CODEWITHSUNDEEP
c#lambda
user1394622
user1394622

Reputation: 67

Comparing two list C#

I have entity which is as follows

public class A
{
    public virtual int Id { get; set; }
    public virtual string AccountName { get; set; }
    public virtual string AccountId { get; set; }
    public virtual Status Status { get; set; }
    public virtual IList<Service> Services { get; set; }
}

I have another list which is of type Services which i want to compare with entity A.Services and get only those results of A which are matching (the same).

I want a lambda express or some way

Upvotes: 0

Views: 1479

Answers (4)

jaybeeuu
jaybeeuu

Reputation: 1123

Why not just have a method on class A that does it, then you don't need to bother with IEquatable...

public class A
{
    public virtual int Id { get; set; }
    public virtual string AccountName { get; set; }
    public virtual string AccountId { get; set; }
    public virtual Status Status { get; set; }
    public virtual IList<Service> Services { get; set; }

    public List<Service> GetCommonServices(A compareTo)
    {
         return this.Services.Intersect(compareTo.Services);
    }
}

Upvotes: 0

David
David

Reputation: 16277

You can have you class implement IEquatable, and then use Linq Intersect.

public class A : IEquatable<A>
{
    public virtual int Id { get; set; }
    public virtual string AccountName { get; set; }
    public virtual string AccountId { get; set; }
    public virtual Status Status { get; set; }
    public virtual IList<Service> Services { get; set; }

    //Implement IEquatable interfaces 
    //...
}

Note that when using LINQ Intersection call, use below one:

public static IEnumerable<TSource> Intersect<TSource>(
          this IEnumerable<TSource> first,
          IEnumerable<TSource> second,
          IEqualityComparer<TSource> comparer) //  <--- This is important

Upvotes: 2

Damith
Damith

Reputation: 63065

Implement IEquatable<Service> and then you can use Intersect as below 

var common = services1.Intersect(services2);

Upvotes: 0

Soner G&#246;n&#252;l
Soner G&#246;n&#252;l

Reputation: 98750

You can use Enumerable.Intersect method.

Produces the set intersection of two sequences by using the default equality comparer to compare values.

public class A : IEquatable<Service>
{
    public virtual int Id { get; set; }
    public virtual string AccountName { get; set; }
    public virtual string AccountId { get; set; }
    public virtual Status Status { get; set; }
    public virtual IList<Service> Services { get; set; }
}

var commonListofService = services1.Intersect(services2);

Upvotes: 1

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