不复杂，用示例说明常见应用。
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load(object sender, EventArgs e)
{
NameValueCollection collection =
Request.ServerVariables;
list.Text = "";
list.Text = "总共有 " + collection.
Count.ToString() + " 个环境变量。<br><br>";
for (int i = 0; i < collection.Count; i++)
{
list.Text += "环境变量名称：" + collection.
GetKey(i) + "<br>" +
"值：" + collection.
Get(i) + "<br>" +
"---<br>";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET 中如何获取服务器端环境变量 - ITPOW</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="list" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
重要部分已经在代码中标明。
NameValueCollection 的名称空间是：
System.Collections.Specialized
该名称空间默认是导入的。
