ObjectQuery<T>.Except(ObjectQuery<T>) ObjectQuery<T>.Except(ObjectQuery<T>) ObjectQuery<T>.Except(ObjectQuery<T>) ObjectQuery<T>.Except(ObjectQuery<T>) Method

Definición

Limita los resultados de la consulta excluyendo resultados basándose en los resultados de otra consulta de objeto.Limits the query results by excluding results based on the results of another object query.

public:
 System::Data::Objects::ObjectQuery<T> ^ Except(System::Data::Objects::ObjectQuery<T> ^ query);
public System.Data.Objects.ObjectQuery<T> Except (System.Data.Objects.ObjectQuery<T> query);
member this.Except : System.Data.Objects.ObjectQuery<'T> -> System.Data.Objects.ObjectQuery<'T>
Public Function Except (query As ObjectQuery(Of T)) As ObjectQuery(Of T)

Parámetros

query
ObjectQuery<T> ObjectQuery<T> ObjectQuery<T> ObjectQuery<T>

ObjectQuery<T> que representa los resultados que hay que excluir de la consulta.An ObjectQuery<T> that represents the results to exclude from the query.

Devoluciones

Nueva instancia de ObjectQuery<T> que es equivalente a la instancia original, pero aplicando EXCEPT basándose en la query especificada.A new ObjectQuery<T> instance that is equivalent to the original instance with EXCEPT applied based on the specified query.

Excepciones

El parámetro query es null o una cadena vacía.The query parameter is null or an empty string.

Ejemplos

En este ejemplo se basa en el modelo AdventureWorks Sales.This example is based on the AdventureWorks Sales Model. En el ejemplo, se usa el método Except para crear un nuevo objeto ObjectQuery<T> y, a continuación, se recorre en iteración el resultado de la nueva consulta.The example uses Except method to create a new ObjectQuery<T> object and then iterates through the result of the new query.

int productID = 900;
using (AdventureWorksEntities context =
    new AdventureWorksEntities())
{
    string queryString = @"SELECT VALUE product 
        FROM AdventureWorksEntities.Products AS product";

    ObjectQuery<Product> productQuery =
        new ObjectQuery<Product>(queryString,
            context, MergeOption.NoTracking);

    string queryString2 = @"SELECT VALUE product 
        FROM AdventureWorksEntities.Products 
        AS product WHERE product.ProductID < @productID";

    ObjectQuery<Product> productQuery2 =
        new ObjectQuery<Product>(queryString2,
            context, MergeOption.NoTracking);

    productQuery2.Parameters.Add(new ObjectParameter("productID", productID));

    ObjectQuery<Product> productQuery3 =
        productQuery.Except(productQuery2);

    Console.WriteLine("Result of Except");
    Console.WriteLine("------------------");

    // Iterate through the collection of Product items
    // after the Except method was called.
    foreach (Product result in productQuery3)
        Console.WriteLine("Product Name: {0}",
            result.ProductID);
}
Dim productID = 900
Using context As New AdventureWorksEntities()
    Dim queryString As String = "SELECT VALUE product FROM AdventureWorksEntities.Products AS product"
    Dim productQuery As New ObjectQuery(Of Product)(queryString, context, MergeOption.NoTracking)

    Dim queryString2 As String = "SELECT VALUE product FROM AdventureWorksEntities.Products " & _
        " AS product WHERE product.ProductID < @productID"
    Dim productQuery2 As New ObjectQuery(Of Product)(queryString2, context, MergeOption.NoTracking)
    productQuery2.Parameters.Add(New ObjectParameter("productID", productID))

    Dim productQuery3 As ObjectQuery(Of Product) = productQuery.Except(productQuery2)

    Console.WriteLine("Result of Except")
    Console.WriteLine("------------------")

    ' Iterate through the collection of Product items 
    ' after the Except method was called. 
    For Each result As Product In productQuery3
        Console.WriteLine("Product Name: {0}", result.ProductID)
    Next
End Using

Comentarios

Suministrado query que define los resultados que excluir debe ser del mismo tipo o de un tipo que es compatible con la ObjectQuery<T>.The supplied query that defines results to exclude must be of the same type or of a type that is compatible with the ObjectQuery<T>.

Parámetros que se definen en proporcionado query se combinan con los parámetros que se definen en el ObjectQuery<T> instancia.Parameters that are defined in the supplied query are merged with parameters that are defined in the ObjectQuery<T> instance. Los parámetros deben ser únicos en la ObjectParameterCollection combinada.Parameters must be unique in the combined ObjectParameterCollection. No puede haber dos parámetros en la colección combinada con el mismo nombre.There cannot be two parameters in the combined collection with the same name. Para obtener más información, consulte métodos del generador de consultas.For more information, see Query Builder Methods.

La consulta resultante hereda la conexión de la instancia de ObjectQuery<T> en la que se llamó a Except.The resulting query inherits the connection from the ObjectQuery<T> instance on which Except was called.

Se aplica a

Consulte también: