今天在用vb生成sharepoint 2010的visual webpart时 碰到一个怪怪的bug.

生成一个新的solution – VB – Sharepoint 2010 – Empty project.

加入一个visual web part. 系统生成以下代码

系统生成以下代码

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>
<%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Register Tagprefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>
<%@ Import Namespace="Microsoft.SharePoint" %>
<%@ Register Tagprefix="WebPartPages" Namespace="Microsoft.SharePoint.WebPartPages" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Control Language="VB" AutoEventWireup="true" CodeBehind="VWPUserControl.ascx.vb" Inherits="VB_Empty.VWPUserControl" %>

加入updatepanel, 新代码如下

<asp:UpdatePanel  runat="server" ID=”Updatepanel1”>

</asp:UpdatePanel>

同时系统报错

{dy}行就报告 “system.web.extensions.updatepanel” is not defined.

有趣的是 删除 ID=”Updatepanel1”, 一切都恢复正常了。太怪了！！！

另外 用C#做同样的事情，就没有问题了。