HTMLEditorExtender 导致“键不能为空”错误答案

【问题标题】：HTMLEditorExtender causing 'Key cannot be null' errorHTMLEditorExtender 导致“键不能为空”错误
【发布时间】：2011-10-19 19:14:43
【问题描述】：

我在 ASP.Net C# 中的项目正在编译和运行良好，但当我尝试加载具有 Ajax Control Toolkit HTMLEditorExtender 的特定页面时除外。我得到一个 Key cannot be null page 错误。我尝试删除 htmleditorextender 并放置一个 asynchfileupload 控件，以确保 scriptmanager 正常工作，并且页面正常运行并且上传控件正常工作。所以它是专门针对 htmleditorextender 的。这是我的代码：

<asp:TextBox ID="txtMailMsgContent" TextMode="MultiLine" runat="server"/>
<cc1:HtmlEditorExtender ID="HTMLEditorExtender" runat="server" 
TargetControlID="txtMailMsgContent">

            <Toolbar> 
                <cc1:Undo />
                <cc1:Redo />
                <cc1:Bold />
                <cc1:Italic />
                <cc1:Underline />
                <cc1:StrikeThrough />
                <cc1:Subscript />
                <cc1:Superscript />
                <cc1:JustifyLeft />
                <cc1:JustifyCenter />
                <cc1:JustifyRight />
                <cc1:JustifyFull />
                <cc1:InsertOrderedList />
                <cc1:InsertUnorderedList />
                <cc1:CreateLink />
                <cc1:UnLink />
                <cc1:RemoveFormat />
                <cc1:SelectAll />
                <cc1:UnSelect />
                <cc1:Delete />
                <cc1:Cut />
                <cc1:Copy />
                <cc1:Paste />
                <cc1:BackgroundColorSelector />
                <cc1:ForeColorSelector />
                <cc1:FontNameSelector />
                <cc1:FontSizeSelector />
                <cc1:Indent />
                <cc1:Outdent />
                <cc1:InsertHorizontalRule />
                <cc1:HorizontalSeparator />
            </Toolbar>
        </cc1:HtmlEditorExtender>

页面错误中显示错误的行是这一行：

   <cc1:HtmlEditorExtender ID="HTMLEditorExtender" runat="server" TargetControlID="txtMailMsgContent">

这是堆栈跟踪：

[ArgumentNullException: Key cannot be null.
Parameter name: key]
   System.Collections.Hashtable.get_Item(Object key) +9355627
   AjaxControlToolkit.Sanitizer.Sanitizer.Initialize() +163
   AjaxControlToolkit.HtmlEditorExtender..ctor() +54
   ASP.mail_emailmessage_aspx.__BuildControlHTMLEditorExtender() in c:\Inetpub\wwwroot\Mail\EMailMessage.aspx:111
   ASP.mail_emailmessage_aspx.__BuildControlformMailMessage() in c:\Inetpub\wwwroot\Mail\EMailMessage.aspx:84
   ASP.mail_emailmessage_aspx.__BuildControlTree(mail_emailmessage_aspx __ctrl) in c:\Inetpub\wwwroot\Mail\EMailMessage.aspx:1
   ASP.mail_emailmessage_aspx.FrameworkInitialize() in c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\26676eb7\92c7e946\App_Web_kemmoois.0.cs:0
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +54
   System.Web.UI.Page.ProcessRequest() +78
   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
   System.Web.UI.Page.ProcessRequest(HttpContext context) +49
   ASP.mail_emailmessage_aspx.ProcessRequest(HttpContext context) in c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\26676eb7\92c7e946\App_Web_kemmoois.0.cs:0
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +100
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

任何帮助将不胜感激。我已尝试在谷歌上搜索此错误，但找不到似乎可行的解决方案。

【问题讨论】：

试试 Bertzzie 在stackoverflow.com/questions/12022493/… 中提供的解决方案。它对我有用。

标签： c# asp.net-ajax ajaxcontroltoolkit html-editor

【解决方案1】：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit.HTMLEditor" TagPrefix="cc1" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
        </asp:ToolkitScriptManager>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>    
        <asp:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="TextBox1">
        </asp:CalendarExtender>
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
        <cc1:Editor ID="Editor1" runat="server" />
        <asp:HtmlEditorExtender ID="HtmlEditorExtender1" runat="server" TargetControlID="TextBox2">
        </asp:HtmlEditorExtender>
        <asp:AnimationExtender ID="AnimationExtender1" runat="server" TargetControlID="TextBox3" >
        </asp:AnimationExtender>
    </div>
    </form>
</body>
</html>

试试这段代码，不要对我之前的 web.config 文件进行任何更改之前得到了同样的异常但是当我尝试这个时它得到了解决了

【讨论】：

【解决方案2】：

我不知道这是否会是您的问题，但是当我在 system.web 中的 web.config 中没有以下部分时遇到了这个问题：

   <sanitizer defaultProvider="AntiXssSanitizerProvider">
       <providers>
           <add name="AntiXssSanitizerProvider" type="AjaxControlToolkit.Sanitizer.AntiXssSanitizerProvider"></add>
       </providers>
   </sanitizer>

您还需要在配置部分中包含此内容：

   <sectionGroup name="system.web">
       <section name="sanitizer" requirePermission="false"
                type="AjaxControlToolkit.Sanitizer.ProviderSanitizerSection, AjaxControlToolkit" />
   </sectionGroup>

【讨论】：

【解决方案3】：

您必须将这些行添加到您的 web.config

配置部分：

<configSections>
   <sectionGroup name="system.web">
      <section name="sanitizer" requirePermission="false" type="AjaxControlToolkit.Sanitizer.ProviderSanitizerSection, AjaxControlToolkit" />
   </sectionGroup>
</configSections>

系统.web

<system.web>
   <sanitizer defaultProvider="AntiXssSanitizerProvider">
    <providers>
      <add name="AntiXssSanitizerProvider"   type="AjaxControlToolkit.Sanitizer.HtmlAgilityPackSanitizerProvider" />
    </providers>
  </sanitizer>

你的烦恼应该会消失，就像它们对我一样。如果有任何帮助，我通过查看对象浏览器找到了解决方案。

【讨论】：