ObjectContext 构造函数 (String)
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使用给定连接字符串和默认实体容器名称初始化 ObjectContext 类的新实例。
命名空间： System.Data.Entity.Core.Objects
程序集： EntityFramework（在 EntityFramework.dll 中）
语法
声明
<SuppressMessageAttribute("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope", Justification := "Object is in fact passed to property of the class and gets Disposed properly in the Dispose() method.")> _
Public Sub New ( _
connectionString As String _
)
用法
Dim connectionString As String
Dim instance As New ObjectContext(connectionString)
[SuppressMessageAttribute("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope", Justification = "Object is in fact passed to property of the class and gets Disposed properly in the Dispose() method.")]
public ObjectContext(
string connectionString
)
[SuppressMessageAttribute(L"Microsoft.Reliability", L"CA2000:DisposeObjectsBeforeLosingScope", Justification = L"Object is in fact passed to property of the class and gets Disposed properly in the Dispose() method.")]
public:
ObjectContext(
String^ connectionString
)
[<SuppressMessageAttribute("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope", Justification = "Object is in fact passed to property of the class and gets Disposed properly in the Dispose() method.")>]
new :
connectionString:string -> ObjectContext
public function ObjectContext(
connectionString : String
)
参数
- connectionString
类型：System.String
连接字符串，该连接字符串还提供对元数据信息的访问。
异常
| 例外 | 条件 |
|---|---|
| ArgumentNullException | connectionString 为 null。 |
| ArgumentException | connectionString 无效或元数据工作区无效。 |