命名空间“System.Web.UI.WebControls”中不存在类型或命名空间名称“ToolkitScriptManager”答案

【问题标题】：The type or namespace name 'ToolkitScriptManager' does not exist in the namespace 'System.Web.UI.WebControls'命名空间“System.Web.UI.WebControls”中不存在类型或命名空间名称“ToolkitScriptManager”
【发布时间】：2015-03-25 18:07:26
【问题描述】：

我收到以下错误

  The type or namespace name 'ToolkitScriptManager' does not exist in the namespace 'System.Web.UI.WebControls' (are you missing an assembly reference?)  
  The type or namespace name 'ModalPopupExtender' does not exist in the namespace 'System.Web.UI.WebControls' (are you missing an assembly reference?)  
  The type or namespace name 'Accordion' does not exist in the namespace 'System.Web.UI.WebControls' (are you missing an assembly reference?)

我已经安装了 ajaxControlToolKit，我的 web.config 文件中有这个

<pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"><controls>
    <add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
  </controls></pages>

我的 .aspx 页面

 <%@ Page Language="C#" AutoEventWireup="true"       CodeBehind="PaintBrushCanvas.aspx.cs" Inherits="VirtualClassroom.PaintBrushCanvas" %>
 <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>
 <!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Paint Brush</title>
 <style type="text/css">
  #container { position: relative; overflow: auto; scrollbar-base-color:#ffeaff;  }
  #imageView { border: 1px dashed #CCCCCC; margin: 5px; border-style: dotted; border-width: 1px; background-color: #FFFFFF; vertical-align: top;  }
  #imageTemp { position: absolute; top: 1px; left: 1px; margin: 5px; }
  #imageTempt { position: absolute; top: 1px; left: 1px; margin: 5px; }
</style>
<link href="../StyleSheet.css" rel="stylesheet" type="text/css" />   
<script type="text/javascript" src="CanvasUtils.js"></script>

 <script type="text/javascript">
    window.moveTo(0, 0);
    window.resizeTo(screen.width, screen.height);
 </script>
</head>

<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" EnablePageMethods="true">
</asp:ToolkitScriptManager>
<asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" BehaviorID="MPBehaviorIDOpen" 
    TargetControlID="btnPopupRender" PopupControlID="panelOpen" BackgroundCssClass="modalBackground"
    PopupDragHandleControlID="panelOpenHead" OkControlID="btnOKOpen" CancelControlID="btnCancelOpen" /> 
<asp:ModalPopupExtender ID="ModalPopupExtender2" runat="server" BehaviorID="MPBehaviorIDResize" 
    TargetControlID="btnPopupRender" PopupControlID="panelPageSize" BackgroundCssClass="modalBackground"
    PopupDragHandleControlID="panelPageSizeHead" OkControlID="btnPageSizeOK" CancelControlID="btnPageSizeCancel" /> 

<div>
    <asp:Button id="btnPopupRender" Height="0px" Width="0px" runat="server" style="display:none;" />
</div>
<table style="height: 100%; vertical-align: top; width: 100%;">
    <tr>
        <td style="height: 100%; vertical-align: top;">
            <asp:Accordion ID="MyAccordion" runat="server" SelectedIndex="0" 
                                HeaderCssClass="accordionHeader" ContentCssClass="accordionContent" 
                                FadeTransitions="true" FramesPerSecond="40" TransitionDuration="250"
                                AutoSize="None" CssClass="accordionStyle" Width="140">
             <Panes>
                <asp:AccordionPane ID="AccordionPane1" runat="server">
                  <Header>Toolbox</Header>
                  <Content>
                    <asp:ImageButton ID="btnOpen" runat="server"  Width="40px" Height="40px"
                                   OnClientClick="ShowPopup(event,'MPBehaviorIDOpen'); return false;" ImageUrl="~/Images/open.png" /><br />
                    <asp:Label ID="Label1" runat="server" Text="Open"></asp:Label><br /> <br />
                    <asp:ImageButton ID="btnPageSize" runat="server"  Width="40px" Height="40px"
                                   OnClientClick="ShowPopup(event,'MPBehaviorIDResize'); return false;" ImageUrl="~/Images/paperSettings.png" /><br />
                    <asp:Label ID="Label5" runat="server" Text="Page Size"></asp:Label><br /> <br />
                    <asp:ImageButton ID="btnDraw" runat="server"  Width="40px" Height="40px" 
                                   OnClientClick="SelectTool('pencil'); return false;" ImageUrl="~/Images/draw.png" /><br />
                    <asp:Label runat="server" Text="Draw"></asp:Label><br /><br />
                    <asp:ImageButton ID="btnText" runat="server" Width="40px" Height="40px" 
                                   OnClientClick="SelectTool('text'); return false;" ImageUrl="~/Images/text.png" /><br />
                    <asp:Label ID="Label2" runat="server" Text="Text"></asp:Label><br /><br />
                    <asp:ImageButton ID="btnLine" runat="server" Width="40px" Height="40px" 
                                   OnClientClick="SelectTool('line'); return false;" ImageUrl="~/Images/line.png" /><br />
                    <asp:Label runat="server" Text="Line"></asp:Label><br /><br />
                    <asp:ImageButton ID="btnSquare" runat="server" Width="40px" Height="40px" 
                                   OnClientClick="SelectTool('rect'); return false;" ImageUrl="~/Images/square.png" /><br />
                    <asp:Label runat="server" Text="Square"></asp:Label><br /><br />
                    <asp:ImageButton ID="btnSave" runat="server" Width="40px" Height="40px" 
                                    OnClientClick="SaveDrawings();return false;"  ImageUrl="~/Images/save.png" /><br />
                    <asp:Label ID="Label11" runat="server" Text="Save"></asp:Label><br /><br />
                    <asp:ImageButton ID="btnExit" runat="server" Width="40px" Height="40px" 
                                    OnClientClick="Exit();return false;"  ImageUrl="~/Images/exit.png" /><br />
                    <asp:Label ID="Label3" runat="server" Text="Exit"></asp:Label><br /><br />
                  </Content>
                </asp:AccordionPane>
             </Panes>
            </asp:Accordion>
        </td>
        <td style="height: 100%; vertical-align: top; ">
            <div id="container">
                <canvas id="imageView"></canvas> 
            </div>
        </td>
    </tr>
</table>

