How to linq contains string list in C#?

Question

1.00/5 (2 votes)

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string variables=“ “;

foreach(var item in IDList)
{
variables += item.IdCode+”,”;
}

I want to variables use lambda expression but variables get 1,2,3,4 list.

var t=mystudent.tablea.where(x=>x.Id.Contains(variables).ToList();

But this code not run id value is 0.I want to 4 value.

What I have tried:

var t=mystudent.tablea.where(x=>x.Id.Contains(variables).ToList();

Posted 12-Jan-20 22:21pm

Member 14169626

Updated 12-Jan-20 22:58pm

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Maciej Los · Answer 1 · 2020-01-12T22:58:00

Solution 2

Try this:

C#

int[] ids= new int[]{1, 2, 4};
var t=mystudent.tablea.Where(x=> ids.Any(y=>y == x.Id)).ToList();

Posted 12-Jan-20 22:58pm

Maciej Los

Comments

Wendelius 17-Jan-20 14:48pm

A 5

Maciej Los 18-Jan-20 0:11am

Thank you very much, Mika.

jsc42 · Answer 2 · 2020-01-12T22:36:00

Try Googling

linq equivalent of sql 'in'

and see the Stack Overflow result.
Basically, I think you've got the test back-to-front. You're looking to see if ID contains a single value which is a string of concatenated values - it doesn't, it only contains a single value. You want to see if the list (big hint here) of values contains the single value that you are looking for.