CODEWITHSUNDEEP
c#linqcontains
Jonathan Wood
Jonathan Wood

Reputation: 67283

Using Contains() on Collection of Anonymous Types

I'm still learning LINQ and I have a collection of anonymous types obtained using something like the following. [mycontext] is a placeholder for my actual data source:

var items = from item in [mycontext]
            select new { item.col1, item.col2, item.col3 };

How can I use items.Contains() to determine if items contains a matching value?

The value I am searching for is not an anonymous type. So I will need to write my own compare logic, preferably as a lambda expression.

Upvotes: 5

Views: 2996

Answers (3)

Brandon Moretz
Brandon Moretz

Reputation: 7631

Or you could use the "Any" method with a predicate.

bool exists = items.Any( i => {logic} );

Upvotes: 2

LukeH
LukeH

Reputation: 269528

If you prefer to use a predicate then you're probably better off using Any rather than Contains:

bool exists = items.Any(x => x.col1 == "foo"
                             && x.col2 == "bar"
                             && x.col3 == 42);

Upvotes: 4

Ed Chapel
Ed Chapel

Reputation: 6932

Try the LINQ Any() method:

if (items.Any(i => i.col1 == myOtherThing.Value))
{
    // Effectively Contains() == true
}

Upvotes: 3

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