LINQ to Entities - Wie SQL-Abfrage konvertieren (UnionAggregate) in LINQ

Question

Ich mag die folgende SQL-Abfrage in seiner LINQ zu Entity-Version konvertieren:

select 
geometry::UnionAggregate(geometries.GeometryBounds) 
from 
(select 
    GeometryBounds 
    from 
    Province where id in (1, 2) 
    union all 
    select 
    GeometryBounds 
    from 
    Region where id in (1, 2) 
    union all 
    select 
    GeometryBounds 
    from 
    Country where id in (1, 2) 
) as geometries 

Answer 1

In LINQ Vereinigung all funktionalen zur Verfügung gestellt von Collection.Concat() Methode.

var ID = new[] {1, 2}; 

var query = (youContext.Province 
      .Select(x => x.GeometryBounds)) 
      .Concat 
      (youContext.Region 
      .Select(x => x.GeometryBounds)) 
      .Concat 
      (youContext.Country 
      .Select(x => x.GeometryBounds));