在ASP.NET菜单控件中设置item.selected

我认为您必须在menuitemdatabound事件上设置所选项目(调整代码):

protected void Menu1_MenuItemDataBound(object sender, MenuEventArgs e)
{
    if (SiteMap.CurrentNode != null)
    {
        if (e.Item.Text == SiteMap.CurrentNode.Title)
        {
            e.Item.Selected = true;
        }
    }
}

更多内容,显示如何在具有网站图数据源的菜单中处理链接…

若要在新窗口中打开从web.sitemap生成的菜单链接…

在ASP.NET页中,添加OnMenuItemDataBound事件:

<asp:Menu ID="mnuFooter" runat="server"
DataSourceID="SiteMapDataSource1"
OnMenuItemDataBound="mnuFooter_MenuItemDataBound">
</asp:Menu>

在web.sitemap中,添加?URL的字符:

在代码隐藏中,捕获menuitemdatabound事件:

protected void mnuFooter_MenuItemDataBound(Object sender, MenuEventArgs e)
{
    if (e.Item.NavigateUrl.Contains("?"))
    {
        e.Item.Target = "_blank";
    }
}

web.sitemap中包含的任何URL?将在新窗口中打开。注意,使用任何其他有效的URL字符来代替?如有必要。

ASP.NET Menu Control Overview

好吧,这就是我的结局。(谢谢,莱尼尔,你指点了我的方向。) 以下代码位于包含菜单控件的主文件后面的代码中。 代码中的注释显示了我的惊讶,这个控件不允许一次选择多个项。所以,在一个多级菜单中,我不能同时显示当前节点和它的父节点。(除非我错过了什么。)

// This is where we set the current node's ROOT menu item's selected property to
    // true.  The current node won't show as selected, but it's parent will be.
    // As explained elsewhere, this was a UI decision based on the fact that the menu 
    // can only have one menu item selected at a time.
    // If the menu wasn't dataBound, this code would be in Page_Load.
    protected void SideMenu_DataBound1(object sender, EventArgs e)
    {           
        Menu menu = (Menu)this.FindControl("SideMenu");    // Get Menu Object

        string parent = null;

        // First check that there's a current node - there wont be one if the user
        // accesses this page from a bookmark.
        if (SiteMap.CurrentNode != null)
        {
            // Check if the current place in the SiteMap is in the first level of the menu
            // or a child menu item. 
            if (SiteMap.CurrentNode.ParentNode.ParentNode != null)
                parent = SiteMap.CurrentNode.ParentNode.Description;  // It's a child - has a parent

            if (parent == null)  // a parent node
            {
                MenuItem item = menu.FindItem(SiteMap.CurrentNode.Description);
                item.Selected = true;
            }
            else   // a child menu item
            {
                // Get it's parent node and set it's selected property to true.
                MenuItem item = menu.FindItem(parent);
                item.Selected = true;
                // Following comments left in to show how to get at
                // a menu item that's not in the first level.  The trick is the
                // "/" separator, which is the pathSeparator property of the menu
                // control.

                //  The menu control
                // only allows one item to be selected at a time.  This is true, even though
                // the MenuItem class has a selected property, which implies each item 
                // can have a selected property but it's not the case.
                //path = parent + "/" + current;
                //MenuItem item2 = menu.FindItem(path);
                //item2.Selected = true;
            }
        }
    }

如果web.sitemap文件包含外部链接(指向其他域的链接),则这些链接将需要以http://或https://开头,但本地文件引用不会-它们只是来自加载文档的当前位置的相对引用。

因此,当您需要的字符已经存在时(HTTP或HTTPS),不需要用额外的字符填充URL。

protected void mnuFooter_MenuItemDataBound(Object sender, MenuEventArgs e) 
{ 
    string theURL = e.Item.NavigateUrl;
    if (theURL.Contains("http://") || theURL.Contains("https://")) 
    { 
        e.Item.Target = "_blank"; 
    } 
} 

如果要在新窗口中打开本地文件,只需将URL从本地引用更改为完整的URL(加载该文件需要稍长时间,因为必须解析该URL)。