Linq list inside List query

Question

Class A
{
   string name;
   IList<A> minorList = new List<A>();
}

IList<A> majorList = new List<A>();

I Want to get the instance of A from majorList depending upon the name value, but it is not necessary to have it in the majorList. minorList can also contain the name. How can I get it using Linq. If it is there in only majorList I can get it by using

A a = majorList.First(s => s.Name == "Name");

How about if it is not in the majorList but in some of the List of instance of majorList?

Jon Skeet · Accepted Answer · 2012-06-12 10:28:42Z

3

Sounds like you want something like:

bool ContainsName(A a, string name)
{
    return a.name == name || a.minorList.Any(x => ContainsName(x, name));
}

Then:

A a = majorList.First(x => ContainsName(x, name));

Of course you end up with a problem if there are any cycles in your lists...

edited Jun 12, 2012 at 10:28

answered Jun 12, 2012 at 10:05

Jon Skeet

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4 Comments

Niranjan Singh Over a year ago

Hi Jon, is this correct one?? A a = majorList.First(x => {return a.name == name || minorList.Any(x => ContainsName(x, name));});

Jon Skeet Over a year ago

@NiranjanKala: No - you've got to have the method otherwise you can't call it recursively... and if you've got the method, you might as well call it from the lambda expression.

Niranjan Singh Over a year ago

thanks Jon, +1 for resolving my confusion and this nice answer.

Vikram Over a year ago

Thanks a lot for Jon for the great answer.

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