CODEWITHSUNDEEP
.netlistc#-4.0
Newbie
Newbie

Reputation: 361

how to check if a c# list contains only the given value ??

I want to check a list for a given value and the list should contain only the given value. Say for example

List<string> alltypes = new List<string>();

i want to check 'alltypes' for something like a value 'sedan' and if that is the only element in the list alltypes then return true

Appreciate any help..thank u

Upvotes: 1

Views: 3096

Answers (2)

Kevin Brady
Kevin Brady

Reputation: 1724

use Linq All query - will return true if all members of the list match the input query

var result = alltypes.Count > 0 && alltypes.All(a => a == "sedan")

result will be true if list only contains strings of "sedan"

Upvotes: 2

Craig Suchanec
Craig Suchanec

Reputation: 10804

Depends if you are saying there should be one and only one value

var result = alltypes.Length == 1 && alltypes[0] == "sedan"

or if you are saying all the values in the the list (and there may be many)

var result = alltypes.Length > 0  && alltypes.All(a => a == "sedan")

Careful with All as it will return true if the list is empty:

true if every element of the source sequence passes the test in the specified predicate, or if the sequence is empty; otherwise, false.

Upvotes: 2

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