How do I use Linq to obtain a unique list of properties from a list of objects

Question

I m trying to use Linq to return a list of ids given a list of objects where the id is a property  I d like to be able to do this without looping through each object and pulling out the unique ids that I find   I have a list of objects of type MyClass and one of the properties of this class is an ID   public class MyClass     public int ID   get  set        What I want to do is write a Linq query to return me a list of those Ids  How do I do that given an IList lt MyClass gt  such that it returns an IEnumerable lt int gt  of the ids   I m sure it must be possible to do it in one or two lines using Linq rather than looping through each item in the MyClass list and adding the unique values into a list   Any help in creating an elegant solution would be much appreciated

User · Answer

Using straight Linq  with the Distinct   extension    var idList    from x in yourList select x ID  Distinct

User · Answer

int   numbers    1 2 3 4 5 3 6 4 7 8 9 1 0            var nonRepeats    from n in numbers select n  Distinct              foreach  var d in nonRepeats                         Response Write d               OUTPUT  1234567890

User · Answer

Use the Distinct operator   var idList   yourList Select x  gt  x ID  Distinct

User · Answer

When taking Distinct we have to cast into IEnumerable too  If list is  model means  need to write code like this   IEnumerable lt T gt  ids   list Select x   gt  x  Distinct

User · Answer

IEnumerable lt int gt  ids   list Select x  gt x ID  Distinct

[linq] How do I use Linq to obtain a unique list of properties from a list of objects?

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