HttpContext.CurrentNotification 屬性

定義

命名空間:

System.Web

組件:

System.Web.dll

取得 RequestNotification 值，表示目前正在處理的 HttpApplication 事件。

public:
 property System::Web::RequestNotification CurrentNotification { System::Web::RequestNotification get(); };

public System.Web.RequestNotification CurrentNotification { get; }

member this.CurrentNotification : System.Web.RequestNotification

Public ReadOnly Property CurrentNotification As RequestNotification

屬性值

RequestNotification

其中一個 RequestNotification 值。

例外狀況

PlatformNotSupportedException

此作業需要 IIS 7.0 中的整合式管線模式，以及至少.NET Framework 3.0 版。

範例

下列範例示範如何使用 CurrentNotification 屬性來判斷正在處理目前要求的物件事件 HttpApplication 。 在此範例中，事件處理常式會處理 物件的數個 HttpApplication 事件，而 CurrentNotification 屬性會決定針對所處理的每個事件叫用的程式碼。

using System;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;

// Module that demonstrates one event handler for several events.
namespace Samples
{
    public class ModuleExampleTestCS : IHttpModule
    {
        public ModuleExampleTestCS()
        {
            // Constructor
        }
        public void Init(HttpApplication app)
        {
            app.AuthenticateRequest += new EventHandler(App_Handler);
            app.PostAuthenticateRequest += new EventHandler(App_Handler);
            app.LogRequest += new EventHandler(App_Handler);
            app.PostLogRequest += new EventHandler(App_Handler);
        }
        public void Dispose()
        {
        }
        // One handler for AuthenticationRequest, PostAuthenticateRequest,
    // LogRequest, and PostLogRequest events
        public void App_Handler(object source, EventArgs e)
        {
            HttpApplication app = (HttpApplication)source;
            HttpContext context = app.Context;

            if (context.CurrentNotification == RequestNotification.AuthenticateRequest)
            {

                if (!context.IsPostNotification)
                {
                    // Put code here that is invoked when the AuthenticateRequest event is raised.
                }
                else
                {
                    // PostAuthenticateRequest 
                    // Put code here that runs after the AuthenticateRequest event completes.
                }
            }
            if (context.CurrentNotification == RequestNotification.LogRequest)
            {
                if (!context.IsPostNotification)
                {
                    // Put code here that is invoked when the LogRequest event is raised.
                }
                else
                {
                    // PostLogRequest
                    // Put code here that runs after the LogRequest event completes.
                }
            }
        }
    }
}

Imports System.Data
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI

' Module that demonstrates one event handler for several events.
Namespace Samples

    Public Class ModuleExampleTestVB
        Implements IHttpModule

        Public Sub New()
            ' Constructor
        End Sub

        Public Sub Init(ByVal app As HttpApplication) Implements IHttpModule.Init
            AddHandler app.AuthenticateRequest, AddressOf Me.App_Handler
            AddHandler app.PostAuthenticateRequest, AddressOf Me.App_Handler
            AddHandler app.LogRequest, AddressOf Me.App_Handler
            AddHandler app.PostLogRequest, AddressOf Me.App_Handler
        End Sub

        Public Sub Dispose() Implements IHttpModule.Dispose
        End Sub

        ' One handler for AuthenticationRequest, PostAuthenticateRequest,
    ' LogRequest, and PostLogRequest events
        Public Sub App_Handler(ByVal source As Object, ByVal e As EventArgs)
            Dim app As HttpApplication = CType(source, HttpApplication)
            Dim context As HttpContext = app.Context

            If (context.CurrentNotification = RequestNotification.AuthenticateRequest) Then

                If Not (context.IsPostNotification) Then

                    ' Put code here that is invoked when the AuthenticateRequest event is raised.
                Else

                    ' PostAuthenticateRequest 
                    ' Put code here that runs after the AuthenticateRequest event completes.

                End If
            End If

            If (context.CurrentNotification = RequestNotification.LogRequest) Then

                If Not (context.IsPostNotification) Then

                    ' Put code here that is invoked when the LogRequest event is raised.

                Else
                    ' PostLogRequest
                    ' Put code here that runs after the LogRequest event completes.

                End If
            End If
        End Sub
    End Class

End Namespace

備註

屬性 CurrentNotification 需要 IIS 7.0 中的整合式管線模式，以及至少.NET Framework 3.0 版。 當可用時，屬性會傳 RequestNotification 回值。 屬性的值 CurrentNotification 表示實例中的 HttpApplication 哪個事件目前正在處理要求。

屬性 CurrentNotification 不是要設定的。 相反地，IIS 7.0 會在處理 ASP.NET 管線中要求時加以設定。 CurrentNotification設定 屬性會導致編譯錯誤。

CurrentNotification.NET Framework 3.5 版引進。 如需詳細資訊，請參閱版本和相依性。

另請參閱

• IsPostNotification
• RequestNotification