JustInTimeActivationAttribute 类
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
打开或关闭实时 (JIT) 激活。 此类不能被继承。
public ref class JustInTimeActivationAttribute sealed : Attribute
[System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)]
[System.Runtime.InteropServices.ComVisible(false)]
public sealed class JustInTimeActivationAttribute : Attribute
[<System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)>]
[<System.Runtime.InteropServices.ComVisible(false)>]
type JustInTimeActivationAttribute = class
inherit Attribute
Public NotInheritable Class JustInTimeActivationAttribute
Inherits Attribute
- 继承
- 属性
示例
下面的代码示例演示了此属性的用法。
#using <System.Windows.Forms.dll>
#using <System.Transactions.dll>
#using <System.EnterpriseServices.dll>
using namespace System;
using namespace System::EnterpriseServices;
using namespace System::Windows::Forms;
[assembly:ApplicationName("ObjectInspector")];
[assembly:ApplicationActivation(ActivationOption::Server)];
[assembly:System::Reflection::AssemblyKeyFile("Inspector.snk")];
[JustInTimeActivation]
[ObjectPooling(MinPoolSize=2,MaxPoolSize=100,CreationTimeout=1000)]
public ref class ObjectInspector: public ServicedComponent
{
public:
String^ IdentifyObject( Object^ obj )
{
// Return this object to the pool after use.
ContextUtil::DeactivateOnReturn = true;
// Get the supplied object's type.
Type^ objType = obj->GetType();
// Return its name.
return (objType->FullName);
}
protected:
virtual void Activate() override
{
MessageBox::Show( String::Format( "Now entering...\nApplication: {0}\nInstance: {1}\nContext: {2}\n", ContextUtil::ApplicationId.ToString(), ContextUtil::ApplicationInstanceId.ToString(), ContextUtil::ContextId.ToString() ) );
}
virtual void Deactivate() override
{
MessageBox::Show( "Bye Bye!" );
}
// This object can be pooled.
virtual bool CanBePooled() override
{
return (true);
}
};
using System;
using System.EnterpriseServices;
using System.Windows.Forms;
[assembly: ApplicationName("ObjectInspector")]
[assembly: ApplicationActivation(ActivationOption.Server)]
[assembly: System.Reflection.AssemblyKeyFile("Inspector.snk")]
[JustInTimeActivation]
[ObjectPooling(MinPoolSize=2, MaxPoolSize=100, CreationTimeout=1000)]
public class ObjectInspector : ServicedComponent
{
public string IdentifyObject (Object obj)
{
// Return this object to the pool after use.
ContextUtil.DeactivateOnReturn = true;
// Get the supplied object's type.
Type objType = obj.GetType();
// Return its name.
return(objType.FullName);
}
protected override void Activate()
{
MessageBox.Show( String.Format("Now entering...\nApplication: {0}\nInstance: {1}\nContext: {2}\n",
ContextUtil.ApplicationId.ToString(), ContextUtil.ApplicationInstanceId.ToString(),
ContextUtil.ContextId.ToString() ) );
}
protected override void Deactivate()
{
MessageBox.Show("Bye Bye!");
}
// This object can be pooled.
protected override bool CanBePooled()
{
return(true);
}
}
Imports System.EnterpriseServices
Imports System.Windows.Forms
<Assembly: ApplicationName("ObjectInspector")>
<Assembly: ApplicationActivation(ActivationOption.Server)>
<Assembly: System.Reflection.AssemblyKeyFile("Inspector.snk")>
<JustInTimeActivation(), ObjectPooling(MinPoolSize := 2, MaxPoolSize := 100, CreationTimeout := 1000)> _
Public Class ObjectInspector
Inherits ServicedComponent
Public Function IdentifyObject(ByVal obj As [Object]) As String
' Return this object to the pool after use.
ContextUtil.DeactivateOnReturn = True
' Get the supplied object's type.
Dim objType As Type = obj.GetType()
' Return its name.
Return objType.FullName
End Function 'IdentifyObject
Protected Overrides Sub Activate()
MessageBox.Show(String.Format("Now entering..." + vbLf + "Application: {0}" + vbLf + "Instance: {1}" + vbLf + "Context: {2}" + vbLf, ContextUtil.ApplicationId.ToString(), ContextUtil.ApplicationInstanceId.ToString(), ContextUtil.ContextId.ToString()))
End Sub
Protected Overrides Sub Deactivate()
MessageBox.Show("Bye Bye!")
End Sub
' This object can be pooled.
Protected Overrides Function CanBePooled() As Boolean
Return True
End Function 'CanBePooled
End Class
注解
如果指定了 JIT 激活,则不得在 COM+ 目录中禁用它,反之亦然。 如果在 COM+ 目录中启用,则必须在组件上指定它。
对于在 COM+ 中配置的组件,JIT 激活默认为关闭,但如果请求自动事务,则会自动启用。
有关使用特性的详细信息,请参阅 特性。
构造函数
JustInTimeActivationAttribute() |
初始化 JustInTimeActivationAttribute 类的新实例。 无参数构造函数支持实时 (JIT) 激活。 |
JustInTimeActivationAttribute(Boolean) |
初始化 JustInTimeActivationAttribute 类的新实例,并可以选择通过将 |
属性
TypeId |
在派生类中实现时,获取此 Attribute 的唯一标识符。 (继承自 Attribute) |
Value |
获取 JustInTimeActivationAttribute 设置的值。 |
方法
Equals(Object) |
返回一个值,该值指示此实例是否与指定的对象相等。 (继承自 Attribute) |
GetHashCode() |
返回此实例的哈希代码。 (继承自 Attribute) |
GetType() |
获取当前实例的 Type。 (继承自 Object) |
IsDefaultAttribute() |
在派生类中重写时,指示此实例的值是否是派生类的默认值。 (继承自 Attribute) |
Match(Object) |
当在派生类中重写时,返回一个指示此实例是否等于指定对象的值。 (继承自 Attribute) |
MemberwiseClone() |
创建当前 Object 的浅表副本。 (继承自 Object) |
ToString() |
返回表示当前对象的字符串。 (继承自 Object) |
显式接口实现
_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) |
将一组名称映射为对应的一组调度标识符。 (继承自 Attribute) |
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr) |
检索对象的类型信息,然后可以使用该信息获取接口的类型信息。 (继承自 Attribute) |
_Attribute.GetTypeInfoCount(UInt32) |
检索对象提供的类型信息接口的数量(0 或 1)。 (继承自 Attribute) |
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) |
提供对某一对象公开的属性和方法的访问。 (继承自 Attribute) |