HttpContext.CurrentNotification 属性

定义

命名空间:

System.Web

程序集:

System.Web.dll

获取一个 RequestNotification 值，该值指示当前正在处理的 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

属性值

RequestNotification

RequestNotification 值之一。

例外

PlatformNotSupportedException

此操作要求 IIS 7.0 和至少.NET Framework版本 3.0 中的集成管道模式。

示例

下面的示例演示如何使用 CurrentNotification 属性来确定正在处理当前请求的对象的事件 HttpApplication 。 在此示例中，事件处理程序处理对象的多个事件 HttpApplication ，并且该 CurrentNotification 属性确定为每个正在处理的事件调用的代码。

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

注解

该CurrentNotification属性要求 IIS 7.0 和至少.NET Framework版本 3.0 中的集成管道模式。 当可用时，该属性将返回一个 RequestNotification 值。 属性的值 CurrentNotification 指示实例中 HttpApplication 当前正在处理请求的事件。

该 CurrentNotification 属性不打算设置。 而是由 IIS 7.0 在 ASP.NET 管道中处理请求期间设置的。 CurrentNotification设置属性将导致编译错误。

CurrentNotification在 .NET Framework 版本 3.5 中引入。 有关详细信息，请参见版本和依赖关系。

另请参阅

• IsPostNotification
• RequestNotification