// 设置关键字和页面描述
public void setMeta(string key,string des)
{
HtmlMeta
keywords = new HtmlMeta(), // keywords
description = new HtmlMeta(); // description
keywords.Name = "keywords";
keywords.Content = key;
description.Name = "description";
description.Content = des;
Page.Header.Controls.Add(keywords);
Page.Header.Controls.Add(description);
}
在ASP.NET编程中，由于经常采用一个页面通过不同的参数来显示不同的内容，因此常常需要实现动态输出不同的html header, 比如title, keywords, descrtptions等。
推荐的简单做法如下:
protected void Page_Load(object sender, EventArgs e)
{
//Page title
Page.Title = "This is a title and meta test page.";
//Encode/Content type
HtmlMeta encode = new HtmlMeta();
encode.HttpEquiv = "Content-Type";
encode.Content = "text/html; charset=utf-8";
Page.Header.Controls.Add(encode);
//Language
HtmlMeta lang = new HtmlMeta();
lang.HttpEquiv = "Content-Language";
lang.Content = "zh-cn";
Page.Header.Controls.Add(lang);
//Description
HtmlMeta desc = new HtmlMeta();
desc.Name = "Description";
desc.Content = "Test the meta controls";
Page.Header.Controls.Add(desc);
//Keyword
HtmlMeta keywords = new HtmlMeta();
keywords.Name = "keywords";
keywords.Content = "title,meta,test,page";
Page.Header.Controls.Add(keywords);
//Link/CSS
HtmlLink cssLink = new HtmlLink();
cssLink.Href = "MasterPage.css";
cssLink.Attributes.Add("rel", "stylesheet");
cssLink.Attributes.Add("type", "text/css");
Page.Header.Controls.Add(cssLink);
}
浏览时输出的页面源码便会达到如下效果：
<head><title>
This is a title and meta test page.
</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta http-equiv="Content-Language" content="zh-cn" /><meta name="Description" content="Test the meta controls" /><<meta name="keywords" content="title,meta,test,page" /><link href="MasterPage.css" rel="stylesheet" type="text/css" /></head>
由于需要动态修改Header的Controls集合，因此如果放在用户自定义控件的Page_Onload事件中因为已经太迟而到处出现异常。对于希望用通用的控件实现这一功能的场合，建议包装一个普通的类，然后在MasterPager或者Page的Page_OnLoad中调用一下即可。
#region PAGE HEAD
//Page meta information
public void BackHeadContent(HtmlControl htmlCtrl)
{
Content(htmlCtrl, "网站后台管理系统", "~/CssStyle/SiteStyles.css");
}
public void HeadContent(HtmlControl htmlCtrl, string strPageTitle)
{
Content(htmlCtrl, strPageTitle, "~/CssStyle/Styles.css");
}
private void Content(HtmlControl htmlCtrl, string strTitle,string cssFile)
{
//Title
HtmlTitle title = new HtmlTitle();
title.Text = strTitle;
htmlCtrl.Controls.Add(title);
//Link/CSSfile:
HtmlLink cssLink = new HtmlLink();
cssLink.Href = cssFile;
cssLink.Attributes.Add("rel", "stylesheet");
cssLink.Attributes.Add("type", "text/css");
htmlCtrl.Controls.Add(cssLink);
HtmlMeta
author = new HtmlMeta(), // author
copyright = new HtmlMeta(), // copyright
date = new HtmlMeta(), // date
keywords = new HtmlMeta(), // keywords
description = new HtmlMeta(), // description
robots = new HtmlMeta();// robots
author.Name = "Author";
author.Content = "Insus.NET";
copyright.Name = "Copyright";
copyright.Content = "Copyright 2008 Insus.NET";
date.Name = "date";
date.Content = DateTime.Now.ToShortDateString() + " " + DateTime.Now.ToShortTimeString();
keywords.Name = "keywords";
keywords.Content = "Insus ";
description.Name = "description";
robots.Name = "robots";
robots.Content = "all";
string[] InsusWords = "VISUAL STUDIO 2003,VISUAL STUDIO 2005,Microsoft SQL Server 2005,ASP.NET,ASP.NET 2.0,VB.NET,C#,AJAX,LINQ"
.Replace("\\r", string.Empty)
.Replace("\\n", string.Empty)
.Replace(">br />", string.Empty)
.Replace(",", string.Empty)
.Replace("\\'", string.Empty)
.Split(' ');
foreach (string word in InsusWords)
keywords.Content += word + ",";
if (keywords.Content.ToString().Length > 1024)
{
keywords.Content = keywords.Content.Substring(0, keywords.Content.IndexOf(" ", 1024));
}
description.Content = "This web site use asp.net2.0 and C# and Ajax technology";
if (description.Content.ToString().Length > 1024)
{
description.Content = description.Content.Substring(0, description.Content.IndexOf(" ", 1024));
}
htmlCtrl.Controls.Add(author);
htmlCtrl.Controls.Add(copyright);
htmlCtrl.Controls.Add(date);
htmlCtrl.Controls.Add(keywords);
htmlCtrl.Controls.Add(description);
htmlCtrl.Controls.Add(robots);
}
#endregion PAGE HEAD