引用http://blogs.msdn.com/dipper/archive/2006/10/05/How-to-Remove-or-hiding-items-in-List-toolbar-in-Sharepoint-Server-2007.aspx
To realize this, you need to override the .ascx based toolbar templates by using a custom template that overrides a toolbar, and thereby customize a toolbar. Please save the following code into nonewbuttonfordoclibtemplates.ascx, and then drop it into C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\CONTROLTEMPLATES and IISRESET, you should be missing the New button on your document library toolbars.
<%@ Control Language="C#" AutoEventWireup="false" %>
<%@Assembly Name="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@Register TagPrefix="SharePoint" Assembly="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" namespace="Microsoft.SharePoint.WebControls"%>
<%@Register TagPrefix="SPHttpUtility" Assembly="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" namespace="Microsoft.SharePoint.Utilities"%>
<%@ Register TagPrefix="wssuc" TagName="ToolBar" src="~/_controltemplates/ToolBar.ascx" %>
<%@ Register TagPrefix="wssuc" TagName="ToolBarButton" src="~/_controltemplates/ToolBarButton.ascx" %>
<SharePoint:RenderingTemplate ID="DocumentLibraryViewToolBar" runat="server">
<Template>
asdfasfasdfasdf
<wssuc:ToolBar CssClass="ms-menutoolbar" EnableViewState="false" id="toolBarTbl" ButtonSeparator="<img src='/_layouts/images/blank.gif' alt=''>" RightButtonSeparator=" " runat="server">
<Template_Buttons>
<SharePoint:ActionsMenu AccessKey="<%$Resources:wss,tb_ActionsMenu_AK%>" runat="server"/>
<SharePoint:SettingsMenu AccessKey="<%$Resources:wss,tb_SettingsMenu_AK%>" runat="server"/>
</Template_Buttons>
<Template_RightButtons>
<SharePoint:PagingButton runat="server"/>
<SharePoint:ListViewSelector runat="server"/>
</Template_RightButtons>
</wssuc:ToolBar>
</Template>
</SharePoint:RenderingTemplate>
还有另外一种简单的方法。用SPD打开页面，然后把webpart展示转化成xslt视图，找到你需要隐藏的item，删除代码即可。不过这种方法无法通用因为并不是webpart。
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