c# - The type arguments for method cannot be inferred from the usage. Try specifying the type arguments ex - error. Any guidance? - 


  /// & lt; Summary & gt; /// Find all areas of parents without areas of children /// & lt; / Summary & gt; /// & lt; Returns & gt; Area filled with IQueryable Object & Lt; / Returns & gt; Public IQueryable FindParentAreas () {Returns db.Areas.SelectMany (x = & gt; x.ParentAreaID == Faucet); }

I want to return a collection of area objects which are basic areas, which means they have zero values ​​in the parent array ID (in my database).

It seems that I can not compare it to tap because the meaning of zero in C # is something else in the Microsoft SQL Server.

Any guidance? Am I using SelectMany as well?

:

Each element projects an IEnumerable & lt; T & gt; And level the resulting sequence into a sequence.

:

Filters the sequence of values ​​based on a predicate.

I think that you where : 

  public IQueryable & lt; Region & gt; FindParentAreas () {returns db.Areas.Where (x => x.ParentAreaID == faucet); }

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