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LINQ question

Posted on 2016-11-08
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Last Modified: 2016-11-08
Dear Experts,
How do I can combine the results in this LINQ query?

c.field == 1 below generates results and c.field == 3 generates results but how can I show the list of both results together. This below generates no results.  I guess one is cancelling out the other.

var today = DateTime.Now.Date;
var tomorrow = today.AddDays(1);

var query = from c in databasetable
						  where c.date > today && c.date < tomorrow
						  && c.field == 1 
						  && c.field == 3
						  select c;
						  
query.Dump();

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Question by:sunny-j
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7 Comments
 
LVL 28

Accepted Solution

by:
Pawan Kumar earned 500 total points
ID: 41878272
Try..

var today = DateTime.Now.Date;
var tomorrow = today.AddDays(1);

var query = from c in databasetable
						  where c.date > today && c.date < tomorrow
						  && ( c.field == 1 
						  || c.field == 3 )
						  select c;
						  
query.Dump();

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0
 
LVL 44

Expert Comment

by:AndyAinscow
ID: 41878280
>>I guess one is cancelling out the other.

Yes.  The && means and and c.field can't be equal to 1 and 3 and the same time.  The || (previous comment by the other expert) means or.  So it matches c.field to either 1 or 3
0
 

Author Comment

by:sunny-j
ID: 41878287
Thank you for your comments. I do want results from c.field == 1 and c.field == 3 (these are states in a picklist) so do I need to approach this differently, maybe by grouping the results.  The II will give me one or the other so doesn't solve my issue.  Any further help must appreciated.
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LVL 28

Expert Comment

by:Pawan Kumar
ID: 41878298
On column c cannot have 2 values at the same time. It can either have 1 or 3 at the same time.  You need to create 2 queries and then perform your logic.

var today = DateTime.Now.Date;
var tomorrow = today.AddDays(1);

var query = from c in databasetable
						  where c.date > today && c.date < tomorrow
						  && ( c.field == 1 )						 
						  select c;

var query1 = from c in databasetable
						  where c.date > today && c.date < tomorrow
						  && ( c.field == 3 )						 
						  select c;
						  
query.Dump();
query1.Dump(); 

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0
 
LVL 44

Expert Comment

by:AndyAinscow
ID: 41878301
Using the || operator will give from both c.field=1 and c.field=3.  Which is what you want you say.
1
 

Author Comment

by:sunny-j
ID: 41878307
ignore, the above worked. Thank you for your help.
0
 
LVL 28

Expert Comment

by:Pawan Kumar
ID: 41878311
Great ! Welcome !!
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