ASP.NET 如何動態修改 Header 屬性如添加 Meta 標籤 keywords description!

最後更新：2018-12-06 來源：互聯網

上載者：User

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// 設定關鍵字和頁面描述

代碼

1 public void setMeta(string key,string des)
2 {
3
4     HtmlMeta keywords = new HtmlMeta(), // keywords
5
6             description = new HtmlMeta(); // description
7
8         keywords.Name = "keywords";
9
10         keywords.Content = key;
11
12         description.Name = "description";
13
14         description.Content = des;
15
16         Page.Header.Controls.Add(keywords);
17
18         Page.Header.Controls.Add(description);
19
20 }
21
22

在ASP.NET編程中，由於經常採用一個頁面通過不同的參數來顯示不同的內容，因此常常需要實現動態輸出不同的html header, 比如title, keywords, descrtptions等。

推薦的簡單做法如下:

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);

}

瀏覽時輸出的頁面源碼便會達到如下效果：

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>

由於需要動態修改Header的Controls集合，因此如果放在使用者自訂控制項的Page_Onload事件中因為已經太遲而到處出現異常。對於希望用通用的控制項實現這一功能的場合，建議封裝一個普通的類，然後在MasterPager或者Page的Page_OnLoad中調用一下即可。

#region PAGE HEAD

//Page meta information

public void BackHeadContent(HtmlControl htmlCtrl)

{

Content(htmlCtrl, "網站後台管理系統", "~/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

date = new HtmlMeta(), // date

keywords = new HtmlMeta(), // keywords

description = new HtmlMeta(), // description

robots = new HtmlMeta();// robots

author.Name = "Author";

author.Content = "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

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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