ObjectContext 建構函式 (String, String)
[此頁面專屬於 Entity Framework 第 6 版。最新版本可從 'Entity Framework' NuGet 套件取得。如需 Entity Framework 的詳細資訊，請參閱 msdn.com/data/ef。]
使用給定的連接字串 (Connection String) 和實體容器 (Container) 名稱，初始化 ObjectContext 類別的新執行個體。
命名空間： System.Data.Entity.Core.Objects
組件： EntityFramework (在 EntityFramework.dll 中)
語法
'宣告
<SuppressMessageAttribute("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors", Justification := "Class is internal and methods are made virtual for testing purposes only. They cannot be overrided by user.")> _
Protected Sub New ( _
connectionString As String, _
defaultContainerName As String _
)
'用途
Dim connectionString As String
Dim defaultContainerName As String
Dim instance As New ObjectContext(connectionString, _
defaultContainerName)
[SuppressMessageAttribute("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors", Justification = "Class is internal and methods are made virtual for testing purposes only. They cannot be overrided by user.")]
protected ObjectContext(
string connectionString,
string defaultContainerName
)
[SuppressMessageAttribute(L"Microsoft.Usage", L"CA2214:DoNotCallOverridableMethodsInConstructors", Justification = L"Class is internal and methods are made virtual for testing purposes only. They cannot be overrided by user.")]
protected:
ObjectContext(
String^ connectionString,
String^ defaultContainerName
)
[<SuppressMessageAttribute("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors", Justification = "Class is internal and methods are made virtual for testing purposes only. They cannot be overrided by user.")>]
new :
connectionString:string *
defaultContainerName:string -> ObjectContext
protected function ObjectContext(
connectionString : String,
defaultContainerName : String
)
參數
- connectionString
類型：System.String
連接字串，它也會提供中繼資料資訊的存取權。
- defaultContainerName
類型：System.String
預設實體容器的名稱。 當您透過此方法設定 defaultContainerName 時，此屬性會變成唯讀的。
例外狀況
| 例外狀況 | 條件 |
|---|---|
| ArgumentNullException | connectionString 是 null。 |
| ArgumentException | connectionString、defaultContainerName 或中繼資料工作空間無效。 |