CODEWITHSUNDEEP
c#linqlinq-to-objects
TheBoubou
TheBoubou

Reputation: 19903

Linq : copy a value to another

I have a collection of this object :

public Class MyObject()
{
    public int Id { get; set; }
    public int Code { get; set; }
    public string NL { get; set; }
    public string FR { get; set; }
    public string Value { get; set; }
}

I have this

IList<MyObject> listObject = new List<Object>();
bool res = MyMethod();

I'd like depending of the res result copy all the value of FR to Value and from NL to Value if res is false :

I try this :

var res = (from p in listObject select new { Id = p.Id, Value = ??????  });

the ?????? reprsent the code I don't find :(

Any idea ?

Thanks,

UPDATE1 I made a more generic method :

  public void MyTest<T>(IList<T> list) where T : ILookup
    {

        bool res = MyMethod();
        var result = (from p in list select new { Id = p.Id, Value = res? p.FR : p.NL });
        return result;

    }

What is the return type ?

Upvotes: 2

Views: 3038

Answers (2)

Andy Rose
Andy Rose

Reputation: 16984

A conditional or ternary operator will help here. An example of how it work is:

var result = booleanExpression ? valueIfTrue : valueIfFalse;

applied to your code it would look something like this:

var copy = (from p in listObject select new { Id = p.Id, Value = res ? p.FR : p.NL});

If you wish the result to be returnable from the method you will have to use a class with your select statement rather than createing an anonymous type:

var copy = (from p in listObject select new MyObject { Id = p.Id, Value = res ? p.FR : p.NL});

where MyObject has properties defined as Id and Value. You could then return it as 

IEnumerable<MyObject >.

Upvotes: 5

DavW
DavW

Reputation: 886

Use the ternary operator

var result = (from p in listObject select new { Id = p.Id, Value = res ? p.FR : p.NL  });

Upvotes: 4

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