selecting members from a dictionary with Linq - Operator '&&' cannot be applied to operands of type 'int' and 'bool'

Question

User379720387 posted

pack.Data.Values contains several dictionary objects.

It is passed into a method for further processing. In the method there is some linq code that returns a list of endPointIds:

dp.Select(d => d.EndpointId) 

Stuff is done with that list of endPoints.

I need to add an extra condition to that linq code to only get those where the doProcess flag is set to true.

doProcess is a nullable bool

dp.Select(d => d.EndpointId && d.doProcess.HasValue)

and also tried

dp.Select(d => d.EndpointId && (d.doProcess ?? true))

Either results in the error message from the title.

How to correct this?

TIA

Answer 1

User1120430333 posted

If it really is a Boolean value

dp.Select.Where(d => d.doProcess) // it's implied that the Boolean value is = true

or

 dp.Select.Where(d => d.doProcess == true)

I don't know what d.EndpointId is about in some selection criteria based on a Where clause. 

Answer 2

User379720387 posted

In simple form:

endPointId / doProcess

6 / false

8 / true

12 / true

16 / false

Currently I am getting a list of 6 8 12 16

What I need is 8 12

How can I achieve that?

The dp.Select(d => d.EndpointId) just takes the endPointId from each object.

Answer 3

User1120430333 posted

var results = (from a in dp.where(d =>  d.Value == true) select a.Key, a.Value).ToList(); 

foreach(var result in results)
{
   var key = result.Key;
   var value = result.Value; 
}

I don't know try it.

http://www.java2s.com/Code/CSharp/LINQ/UseLINQwithDictionary.htm

Answer 4

User379720387 posted

Figured it out: problem was my lack of understanding the difference between SELECT and WHERE in Linq.

Very well explained here: https://stackoverflow.com/questions/1212746/linq-what-is-the-difference-between-select-and-where

I was trying to combine a SELECT and WHERE in the same Linq magic.

This came to light after I broke the functionality into two.