linq - Selecting distinct objects from collection of objects using lambda expressions -

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We have a project using Fluent NHibernate, an object called BluePart, with the property of Om of Type Om. 

  Public category BluePart: DomainEntity {... Public Virtual Om Om {get; Set; The OM object, including OemCode and OemDescription, has many properties.  
  Public class ohm: DomainEntity {... public virtual string OemCode {get; Set; } Public virtual string OemDescription {get; Set; }}  
 
 I am trying to create a Linux query through Lambda Express, which will get all the different ohm from a list of Blue Purses (2.7 million records). Ideally this class should be created (which runs in & lt; 1sec): 
 
  select specific o.OmCode, o. Internal oh oo oiiIid = b.om_id from OpenEditionation BluePart B-  
 
 The query I created below gives om, regardless of specificity. 
 
  var oem = repository.Query & lt; BluePart & gt; (). X = & gt; New Om {OemCode = x.Oem.OemCode, OemDescription = x.Oem.OemDescription}). ToList ();  
 
 I thought it would be easy to build this question, but this is not happening. When running GroupBy (.GroupBy (z => z.OemCode)), I keep an error by saying that property I am trying to do is not property of Group B (it should not be because I have a property I am grouping about: About Om:

How about: 

 var oem = repository query & lt; BluePart & gt; (). (X => New {OemCode = x.Oem.OemCode, OemDescription = x.Oem.OemDescription}.) Undoubtedly () .Olist ();

this only will give you special Code / description will be added, but it seems that you are interested in all.

Alternatively, using grouping: 

  var oem = repository. Query & lt; BluePart & gt; () .GroupBy (x = & new; {OemCode = x.Oem.OemCode, OemDescription = x.Oem.OemDescription}). To create a list ();  < / Pre> 
 This will group you all the  BluePart  organizations by the OEM code / description.

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