Help in Select with LinQ -C#. Select with two Objects

Question

0.00/5 (No votes)

See more:

For example I have these objects.

<object1>
 <list1>
  <info>
  	<codedetails>A</code1>
  </info>
  <info>
  	<codedetails>B</code1>
  </info>
 </list1>
</object1>

<object2>
  <lst>
    <reference>1</reference>
	<info>
	       <code1>X</code1>
	</info>
	<info>
	       <code1>D</code1>
	</info>
  </lst>
  <lst>
    <reference>2</reference>
         <info>
		<code1>A</code1>
	</info>
	 <info>
		<code1>A</code1>
	</info>
  </lst>
    <lst>
    <reference>3</reference>
	<info>
		<code1>A</code1>
	</info>
	<info>
		<code1>B</code1>
	</info>
  </lst>
</object2>

In this case I need get the reference 3 because the two code1 agree ( A -> A, B-> B).
I try

var result = (from p in object1.list1
			   from f in object2.lst
			   where f.info.code1  == p.info.code1
			   select f.reference).FirstOrDefault();

The result of last code is the reference 2 but it will be the reference 3.
Can I the result of the reference 3 with LINQ?.
In this case I have two code ( A and B ) to compare, but I will have more.
Thank you very much.

Posted 25-Aug-14 21:15pm

Adrián Cejudo

Updated 25-Aug-14 23:00pm

v3

Add a Solution

Comments

Kumarbs 26-Aug-14 3:29am

In this case, the list properties are same names. Hence if you wrote a query the first property satisfies the condition then it comes in the result. So please try to change the property names.

Adrián Cejudo 26-Aug-14 3:42am

Yes.
For example I can change the property names of object1. Codedetails instead code1.
thanks for your comment.

[no name] 26-Aug-14 9:02am

not clear yet?

Adrián Cejudo 27-Aug-14 2:59am

No...
I can't get the reference 3.
It returns the reference 2.

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)

sankarsan parida · Answer 1 · 2014-08-26T21:20:00

Solution 1

you are using FirstOrDefault() to get the first result only. That's why it's giving only reference 2 not other.
if you need first result only then use

var result = (from p in object1.list1
			   from f in object2.lst
			   where f.info.code1  == p.info.code1
			   select f.reference).FirstOrDefault();

If you need both Result then use

var result = (from p in object1.list1
			   from f in object2.lst
			   where f.info.code1  == p.info.code1
			   select f.reference).ToList();

If you need last result only then use

var result = (from p in object1.list1
			   from f in object2.lst
			   where f.info.code1  == p.info.code1
			   select f.reference).LastOrDefault();

Posted 26-Aug-14 21:20pm

sankarsan parida

Updated 26-Aug-14 21:21pm

v2

Comments

Adrián Cejudo 27-Aug-14 4:05am

Yes.
But int this example I don't need get the reference 2, only the 3.
In this example If I use .LastOrDefault It rules.
But in other object, for example:
<object2>
<lst>
<reference>2</reference>
<info>
<code1>A</code1>
</info>
<info>
<code1>B</code1>
</info>
</lst>
<lst>
<reference>3</reference>
<info>
<code1>A</code1>
</info>
<info>
<code1>A</code1>
</info>
</lst>
</object2>
It doesn't rule because the result would be the reference 3 and It must be the reference 2 because codedetails A = code1 A and codedetals B = code1 B
Reference 2
A = A
B = B
I going to use toList() and after a foreach to compare the values.
Thank you very much Sankarsan.

[no name] 27-Aug-14 4:19am

you most welcome.
You can put condition wise selection query