HttpRuntime应用程序的运行时

System.Web.HttpRuntime类是整个Asp.net服务器处理的入口。

这个类提供了一系列的静态属性，反映web应用程序域的设置信息，而且每个web应用程序域中存在一个System.Web.Runtime类。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace HttpRuntimeDemo
{
    public partial class _default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            //应用程序域id
            sb.AppendFormat("AppDomainAppId:{0}<br/>", HttpRuntime.AppDomainAppId);
            //web应用程序所在文件目录
            sb.AppendFormat("AppDomainAppPath:{0}<br/>", HttpRuntime.AppDomainAppPath);
            //web应用程序的虚拟目录
            sb.AppendFormat("AppDomainAppVirtualPath:{0}<br/>", HttpRuntime.AppDomainAppVirtualPath);
            //客户端脚本在服务器上的文件目录
            sb.AppendFormat("AspClientScriptPhysicalPath:{0}<br/>", HttpRuntime.AspClientScriptPhysicalPath);
            //客户端脚本在服务器上的虚拟目录
            sb.AppendFormat("AspClientScriptPhysicalPath:{0}<br/>", HttpRuntime.AspClientScriptVirtualPath);
            //asp.net安装目录
            sb.AppendFormat("AspInstallDirectory:{0}<br/>", HttpRuntime.AspInstallDirectory);
            //bin目录
            sb.AppendFormat("BinDirectory:{0}<br/>", HttpRuntime.BinDirectory);
            //clr安装目录
            sb.AppendFormat("ClrInstallDirectory:{0}<br/>", HttpRuntime.ClrInstallDirectory);
            //生成代码的目录
            sb.AppendFormat("CodegenDir:{0}<br/>", HttpRuntime.CodegenDir);
            //iss版本
            sb.AppendFormat("IISVersion:{0}<br/>", HttpRuntime.IISVersion.MajorRevision.ToString());
            //本机配置文件所在的目录
            sb.AppendFormat("MachineConfigurationDirectory:{0}<br/>", HttpRuntime.MachineConfigurationDirectory);
            //是否使用iis7集成模式
            sb.AppendFormat("UsingIntegratedPipeline:{0}<br/>", HttpRuntime.UsingIntegratedPipeline.ToString());
            // Summary:
            //     Gets a value that indicates whether the application is mapped to a universal
            //     naming convention (UNC) share.
            sb.AppendFormat("IsOnUNCShare:{0}<br/>", HttpRuntime.IsOnUNCShare.ToString());
            Response.Write(sb.ToString());
            
        }
    }
}

上面列出了HttpRuntime主要的几个静态属性，输出结果为

而HttpRuntime的静态方法ProcessRequest将帮助我们处理Http请求。

        //
        // Summary:
        //     Drives all ASP.NET Web processing execution.
        //
        // Parameters:
        //   wr:
        //     An System.Web.HttpWorkerRequest for the current application.
        //
        // Exceptions:
        //   System.ArgumentNullException:
        //     The wr parameter is null.
        //
        //   System.PlatformNotSupportedException:
        //     The Web application is running under IIS 7 in Integrated mode.
        public static void ProcessRequest(HttpWorkerRequest wr);