在asp.net中从数据库动态创建菜单和子菜单

我想从数据库中动态显示菜单。但我的菜单项正在显示，但当我过去单击菜单时，子菜单不显示。请告诉我错误在哪里

我的代码是

protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostBack)
    { GetMenuData(); }
}
private void GetMenuData()
{
    DataTable table = new DataTable();
    SqlConnection conn = new SqlConnection(@"Data Source=ST015\SQLEXPRESS;Initial Catalog=MyData;Integrated Security=True");
    string sql = "select menuId,Menuname,MenuDescription,ParentMenuid,MenuUrl from Categories";
    SqlCommand cmd = new SqlCommand(sql, conn);
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    da.Fill(table);
    DataView view = new DataView(table);
    view.RowFilter = "ParentMenuId is NULL";
    foreach (DataRowView row in view)
    {
        MenuItem menuItem = new MenuItem(row["MenuName"].ToString(),
            row["MenuId"].ToString());
        menuItem.NavigateUrl = row["MenuUrl"].ToString();
        Menu1.Items.Add(menuItem);
        AddChildItems(table, menuItem);
    }
}
private void AddChildItems(DataTable table, MenuItem menuItem)
{
    DataView viewItem = new DataView(table);
    viewItem.RowFilter = "ParentMenuId=" + menuItem.Value;
    foreach (DataRowView childView in viewItem)
    {
        MenuItem childItem = new MenuItem(childView["MenuName"].ToString(),
            childView["MenuId"].ToString());
        childItem.NavigateUrl = childView["MenuUrl"].ToString();
        menuItem.ChildItems.Add(childItem);
        AddChildItems(table, childItem);
    }
}

---

您的代码中没有错误。它工作正常。您添加到菜单中的数据可能有错误。可能是“ParentMenuid”丢失或可能有错误

我想当您单击菜单项时，它导致页面

PostBack

，并且您在第一次加载页面时正在创建菜单。因此，您无法在单击菜单项时看到菜单。只需调用

GetMenuData（）IsPostBack

属性的code>方法

protected void Page_Load(object sender, EventArgs e)
{
   GetMenuData(); 
}

---

为菜单的菜单创建一个表

CREATE TABLE [dbo].[tblMenuMaster](
[MenuID] [int] IDENTITY(1,1) NOT NULL,
[MenuName] [varchar](100) NULL,
[DisplayOrder] [int] NULL,
PRIMARY KEY CLUSTERED 
(
[MenuID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

为子菜单的创建另一个表

CREATE TABLE [dbo].[tblSubMenuMaster](
[SubMenuID] [int] IDENTITY(1,1) NOT NULL,
[MenuID] [int] NULL,
[SubMenuName] [varchar](100) NULL,
[MainMenuDisplayOrder] [int] NULL,
[DisplayOrder] [int] NULL,
[SubMenuUrl] [varchar](500) NULL,
[VisibleInMenu] [bit] NULL,
PRIMARY KEY CLUSTERED 
(
[SubMenuID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

现在转到母版页。。 HTML代码是：

   <div class="menubar">
        <%--<ul class="tabs">--%>
        <asp:Literal ID="ltMenus" runat="server"></asp:Literal>
        <%--</ul>--%>
    </div>

//新sp从这里开始

CREATE function [dbo].[Extract_CssNameForMenuByMenuIDAndPageName](@MenuID int, 
PageName varchar(100))
returns nvarchar(50)
as begin      
declare @result nvarchar(50) 
set @result = ''    
IF EXISTS (SELECT pkSitePageId FROM tblsitepages WHERE (MenuID = @MenuID) AND (UPPER(SitePageName) = @PageName)) 
 BEGIN    
  SET @result = 'active'    
 END    
return @result    
end  

//使用的另一个sp是

CREATE function [dbo].[proc_Extract_MenuPageByRoleIDAndMenuID]
(@RoleId int, @MenuID int)
returns nvarchar(500) 
as begin          
declare @result nvarchar(500)
SELECT top 1 @result = s.pagepath FROM tblSitePages AS s INNER JOIN tblSiteRolePermissions AS p ON s.pkSitePageId = p.fkSitePageId
WHERE (p.fkRoleId = @RoleId) AND (s.MenuID = @MenuID)  and p.ViewOnly=1
ORDER BY s.pkSitePageId 
return  @result
end  

这只是一种方法，你可以根据你的要求修改

proc\u Extract\u MenuPageByRoleIDAndMenuIDsp用于获取页面名称及其路径

Extract\u cssnameformenubymenuid和pagenamesp用于将active类设置为第一个li表示第一个菜单。 这将帮助你。。。。。

---

这是工作代码。

您必须删除isPostBack的检查，它将正常工作…我已删除，但仍显示相同的输出您可以运行我粘贴在应答中的代码吗。。我已经在许多项目中实现了这段代码。。您可以试试这个..我无法理解存储过程请正确解释我，直到子菜单未填充。请告诉我为什么它不显示的解决方案

CREATE function [dbo].[Extract_CssNameForMenuByMenuIDAndPageName](@MenuID int, 
PageName varchar(100))
returns nvarchar(50)
as begin      
declare @result nvarchar(50) 
set @result = ''    
IF EXISTS (SELECT pkSitePageId FROM tblsitepages WHERE (MenuID = @MenuID) AND (UPPER(SitePageName) = @PageName)) 
 BEGIN    
  SET @result = 'active'    
 END    
return @result    
end  

CREATE function [dbo].[proc_Extract_MenuPageByRoleIDAndMenuID]
(@RoleId int, @MenuID int)
returns nvarchar(500) 
as begin          
declare @result nvarchar(500)
SELECT top 1 @result = s.pagepath FROM tblSitePages AS s INNER JOIN tblSiteRolePermissions AS p ON s.pkSitePageId = p.fkSitePageId
WHERE (p.fkRoleId = @RoleId) AND (s.MenuID = @MenuID)  and p.ViewOnly=1
ORDER BY s.pkSitePageId 
return  @result
end