ObjectQuery.Context 屬性


取得與這個物件查詢相關聯的內容物件。Gets the object context associated with this object query.

 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



與這個 ObjectContext 執行個體 (Instance) 相關聯的 ObjectQuery<T>The ObjectContext associated with this ObjectQuery<T> instance.


本主題中的範例是以 Microsoft SQL Server 產品範例: Database為基礎。The example in this topic is based on the Microsoft SQL Server Product Samples: Database. 此範例會取得與這個 ObjectContext 物件相關聯的 ObjectQuery<T> 物件。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}",
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


查詢的內容包含連接、快取和中繼資料 (Metadata)。The context for the query includes the connection, cache, and metadata. 如需詳細資訊,請參閱物件服務概觀 (Entity Framework)For more information, see Object Services Overview (Entity Framework).

連接屬性是可變動的,而且您必須先設定連接屬性,然後才能執行查詢。The connection property is mutable and must be set before a query can be executed. 如需詳細資訊,請參閱 物件服務中的管理連接 (Entity Framework) For more information, see Managing Connections in Object Services (Entity Framework).