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ASP.NET 通用处理程序在 .NET 3.5 到 .NET 4.0 升级后未被调用

转载 作者：行者123 更新时间：2023-12-04 04:48:40 26 4
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这个旧标题描述了可见的问题，但新标题更好地描述了根本原因问题。我仍然不确定为什么 ASHX 没有被调用，所以我仍在寻找答案。我现在通过硬编码 API 描述符(Ext.app.REMOTING_API 变量)有一个解决方法。我从运行 .NET 3.5 的原始代码中，从 DirectProxy“provider”返回的变量中得到了那个 JSON 对象(Ext.app.REMOTING_API 变量)。我只是使用了一个在线 JavaScript 美化器让它看起来很漂亮(这样你就可以阅读它，而不是在一行上)。

旧标题:ExtJS 3 Ext.Direct proxy error: Uncaught TypeError: Cannot read property 'events' of undefined
我刚刚将 extdirect4dotnet 项目从 .NET 3.5 升级到 .NET 4.0。可以在此处找到该项目和示例项目 https://code.google.com/p/extdirect4dotnet/ .当我这样做时，我不得不在更改项目版本时临时复制 Web.Config 文件。我修复了由于继承 JSON.NET 中的类而导致的两个覆盖方法的参数列表，该类位于 http://json.codeplex.com/SourceControl/latest#readme.txt .我还修复了两个项目中 DLL 引用的方式。然后我将 Web.Config 中所有出现的“3.5”替换为“4.0”。

不幸的是，该项目使用 ExtJs 3.0.0，而不是 ExtJs 4.2.*，这是我正在使用此 .NET 服务器端堆栈 (extdirect4dotnet) 实现 Ext.Direct 代理的框架版本。所以它仍然使用一些旧的语法。下面我试图找出在 .NET 升级后如何修复特定错误。它仍在使用 ExtJs 3.0.0。请参阅“addProvider”函数中的“see this line”以查看它失败的行。当我从 JavaScript 调试它时，“provider”是未定义的。我猜它不知道如何获取提供者 Ext.app.REMOTING_API在我将其升级到 .NET 4.0 之后。

JavaScript 错误:

Uncaught TypeError: Cannot read property 'events' of undefined

ExtJs 代码: 
/*!
 * Ext JS Library 3.0.0
 * Copyright(c) 2006-2009 Ext JS, LLC
 * licensing@extjs.com
 * http://www.extjs.com/license
 */

... 
 * </code></pre>
 * @param {Object/Array} provider Accepts either an Array of Provider descriptions (an instance
 * or config object for a Provider) or any number of Provider descriptions as arguments.  Each
 * Provider description instructs Ext.Direct how to create client-side stub methods.
 */
addProvider : function(provider){        
    var a = arguments;
    if(a.length > 1){
        for(var i = 0, len = a.length; i < len; i++){
            this.addProvider(a[i]);
        }
        return;
    }

    // if provider has not already been instantiated
    if(!provider.events){  // <========================= see this line
        provider = new Ext.Direct.PROVIDERS[provider.type](provider);
    }
    provider.id = provider.id || Ext.id();
    this.providers[provider.id] = provider;

    provider.on('data', this.onProviderData, this);
    provider.on('exception', this.onProviderException, this);


    if(!provider.isConnected()){
        provider.connect();
    }

    return provider;
},

示例项目 JavaScript 代码: 
Ext.Direct.addProvider(Ext.app.REMOTING_API);

带有 .NET 3.5 实现的“提供者”对象上的 JavaScript 调试器的屏幕截图(在 .NET 升级之前)

(在新窗口中打开以查看大图)

enter image description here

作为一种解决方法，我对我的 js 文件执行了以下操作并对提供程序(Ext.app.REMOTING_API 变量)进行了硬编码。这本质上是一个 JSON 对象，它是我的 API 描述符。当示例项目使用 .NET 3.5 配置时，我从下面继承的 ASHX 代码中捕获了变量“provider”。出于某种奇怪的原因，我在 ASP.NET 中的通用处理程序没有被调用。 Generic Handler 继承的类对我来说似乎是普通的 .NET 4.0 Generic Handler (ASHX) 代码。我在下面粘贴了 HTML、ASHX 和继承的 ASHX。 
Ext.onReady(function () {

