(say ResultantList ) that will contain only the value that do not exceed the value of its corresponding ID in the ListTwo.

So the ResultantList is expected to have only the below data from ListOne
[1,A,520] ===> the value here is 520, 520 exceeds the value(500) of ID 1 in ListTwo
[2,B,350] ===> the value here is 350, 350 exceeds the value(310) of ID 2 in ListTwo
[2,B,400] ===> the value here is 400, 400 exceeds the value(310) of ID 2 in ListTwo
===>[...]There is no value from ID 3 (name as C) in ListOne ;as both values(40,20) having ID 3 (name C) in ListOne is less than the value 50 with ID 3 (Desc Chain) in ListTwo

What I have tried:

C#

ResultantList = ListOne.Where(s => ListTwo.Any(l => (l.ID == s.ID && s.Value> l.Value))) .ToList();

But this fetches all the values even if the value is less than its corresponding value (w.r.t ID) in ListTwo.

Posted 20-Aug-17 10:53am

jeAntoni

Updated 20-Aug-17 13:00pm

v2

Add a Solution

Comments

jeAntoni 22-Aug-17 13:52pm

This works fine. Somehow I had missed an assignment in between, and thus was seeing the right output.

ResultantList = ListOne.Where(s => ListTwo.Any(l => (l.ID == s.ID && s.Value> l.Value))) .ToList();

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Graeme_Grant · Answer 1 · 2017-08-20T13:00:00

Here are two different ways of doing it:

1. Standard Query

C#

var resultantList = from item1 in list1
                    join item2 in list2
                    on item1.Id equals item2.Id
                    where item1.value < item2.value
                    select item1;

2. Lambda Expressions

C#

var resultantList = list1.Where(item1 => 
                    list2.Any(item2 => item1.Id == item2.Id 
                            && item1.value < item2.value));

You can read more here: Query Syntax and Method Syntax in LINQ (C#) | Microsoft Docs[^]