ObjectQuery.Context Propriedade

Definição

Obtém o contexto de objeto associado a esta consulta de objeto.Gets the object context associated with this object query.

public:
 property System::Data::Objects::ObjectContext ^ Context { System::Data::Objects::ObjectContext ^ get(); };
public System.Data.Objects.ObjectContext Context { get; }
member this.Context : System.Data.Objects.ObjectContext
Public ReadOnly Property Context As ObjectContext

Valor da propriedade

O ObjectContext associado a essa instância de ObjectQuery<T>.The ObjectContext associated with this ObjectQuery<T> instance.

Exemplos

O exemplo neste tópico é baseado no Microsoft SQL Server exemplos de produto: banco de dados.The example in this topic is based on the Microsoft SQL Server Product Samples: Database. O exemplo obtém o objeto ObjectContext associado a este objeto ObjectQuery<T>.The example gets the ObjectContext object associated with this ObjectQuery<T> object.

using (AdventureWorksEntities context =
    new AdventureWorksEntities())
{
    string queryString =
        @"SELECT VALUE contact FROM 
        AdventureWorksEntities.Contacts AS contact";

    ObjectQuery<Contact> contactQuery =
        new ObjectQuery<Contact>(queryString,
            context, MergeOption.NoTracking);

    // Get ObjectContext from ObjectQuery.
    ObjectContext objectContext = contactQuery.Context;
    Console.WriteLine("Connection string {0}",
        objectContext.Connection.ConnectionString);
}
Using context As New AdventureWorksEntities()
    Dim queryString As String = "SELECT VALUE contact FROM AdventureWorksEntities.Contacts AS contact"

    Dim contactQuery As New ObjectQuery(Of Contact)(queryString, context, MergeOption.NoTracking)

    ' Get ObjectContext from ObjectQuery. 
    Dim objectContext As ObjectContext = contactQuery.Context
    Console.WriteLine("Connection string {0}", objectContext.Connection.ConnectionString)
End Using

Comentários

O contexto para a consulta inclui a conexão, o cache e os metadados.The context for the query includes the connection, cache, and metadata. Para obter mais informações, consulte Visão geral dos serviços de objeto (Entity Framework).For more information, see Object Services Overview (Entity Framework).

A propriedade Connection é mutável e deve ser definida antes que uma consulta possa ser executada.The connection property is mutable and must be set before a query can be executed. Para obter mais informações, consulte Managing Connections in Serviços de objeto (Entity Framework).For more information, see Managing Connections in Object Services (Entity Framework).

Aplica-se a

Veja também