    Ext.app.REMOTING_API = {
        "type": "remoting",
        "id": "1",
        "url": "../directRouter.ashx",
        "actions": {
            "CallTypes": [{
                "name": "Echo",
                "len": 1,
                "formHandler": false
            }, {
                "name": "GetTime",
                "len": 0,
                "formHandler": false
            }, {
                "name": "UploadHttpRequestParam",
                "len": 1,
                "formHandler": true
            }, {
                "name": "UploadNamedParameter",
                "len": 1,
                "formHandler": true
            }, {
                "name": "SaveMethod",
                "len": 3,
                "formHandler": false
            }, {
                "name": "SaveMethod_Form",
                "len": 1,
                "formHandler": true
            }, {
                "name": "DateSample",
                "len": 2,
                "formHandler": false
            }],
            "TreeAction": [{
                "name": "getChildNodes",
                "len": 2,
                "formHandler": false
            }],
            "CRUDSampleMethods": [{
                "name": "create",
                "len": 1,
                "formHandler": false
            }, {
                "name": "read",
                "len": 1,
                "formHandler": false
            }, {
                "name": "update",
                "len": 2,
                "formHandler": false
            }, {
                "name": "destroy",
                "len": 1,
                "formHandler": false
            }, {
                "name": "reset",
                "len": 0,
                "formHandler": false
            }]
        }
    };


    Ext.Direct.addProvider(Ext.app.REMOTING_API);
    //Ext.Direct.addProvider();

    var Employee = Ext.data.Record.create([
        { name: 'firstname' },                  // map the Record's "firstname" field to the row object's key of the same name
        {name: 'job', mapping: 'occupation'}  // map the Record's "job" field to the row object's "occupation" key
    ]);

    var reader = new Ext.data.JsonReader({
        totalProperty: 'results',
        successProperty: 'success',
        idProperty: 'id',
        root: 'data'
    }, [
            { name: 'id' },
            { name: 'email', allowBlank: false },
            { name: 'first', allowBlank: false },
            { name: 'last', allowBlank: false }
        ]
    );
    var writer = new Ext.data.JsonWriter({
        returnJson: false,
        writeAllFields: true
    });

    var store = new Ext.data.DirectStore({
        api: {
            read: CRUDSampleMethods.read,
            create: CRUDSampleMethods.create,
            update: CRUDSampleMethods.update,
            destroy: CRUDSampleMethods.destroy
        },
        reader: reader,
        baseParams: { dummy: 'blubb' },
        writer: writer,     // <-- plug a DataWriter into the store just as you would a Reader
        paramsAsHash: true,
        batchSave: false,
        batch: false,
        prettyUrls: false,
        remoteSort: true,
        listeners: {
            load: function (result) {
            },
            loadexception: function () {

            },
            scope: this
        }
    });
    //

    var myPageSize = 10;

    var userColumns = [
        { header: "ID", width: 40, sortable: true, dataIndex: 'id' },
        { header: "Email", width: 100, sortable: true, dataIndex: 'email', editor: new Ext.form.TextField({}) },
        { header: "First", width: 50, sortable: true, dataIndex: 'first', editor: new Ext.form.TextField({}) },
        { header: "Last", width: 50, sortable: true, dataIndex: 'last', editor: new Ext.form.TextField({}) }
    ];
    Ext.onReady(function () {
        Ext.QuickTips.init();

        var userForm = new App.user.Form({
            renderTo: 'user-form',
            listeners: {
                create: function (fpanel, data) {   // <-- custom "create" event defined in App.user.Form class
                    var rec = new userGrid.store.recordType(data);
                    userGrid.store.insert(0, rec);
                }
            }
        });

        // create user.Grid instance (@see UserGrid.js)
        var userGrid = new App.user.Grid({
            renderTo: 'user-grid',
            store: store,
            columns: userColumns,
            bbar: new Ext.PagingToolbar({
                store: store,       // grid and PagingToolbar using same store
                displayInfo: true,
                pageSize: myPageSize,
                prependButtons: true,
                items: [
                    'text 1'
                ]
            }),
            listeners: {
                rowclick: function (g, index, ev) {
                    var rec = g.store.getAt(index);
                    userForm.loadRecord(rec);
                },
                destroy: function () {
                    userForm.getForm().reset();
                }
            }
        });
        setTimeout(function () {
            Ext.get('loading').remove();
            Ext.fly('loading-mask').fadeOut({
                remove: true
            });
            store.load({ params: {
                start: 0,          // specify params for the first page load if using paging
                limit: myPageSize,
                foo: 'bar'
            }
            });

        }, 250);
    });

});   // onready

HTML 代码:

... 
<link rel="stylesheet" type="text/css" href="../ext/resources/css/ext-all.css" />    
<script type="text/javascript" src="../ext/ext-base-debug.js"></script>     
<script type="text/javascript" src="../ext/ext-all-debug.js"></script>
<!-- directProxy.rfc was registred in the web.config -->
<script type="text/javascript" src="../directProxy.ashx"></script>

...