<div id="panelOpen" class="modalPopup" style="display:none;">
    <div id="panelOpenHead" class="popupHeader">
        <p>Choose File</p>
    </div>
    <div style="text-align:center;">
        <p>
            <input id="fileUploadImg" type="file" accept="image/*"  />
        </p>
        <p>
            <input type="button" id="btnOKOpen" value="OK" onclick="UpdateCanvas(); return false;" />
            <input type="button" id="btnCancelOpen" value="Cancel" />
        </p>
    </div>
</div>

<div id="panelPageSize" class="modalPopup" style="display:none;">
    <div id="panelPageSizeHead" class="popupHeader">
        <p>Page Size</p>
    </div>
    <div style="text-align:center;">
        <p>
            Enter Width: <input type="text" id="txtWidth" style="width:100px;" /> px
        </p>
        <p>
            Enter Height: <input type="text" id="txtHeight" style="width:100px;" /> px
        </p>
        <p>
            <input type="button" id="btnPageSizeOK" value="OK" onclick="Resize(); return false;" />
            <input type="button" id="btnPageSizeCancel" value="Cancel" />
        </p>
    </div>
</div>

</form>
 </body>
</html>

这是我的 web.config 文件

  <?xml version="1.0" encoding="utf-8"?>
 <!--
 For more information on how to configure your ASP.NET application, please    visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>
  <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>
<connectionStrings>
  <add name="DBCS" connectionString="data source=.; database=xxx; integrated    security=SSPI" providerName="System.Data.SqlClient" />
 </connectionStrings>


 <system.web>
   <compilation debug="true" targetFramework="4.5" />
    <authentication mode="Forms">
    <forms loginUrl="SelectUser.aspx" defaultUrl="SelectUser.aspx" />
    </authentication>
    <authorization>
    <deny users="?" />
   </authorization>
    <membership>
     <providers>
       <clear />
       <add name="AspNetSqlMembershipProvider"    type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />
    </providers>
   </membership>
   <profile>
    <providers>
    <clear />
     <add name="AspNetSqlProfileProvider"   type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/" />
  </providers>
  </profile>
  <roleManager enabled="false">
    <providers>
     <clear />
      <add name="AspNetSqlRoleProvider"   type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />
    <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />
  </providers>
</roleManager>
  <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"><controls>
      <add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
     <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    </controls></pages>
  </system.web>
     <system.webServer>
        <modules runAllManagedModulesForAllRequests="true" />
       </system.webServer>
        <assemblies>

       <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral,      PublicKeyToken=B77A5C561934E089"/>

       <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>

         <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

      <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
     </assemblies>
      <runtime>
        <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <dependentAssembly>
         <assemblyIdentity name="Microsoft.Owin"        publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
    </dependentAssembly>
   <dependentAssembly>
     <assemblyIdentity name="Microsoft.Owin.Security" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
     </dependentAssembly>
       <dependentAssembly>
      <assemblyIdentity name="Microsoft.WindowsAzure.Storage" publicKeyToken="31bf3856ad364e35" culture="neutral" />
      <bindingRedirect oldVersion="0.0.0.0-2.1.0.4" newVersion="2.1.0.4" />
    </dependentAssembly>
    <dependentAssembly>
    <assemblyIdentity name="HtmlAgilityPack" publicKeyToken="bd319b19eaf3b43a" culture="neutral" />
     <bindingRedirect oldVersion="0.0.0.0-1.4.9.0" newVersion="1.4.9.0" />
     </dependentAssembly>
    </assemblyBinding>
        </runtime>
   </configuration>

我已经努力摆脱这个错误，但我不能。请帮助。提前致谢！！

【问题讨论】：

标签： asp.net ajax ajaxcontroltoolkit .net-assembly

【解决方案2】：

存在于命名空间 System.Web.UI.WebControls；

但要使用它，您必须安装 AJAX 工具包。

在使用 AJAX 工具包中的控件之前，您必须重新注册工具包脚本管理器。

<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %>

你可以再做一件事。

1.从工具箱中删除Ajax Control选项卡。

2.重新添加选项卡并右键单击选项卡，选择Choose Items并浏览到您自己项目中的AjaxControltoolkit.dll文件并按OK（确保您使用与相同版本的ajax工具包您的 C# 版本）。

3.清理并重建解决方案，您就可以开始了。

将这些程序集添加到您的 web.config

    <assemblies>

            <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

            <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>

            <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

            <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

</assemblies>

并将您的 tagfix 更改为 asp 而不是 ajaxToolkit。

我想它会对你有所帮助。

【讨论】：

我已经安装了 AJAXControlToolkit 并且没有单独的 AJAXToolkit 包。我现在必须做什么？@SHIVANG RANA
如果您已经安装了工具包，那么它必须能够正常工作。有没有注册工具包脚本管理器
不，它不会给我同样的错误。看看我在哪里显示了我的 web.config 的问题。我也注册了
您必须在您使用 AJAX 控件的特定页面中注册脚本管理器。
我可以包含在 web.config 中吗？如果可以，我该怎么做？