HttpHandler 工厂

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最新推荐文章于 2023-12-30 17:21:58 发布

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本文介绍如何通过实现IHttpHandlerFactory接口创建HTTPHandler工厂，根据不同HTTP请求类型生成对应的处理程序实例，包括同步和异步处理程序，并展示了配置示例。

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HttpHandler 工厂

通过创建实现 IHttpHandlerFactory 接口的类，可以为每个 HTTP 请求生成新的处理程序实例。在下面的示例中，将用一个 HttpHandler 工厂为 HTTP GET 请求和 HTTP POST 请求创建不同的处理程序。其中一个处理程序是上面示例中的同步处理程序的实例；另一个处理程序则是异步处理程序示例的实例。

[C#]
using System;
using System.Web;

namespace Handlers
{
    class HandlerFactory : IHttpHandlerFactory
    {
        public IHttpHandler GetHandler(HttpContext context, string requestType, String url, String pathTranslated)
        {         
            IHttpHandler handlerToReturn;
            if("get" == context.Request.RequestType.ToLower())
            {
                handlerToReturn = new SynchHandler();
            }
            else if("post" == context.Request.RequestType.ToLower())
            {
                handlerToReturn = new AsynchHandler();
            }
            else
            {
                handlerToReturn = null;
            }
            return handlerToReturn;
        }
        public void ReleaseHandler(IHttpHandler handler)
        {
        }
        public bool IsReusable
        {
            get
            {
                // To enable pooling, return true here.
                // This keeps the handler in memory.
                return false;
            }
        }
    }
}


[Visual Basic]
Imports System
Imports System.Web

Namespace Handlers
    Class HandlerFactory
        Implements IHttpHandlerFactory

        Public Function GetHandler(ByVal context As HttpContext, ByVal requestType As String, ByVal url As [String], ByVal pathTranslated As [String]) As IHttpHandler Implements IHttpHandlerFactory.GetHandler            
            Dim handlerToReturn As IHttpHandler
            If "get" = context.Request.RequestType.ToLower() Then
                handlerToReturn = New SynchHandler()
            Else
                If "post" = context.Request.RequestType.ToLower() Then
                    handlerToReturn = New AsynchHandler()
                Else
                    handlerToReturn = Nothing
                End If
            End If
            Return handlerToReturn
        End Function

        Public Sub ReleaseHandler(ByVal handler As IHttpHandler) Implements IHttpHandlerFactory.ReleaseHandler
        End Sub

        Public ReadOnly Property IsReusable() As Boolean
            Get
                ' To enable pooling, return true here.
                ' This keeps the handler in memory.
                Return False
            End Get
        End Property
    End Class
End Namespace

通过在 Web.config 中创建项来注册自定义 HttpHandler 工厂，如下所示：

<configuration>
    <system.web>
        <httpHandlers>
            <add verb="GET,POST" path="*.MyFactory"
                 type="Handlers.HandlerFactory, Handlers" />
        </httpHandlers>
    </system.web>
</configuration>