获取系统变量在.net 的web应用程序中的确是非常方便，比如获取 "http://ap2:8080/"或者"http://10.0.0.1/mypplication/"等诸如此类的系统变量。
<body MS_POSITIONING="GridLayout"> <form id="Form2" method="post" runat="server"> <FONT face="宋体"> <asp:Button id="btn_Page" style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 16px" runat="server" Text="通过Page获取"></asp:Button> <asp:Label id="lbInfo1" style="Z-INDEX: 102; LEFT: 48px; POSITION: absolute; TOP: 56px" runat="server"></asp:Label> <asp:Button id="btn_ServerVal" style="Z-INDEX: 103; LEFT: 520px; POSITION: absolute; TOP: 16px" runat="server" Text="通过ServerVariables获取"></asp:Button> <asp:Label id="lbInfo2" style="Z-INDEX: 104; LEFT: 48px; POSITION: absolute; TOP: 80px" runat="server"></asp:Label> <asp:Label id="lbInfo3" style="Z-INDEX: 105; LEFT: 48px; POSITION: absolute; TOP: 104px" runat="server"></asp:Label> <asp:Button id="btn_Cintext" style="Z-INDEX: 106; LEFT: 280px; POSITION: absolute; TOP: 16px" runat="server" Text="通过Context获取"></asp:Button></FONT> </form> </body>private void btn_Page_Click(object sender, System.EventArgs e)
{
this.lbInfo2.Text=""; this.lbInfo3.Text=""; this.lbInfo1.Text=Page.Request.ApplicationPath+"<br/>" +Page.Request.CurrentExecutionFilePath+"<br/>" +Page.Request.UserHostAddress+"<br/>" +Page.Request.Url.Host+"<br/>" +Page.Request.RawUrl+"<br/>" +Page.Request.UserHostName+"<br/>" +Page.Request.Url.HostNameType+"<br/>" +Page.Request.Url.Port+"<br/>" +Page.Request.UrlReferrer.Host+"<br/>" +Page.Request.Url.LocalPath+"<br/>" +Page.Request.Url.Authority+"<br/>" +Page.Request.Url.UserInfo+"<br/>" +"<br/>"; 
}private void btn_Cintext_Click(object sender, System.EventArgs e) { this.lbInfo1.Text=""; this.lbInfo3.Text=""; this.lbInfo2.Text= System.Web.HttpContext.Current.Server.MachineName+"<br/>" +System.Web.HttpContext.Current.Request.ApplicationPath+"<br/>" +System.Web.HttpContext.Current.Request.CurrentExecutionFilePath+"<br/>" +System.Web.HttpContext.Current.Request.RawUrl+"<br/>" +System.Web.HttpContext.Current.Request.Url+"<br/>" +System.Web.HttpContext.Current.Request.UserHostAddress+"<br/>" +System.Web.HttpContext.Current.Request.UserHostName+"<br/>" +System.Web.HttpContext.Current.Request.RequestType+"<br/>" +System.Web.HttpContext.Current.Request.UrlReferrer.Host+"<br/>" +System.Web.HttpContext.Current.Request.UrlReferrer.HostNameType+"<br/>" +System.Web.HttpContext.Current.Request.Path+"<br/>" +System.Web.HttpContext.Current.Request.Url.Port+"<br/>" +System.Web.HttpContext.Current.Request.Url.IsDefaultPort.ToString()+"<br/>" +System.Web.HttpContext.Current.Request.Url.IsFile.ToString()+"<br/>" +System.Web.HttpContext.Current.Request.Url.LocalPath+"<br/>" +"<br/>"; }private void btn_ServerVal_Click(object sender, System.EventArgs e) { this.lbInfo1.Text=""; this.lbInfo2.Text=""; int loop1, loop2; System.Collections.Specialized.NameValueCollection coll; //以下两种方式均可 //coll=Page.Request.ServerVariables; coll=System.Web.HttpContext.Current.Request.ServerVariables; this.lbInfo3.Text=""; // Get names of all keys into a string array. String[] arr1 = coll.AllKeys; for (loop1 = 0; loop1 < arr1.Length; loop1++) 
{ this.lbInfo3.Text+=("Key: " + arr1[loop1] + "<br>"); String[] arr2=coll.GetValues(arr1[loop1]); for (loop2 = 0; loop2 < arr2.Length; loop2++) { this.lbInfo3.Text+=("Value " + loop2 + ": " + Server.HtmlEncode(arr2[loop2]) + "<br>");
} } }
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