LINQ - Compare List objects and List of strings

Question

I have a list of objects (List1) and list of string (List2 - list of Names of the objects)

I need to get all objects from List1 if the object.Name does not exists in List2

How can write this LINQ C#.?

Possible duplicate of Quickest way to compare two List<>. I realize this is string vs. object, but Skeet's answer refers to that issue specifically in the comments as well. — ruffin
– ruffin, Commented Oct 15, 2018 at 13:00

Alper Tunga Arslan · Accepted Answer · 2017-02-09 08:30:17Z

13

public class Class1
{
    public string Name {get;set;}
}

var List1 = new List<Class1>();
var List2 = new List<string>();
var result = List1.Where(x=>!List2.Contains(x.Name)).ToList();

Or:

var result = List1.Where(x=>!List2.Any(n=>n==x.Name)).ToList();

edited Feb 9, 2017 at 8:30

Alper Tunga Arslan

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answered Feb 9, 2017 at 7:42

Maksim Simkin

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Comments

Amol B Lande · Accepted Answer · 2017-02-09 10:30:34Z

class Program
{
    static void Main(string[] args)
    {

        List<List1Class> listClass = new List<List1Class>();

        listClass.Add(new List1Class { ObjectName = "obj1" });
        listClass.Add(new List1Class { ObjectName = "obj2" });
        listClass.Add(new List1Class { ObjectName = "obj3" });
        listClass.Add(new List1Class { ObjectName = "obj4" });

        List<string> listString = new List<string>();
        listString.Add("obj2");
        listString.Add("obj4");
        listString.Add("obj5");

        var filterlist = listClass.Where(l => !listString.Contains(l.ObjectName)).ToList();

    }
}

class List1Class { public string ObjectName { get; set; }

    //Add other property
}

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