HttpContext.CurrentNotification 属性

定义

获取一个 RequestNotification 值,该值指示当前正在处理的 HttpApplication 事件。Gets a RequestNotification value that indicates the current HttpApplication event that is processing.

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

异常

操作要求 IIS 7.0IIS 7.0 处于集成管道模式,并且要求 .NET Framework 至少为 3.0 版本。The operation requires integrated pipeline mode in IIS 7.0IIS 7.0 and at least the .NET Framework version 3.0.

示例

下面的示例演示如何使用 CurrentNotification 属性来确定处理当前请求的 HttpApplication 对象的哪个事件正在处理。The following example demonstrates how to use the CurrentNotification property to determine what event of the HttpApplication object that is handling the current request is being processed. 在此示例中,事件处理程序处理 HttpApplication 对象的多个事件,而 CurrentNotification 属性确定为正在处理的每个事件调用的代码。In the example, the event handler handles several events of the HttpApplication object, and the CurrentNotification property determines what code is invoked for each event being handled.

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

CurrentNotification 属性需要 IIS 7.0IIS 7.0 中的集成管道模式,并且至少 .NET Framework 版本3.0。The CurrentNotification property requires the integrated pipeline mode in IIS 7.0IIS 7.0 and at least the .NET Framework version 3.0. 如果可用,属性将返回 RequestNotification 值。When available, the property returns a RequestNotification value. CurrentNotification 属性的值指示 HttpApplication 实例中当前正在处理请求的事件。The value of the CurrentNotification property indicates which event in the HttpApplication instance is currently processing the request.

不应设置 CurrentNotification 属性。The CurrentNotification property is not intended to be set. 相反,它是在 ASP.NET 管道中处理请求期间 IIS 7.0IIS 7.0 设置的。Instead, it is set by IIS 7.0IIS 7.0 during the processing of the request in the ASP.NET pipeline. 设置 CurrentNotification 属性将导致编译错误。Setting the CurrentNotification property will result in a compilation error.

.NET Framework 版本3.5 中引入了 CurrentNotificationCurrentNotification is introduced in the .NET Framework version 3.5. 有关详细信息,请参见版本和依赖关系For more information, see Versions and Dependencies.

适用于

另请参阅