Check if a value from one array exists in another array using linq

Question

I've got an list where myclass is defined with a few properties

List<MyClass> myClassList = new List<MyClass>();
myClassList.Add(new MyClass() { Id = 1, Name = "My first test", Key = "First" });
myClassList.Add(new MyClass() { Id = 2, Name = "My second test", Key = "Second" });

I then have a path i.e. c:\my folders\company name\My First Test, which I break into a string array using regex i.e. myArrayPath

I want to find if any elements of myClassList based on a given property i.e. Name can be found in any of the elements from myArrayPath and ideally I'd like to return the Key but if I return the object matching one of the element from myArrayPath, this will be just as good.

Is there a way to achieve this using linq and/or lambda expressions.

Thanks.

Save · Accepted Answer · 2013-09-20 16:39:21Z

11

This can be quite easily done with LINQ:

var keyResult = myClassList.Where(x=>myArrayPath.Contains(x.Name))
    .Select(x=>x.Key);

if you need it in the form of a list of an array, just add .ToList() or .ToArray() at the end of it.

answered Sep 20, 2013 at 16:39

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1 Comment

Thierry Over a year ago

Spot on!! I've just changed the above code slightly to return the actual key as all values in both arrays will be unique, so no need for a list to be returned. string key = myClassList.Where(x=>myArrayPath.Contains(x.Name)) .Select(x=>x.Key).First();

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