HttpContext.CurrentNotification 属性

定义

命名空间:

System.Web

程序集:

System.Web.dll

获取一个 RequestNotification 值，该值指示正在处理的当前 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

其中一个 RequestNotification 值。

例外

PlatformNotSupportedException

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

示例

以下示例演示如何使用 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 HttpApplication 多个事件，并且 CurrentNotification 该属性确定为所处理的每个事件调用了哪些代码。

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 属性需要 IIS 7.0 和至少 .NET Framework 版本 3.0 中的集成管道模式。 如果可用，该属性将返回一个 RequestNotification 值。 该属性的值 CurrentNotification 指示实例中的 HttpApplication 哪个事件当前正在处理请求。

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

CurrentNotification 在 .NET Framework 版本 3.5 中引入。 有关详细信息，请参阅 版本和依赖项。

另请参阅

• IsPostNotification
• RequestNotification