asp.net webform 의 child page 에서 master page 에 접근하여 metadata tag 값 추가하는 방법.

C# Adding MetaData to Master page from Child page dynamically

asp.net webform 의 child page 에서 master page 에 접근하여 metadata tag 값 추가하는 방법.

Masterpage.master.cs

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
 
public partial class MasterPage : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
 
    protected override void OnPreRender(EventArgs e)
    {
        if (Description != null)
        {
            HtmlMeta metaD = new HtmlMeta();
            metaD.Name = "description";
            metaD.Content = Description;
            this.Page.Header.Controls.Add(metaD);
        }
        if (Keywords != null)
        {
            HtmlMeta metaK = new HtmlMeta();
            metaK.Name = "description";
            metaK.Content = Keywords;
            this.Page.Header.Controls.Add(metaK);
        }
        base.OnPreRender(e);
    }
    public string Description
    {
        get
        {
            if (ViewState["MetaDescription"] != null)
                return (string)ViewState["MetaDescription"];
            else
                return null;
        }
        set
        {
            ViewState["MetaDescription"] = value;
        }
    }
    public string Keywords
    {
        get
        {
            if (ViewState["MetaKeywords"] != null)
                return (string)ViewState["MetaKeywords"];
            else
                return null;
        }
        set
        {
            ViewState["MetaKeywords"] = value;
        }
    }
}

child page

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        (Master as MasterPage).Keywords = "sarin, mobi";
        (Master as MasterPage).Description = "Sarin Information Technology Expert";
    }
}