select just the child collection in linq

Question

   List<ContractType> filteredContractTypes = contractTypes.Where(x => x.ContractTypeName == "SUA").ToList();
   List<ContractSubType> contractSubTypes = filteredContractTypes.Select(c => c.ContractSubTypes).ToList();

the class contract type has a collection of subcontracttypes. how can I select just the subcontracttypes in linq?

I am getting the below error

> Cannot implicitly convert type 
> 'System.Collections.Generic.List<System.Collections.Generic.IEnumerable<Models.ContractSubType>>'
> to 'System.Collections.Generic.List<Models.ContractSubType>'

Try this contractTypes.Where(x => x.ContractTypeName == "SUA").SelectMany(c => c.ContractSubTypes).ToList() — Zinov, Mar 25 '20 at 21:18

score 1 · Accepted Answer · answered Mar 25 '20 at 21:20

1

You have (2D List) But contractSubTypes is a 1D List! You can use var and then you realize your mistake.

var contractSubTypes = filteredContractTypes.Select(c => c.ContractSubTypes).ToList();

or you can use SelectMany to Flatten List in LINQ!

answered Mar 25 '20 at 21:20

AmirNorouzpour

1,119
1
11
26

select just the child collection in linq

1 Answers1