母版页如何隐藏主页的div特别是webform ASP.NET C＃错误 [英] Master page how to hide div of master page in particular webform ASP.NET C# error

问题描述

Header.master --->页

 <   asp：ContentPlaceHolder     ID   =  cntplcDiv    runat   =  server < span class =code-attribute> 
   
  < div     runat   =  server    id   =  divCmptMenu >  
 <   ul     id   =  nav >  
 <   li  >  <   asp：HyperLink    < span class =code-attribute> ID   =  hypLnkhome    runat   =  server    NavigateUrl   = 〜/ Admin_Home.aspx > 主页<   / asp：HyperLink  >  <   / li  >  
 <   li  >  < span class =code-keyword><   asp：HyperLink     ID   =  hypLnkconfigSettng    runat   =  server    > 配置&设置<   / asp：HyperLink  >  
 <   ul     class   =  subs >  
 <   li  >  <   asp：HyperLink     ID   =  hypLnkUsrStng    runat   =  server    NavigateUrl   = 〜/ ListUsers.aspx > 用户设置<   / asp：HyperLink  >  <   / li  >  
 <   li  >  <   asp：HyperLink     ID   =  hypLnkprdStng    runat   =  se rver   文字  = 生产设置 >  <   / asp：HyperLink  >  <   / li  >  
 <   li  >  <  < span class =code-leadattribute> asp：HyperLink     ID   =  HyperLink1    runat   =  server   >  <   / asp：HyperLink  >  <   / li  >  
  <   li  >  <   asp：HyperLink     ID  < span class =code-keyword> =  hypLnkEmailTmp    runat   =  server   > 电子邮件模板<   / asp：HyperLink  >  <   / li  >  
 <   li  >  <   asp：HyperLink     ID   =  HyperLink4    runat   =  server < span class =code-attribute>  >  <   / asp：HyperLink  >  <   / li  >  
 <   li  >  <   asp：HyperLink     ID   =  hypLnkTaxSttng    runat   =  server   文字  =  Tax Settings    NavigateUrl   = 〜/ TaxSetting.aspx   >  <   / asp：HyperLink  >  <   / li  >  
 <   li  >  <   asp：HyperLink     ID   =   HyperLink5     < span class =code-attribute> runat   =  server   >  <   / asp：HyperLink  >  <   / li  >  
 <   / ul  >  
 <   / li  >  
 < span class =code-keyword><   / div  >  
 
 <   asp：ContentPlaceHolder  >  

Header.master.cs

  protected   void  Page_Load（ o bject  sender，EventArgs e）
 {
 
 CheckForEstPage（）; 
 
} 
 
  public   void  CheckForEstPage（） 
 {
  try  
 {
  String  path = HttpContext.Current.Request.Url.AbsolutePath; 
 System.Web.UI.HtmlControls.HtmlGenericControl currdiv =（System.Web.UI.HtmlControls.HtmlGenericControl）Master.FindControl（  divCmptMenu）; 
 
  if （path ==  〜/ EstimateForms.aspx）
 {
 currdiv.Style.Add（  display，  none）; 
  //   currdiv.Visible = false;  
} 
 
} 
  catch （Exception expM）
 {
 Response.Write（expM.Message）; 
} 
} 

plz帮我编写我想要的编码隐藏特定网页中的母版div（例如，估计形式）...我已经尝试了很多编码...我收到错误

对象引用未设置为对象的实例

谢谢你...



我尝试过的事情：



???

解决方案

你可以试试这个



这个.Page.Master.FindControl（具有runat = server的控件的ID）

从内容页面中找到一个主页面控件，如下所示： -

 //你的div应该包含属性
 runat =server
 
 //找到与id 
相关联的div System.Web.UI.HtmlControls.HtmlGenericControl currdiv =（System.Web.UI.HtmlControls.HtmlGenericControl）Master.FindControl（divid）; 
 
 //隐藏div 
 currdiv.Style.Add（display，none）; 

或试试这个： -

 HtmlGenericControl Divid =（HtmlGenericControl）Page.Master。的FindControl（ MainDiv）的FindControl（ DIVID）; 
 Divid.Visible = false; 

[ ^ ]



http：// www。 w3schools.com/aspnet/aspnet_masterpages.asp [ ^

Header.master--->page

<asp:ContentPlaceHolder ID="cntplcDiv" runat="server"

<div runat="server" id="divCmptMenu">
    <ul id="nav">
                <li><asp:HyperLink ID="hypLnkhome" runat="server" NavigateUrl="~/Admin_Home.aspx">Home</asp:HyperLink></li>
                <li><asp:HyperLink ID="hypLnkconfigSettng" runat="server" >Config & Settings</asp:HyperLink>
                    <ul class="subs">
                        <li><asp:HyperLink ID="hypLnkUsrStng" runat="server" NavigateUrl="~/ListUsers.aspx">User Settings</asp:HyperLink></li>
                        <li><asp:HyperLink ID="hypLnkprdStng" runat="server" Text="Production Settings"></asp:HyperLink></li>
                        <li><asp:HyperLink ID="HyperLink1" runat="server" ></asp:HyperLink></li>
                        <li><asp:HyperLink ID="hypLnkEmailTmp" runat="server" >Email Templates</asp:HyperLink></li>
                        <li><asp:HyperLink ID="HyperLink4" runat="server" ></asp:HyperLink></li>
                        <li><asp:HyperLink ID="hypLnkTaxSttng" runat="server" Text="Tax Settings" NavigateUrl="~/TaxSetting.aspx" ></asp:HyperLink></li>
                        <li><asp:HyperLink ID="HyperLink5"  runat="server" ></asp:HyperLink></li>
                    </ul>
                </li>
 </div>
  
<asp:ContentPlaceHolder>

Header.master.cs

protected void Page_Load(object sender, EventArgs e)
    {

CheckForEstPage();

}

    public void CheckForEstPage()
    {
        try
        {
            String path = HttpContext.Current.Request.Url.AbsolutePath;
            System.Web.UI.HtmlControls.HtmlGenericControl currdiv = (System.Web.UI.HtmlControls.HtmlGenericControl)Master.FindControl("divCmptMenu");

            if (path == "~/EstimateForms.aspx")
            {
                currdiv.Style.Add("display", "none");
                // currdiv.Visible = false;
            }

        }
        catch (Exception expM)
        {
            Response.Write(expM.Message);
        }
    }

plz help me with the coding i want to hide the masterpage div in particular webpage(for in ex. estimateform)... i have tried a lot of coding... i am getting error
"Object reference not set to an instance of an object. "
thank u...

What I have tried:

???

解决方案

You can try this

this.Page.Master.FindControl("Id of control that have runat=server")

find a master page control from content page like this:-

//your div should contain the property
 runat="server"
 
//finding the div associated with id 
System.Web.UI.HtmlControls.HtmlGenericControl currdiv = (System.Web.UI.HtmlControls.HtmlGenericControl)Master.FindControl("divid");
 
//hiding the div
 currdiv.Style.Add("display", "none");

or try this:-

HtmlGenericControl Divid = (HtmlGenericControl)Page.Master.FindControl("MainDiv").FindControl("Divid");
 Divid.Visible = false;

[^]

http://www.w3schools.com/aspnet/aspnet_masterpages.asp[^]

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