思路:母版頁隱藏控件 從内容頁接收值 JS根據接受的值控制菜單項的現實
母版頁:
隱藏控件:
  <asp:Label ID="Lbl_X" runat="server" Text="text" style="display:none"></asp:Label>
<asp:Label ID="Lbl_Xn" runat="server" Text="text" style="display:none"></asp:Label>

JS:
  <%-- 設置選中--%>
    <script type="text/javascript">
        var X = document.getElementById('<%=this.Lbl_X.ClientID %>').innerText;
       
var Xn = document.getElementById('<%=this.Lbl_Xn.ClientID %>').innerText;
       
var div = document.getElementById(X);
       
if (div != null) {
            div.setAttribute(
"class", 'nav-top-item current');
        }
       
var div2 = document.getElementById(Xn);
       
if (div != null) {
            div2.setAttribute(
"class", 'current');
        }
   
</script>
内容頁給母版頁隱藏空間賦值:
  //設置母版頁Lable的值,以控制菜單項CSS    
            Label X = (Label)this.Master.FindControl("Lbl_X");
            X.Text = "A";
            Label Xn = (Label)this.Master.FindControl("Lbl_Xn");
            Xn.Text = "A1";

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