MarshalByRefObject.InitializeLifetimeService 方法

定义

命名空间:
System
程序集:
mscorlib.dll, netstandard.dll, System.Runtime.dll

获取生存期服务对象来控制此实例的生存期策略。Obtains a lifetime service object to control the lifetime policy for this instance.

public:
 virtual System::Object ^ InitializeLifetimeService();
[System.Security.SecurityCritical]
public virtual object InitializeLifetimeService ();
abstract member InitializeLifetimeService : unit -> obj
override this.InitializeLifetimeService : unit -> obj
Public Overridable Function InitializeLifetimeService () As Object

返回

Object

ILease 类型的对象，用于控制此实例的生存期策略。An object of type ILease used to control the lifetime policy for this instance. 这是此实例当前的生存期服务对象（如果存在）；否则为初始化为 LeaseManagerPollTime 属性的值的新生存期服务对象。This is the current lifetime service object for this instance if one exists; otherwise, a new lifetime service object initialized to the value of the LeaseManagerPollTime property.

属性
SecurityCriticalAttribute

异常

SecurityException

直接调用方没有基础结构权限。The immediate caller does not have infrastructure permission.

示例

下面的代码示例演示如何创建租约。The following code example demonstrates creating a lease.

public ref class MyClass: public MarshalByRefObject
{
public:
   
   [System::Security::Permissions::SecurityPermissionAttribute
   (System::Security::Permissions::SecurityAction::Demand,
   Flags=System::Security::Permissions::SecurityPermissionFlag::Infrastructure)]
   virtual Object^ InitializeLifetimeService() override
   {
      ILease^ lease = dynamic_cast<ILease^>(MarshalByRefObject::InitializeLifetimeService());
      if ( lease->CurrentState == LeaseState::Initial )
      {
         lease->InitialLeaseTime = TimeSpan::FromMinutes( 1 );
         lease->SponsorshipTimeout = TimeSpan::FromMinutes( 2 );
         lease->RenewOnCallTime = TimeSpan::FromSeconds( 2 );
      }

      return lease;
   }

};


public class MyClass : MarshalByRefObject
{
  [SecurityPermissionAttribute(SecurityAction.Demand, 
                               Flags=SecurityPermissionFlag.Infrastructure)]
  public override Object InitializeLifetimeService()
  {
    ILease lease = (ILease)base.InitializeLifetimeService();
    if (lease.CurrentState == LeaseState.Initial)
    {
         lease.InitialLeaseTime = TimeSpan.FromMinutes(1);
         lease.SponsorshipTimeout = TimeSpan.FromMinutes(2);
          lease.RenewOnCallTime = TimeSpan.FromSeconds(2);
    }
      return lease;
  }
}

Public Class LSClass
    Inherits MarshalByRefObject
    
    <SecurityPermissionAttribute(SecurityAction.Demand, _
                                 Flags:=SecurityPermissionFlag.Infrastructure)> _
    Public Overrides Function InitializeLifetimeService() As Object
        Dim lease As ILease = CType(MyBase.InitializeLifetimeService(), ILease)
        If lease.CurrentState = LeaseState.Initial Then
            lease.InitialLeaseTime = TimeSpan.FromMinutes(1)
            lease.SponsorshipTimeout = TimeSpan.FromMinutes(2)
            lease.RenewOnCallTime = TimeSpan.FromSeconds(2)
        End If
        Return lease
    End Function


    Public Shared Sub Main()  
    ' The main thread processing is here.
    End Sub
End Class

注解

有关生存期服务的详细信息，请参阅LifetimeServices类。For more information about lifetime services, see the LifetimeServices class.

安全性

SecurityCriticalAttribute
需要对直接调用方的完全信任。requires full trust for the immediate caller. 部分受信任的或透明的代码不能使用此成员。This member cannot be used by partially trusted or transparent code.

适用于