下面通过一个小例子讲解一下在网页开发中，如何实现关键字检索之后的高亮显示。我们使用到的技术是正则表达式的替换功能
1. 页面源文件
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication5._Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:Literal runat="server" ID="lb"></asp:Literal> <hr /> <asp:Button runat="server" ID="submit" Text="搜索" onclick="submit_Click"/> </div> </form> </body> </html>
2. 代码源文件using System; using System.Text.RegularExpressions; namespace WebApplication5 { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { lb.Text = "ares@xizhang.com 555 ares@microsoft.com"; } } protected void submit_Click(object sender, EventArgs e) { string temp = lb.Text; lb.Text = Regex.Replace(temp, @"[\w\.=-]+@[\w\.-]+\.[\w]{2,3}", c => { return string.Format("<span style='background-color:yellow'>{0}</span>", c); }); } } }
3. 测试效果
点击“搜索”按钮