ASHX:

使用系统； 
using System.Collections;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
using ExtDirect4DotNet;

namespace WebApplication1
{
   /// <summary>
    /// Zusammenfassungsbeschreibung für $codebehindclassname$
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class directProxy : DirectProxy
    {
        public directProxy()
        {
            DirectProxy.routerUrl = "../directRouter.ashx";
        }

    }
}

在 ExtDirect4DotNet 中发现的继承 ASHX(在 .NET 4.0 升级期间代码没有改变): 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Configuration;
using System.Web.Configuration;
using ExtDirect4DotNet;
using ExtDirect4DotNet.helper;

namespace ExtDirect4DotNet
{
    /// <summary>
    /// Represents the Proxy For Ext.Direct Comunication.
    /// Tha ProccessRequest Methode scanns all the available Assembly for Classes and Methods with the 
    /// Direct Attribute.
    /// </summary>
    public class DirectProxy : IHttpHandler
    {
        private static string url = "";
        public static string routerUrl {
            get { return url; }
            set { url = value; }
        }

        public static DirectProvider getDirectProviderCache(string apiNameSpace)
        {

            string routerUrl = (DirectProxy.routerUrl == "") ? ConfigurationCache.getRouterUrl() : DirectProxy.routerUrl;

            // set default namspace for the remoting API
            string apiNamespace = (apiNameSpace == null || apiNameSpace == "") ? "Ext.app.REMOTING_API" : apiNameSpace;


            DirectProviderCache cache = DirectProviderCache.GetInstance();
            DirectProvider provider;

            //After being configured, the provider should be cached.
            if (!cache.ContainsKey(apiNamespace + "/" + routerUrl))
            {
                provider = new DirectProvider(apiNamespace, routerUrl);
                provider.Configure(AppDomain.CurrentDomain.GetAssemblies());
                if (!cache.ContainsKey(apiNamespace + "/" + routerUrl))
                    cache.Add(apiNamespace + "/" + routerUrl, provider);
            }
            else
            {
                provider = cache[apiNamespace + "/" + routerUrl];
            }
            return provider;
        }

        public void ProcessRequest(HttpContext context)
        {


            // set default namspace for the remoting API
            string apiNamespace = "Ext.app.REMOTING_API";
            if (context.Request.Form["ns"] != null)
            {
                // if there is an namespace parameter, use it...
                apiNamespace = context.Request.Form["ns"].ToString();
            }
            DirectProvider provider = getDirectProviderCache(apiNamespace);

            context.Response.Write(provider.ToString());

            /*
            old code..


            // set the Response typ to javascript since the responce gets Parsed into an Script Tag
            context.Response.ContentType = "text/JavaScript";

            string rem = "{";
            rem += "url: \""+routerUrl+"\",";
            rem += "type:\"remoting\",";


            //string json = DirectProxyGenerator.generateDirectApi();
           //rem += json;
            rem += "};";

            rem = apiNamespace + ".REMOTING_API =" + rem;
            rem = "(function(){" + rem + "})();";

            context.Response.Write(rem);
           */
        }

        public bool IsReusable
        {
            get { return false; }
        }
    }
}

最佳答案

在 IIS 7 中重现问题后，最终为 IIS 6 和 IIS 7 解决了这个问题!!

HTTP 处理程序在带有 .NET 3.5 和 .NET 4.0 的 IIS 6 上工作。但是，当您将框架升级到 .NET 4.0 时，IIS 7 上的 HTTP 处理程序会中断。为了修复，您必须做 4 件事。

1.) 将应用程序池 .NET 版本从 v2.0 更改为 v4.0

2.) 将应用程序池从集成更改为经典

3.) 将应用程序池从 64 位更改为 32 位

4.) 替换 Web.Config 中的 XML 标记。如果不这样做并且将这些行的“3.5.0.0”版本替换为“4.0.0.0”，则可能会损坏 IIS 并引发此错误。

Configuration file is not well-formed XML #2

.NET 3.5 版 Web.Config 配置:

(注意“PublicKeyToken”属性值中的小写字母与大写字母)

  <!--<configSections>
    <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
      <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
        <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
        <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
          <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/>
          <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
          <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
          <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
        </sectionGroup>
      </sectionGroup>
    </sectionGroup>
  </configSections>-->

.NET 4.0 版 Web.Config 配置: 
  <configSections>
    <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
      <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
        <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
        <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions,  Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
          <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="Everywhere"/>
          <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
          <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
          <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
        </sectionGroup>
      </sectionGroup>
    </sectionGroup>
  </configSections>

相关:

https://serverfault.com/questions/525443/how-to-uninstall-iis-from-windows-server-2008/525496#525496

Configuration file is not well-formed XML #2

关于ASP.NET 通用处理程序在 .NET 3.5 到 .NET 4.0 升级后未被调用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17779128/

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