反射: 通过 System.Reflection 命名空间中的类以及 System..::.Type,您可以获取有关已加载的程序集和在其中定义的类型(如类、接口和值类型)的信息。您也可以使用反射在运行时创建类型实例,以及调用和访问这些实例。
namespace _Net的反射
{
public class Person {
public void Action() {
Console.WriteLine("People Run!");
}
}
class Program
{
static void Main(string[] args)
{
int times = 500000;
var p = new Person();
//获得类型的几种方法
Type t = typeof(Person);
t = Type.GetType("_Net的反射.Person");
t = p.GetType();
//实例化对象的各种方法
Stopwatch stop = new Stopwatch(); stop.Start();
for (int i = 0; i < times; i++)
{
var per = new Person();
}
stop.Stop();
Console.WriteLine("直接实例化耗时"+System.Environment.NewLine+stop.ElapsedMilliseconds);
stop.Reset();
stop.Start();
for (int i = 0; i < times; i++)
{
var per = Activator.CreateInstance(typeof(Person));
}
stop.Stop();
Console.WriteLine("Activator.CreateInstance(typeof(Person))实例化耗时" + System.Environment.NewLine + stop.ElapsedMilliseconds);
stop.Reset();
stop.Start();
for (int i = 0; i < times; i++)
{
var per = typeof(Person).GetConstructor(Type.EmptyTypes).Invoke(null);
}
stop.Stop();
Console.WriteLine("typeof(Person).GetConstructor(Type.EmptyTypes).Invoke(null)实例化耗时" + System.Environment.NewLine + stop.ElapsedMilliseconds);
stop.Reset();
stop.Start();
for (int i = 0; i < times; i++)
{
var per =Type.GetType("_Net的反射.Person").GetConstructor(Type.EmptyTypes).Invoke(null);
}
stop.Stop();
Console.WriteLine("Type.GetType(_Net的反射.Person).GetConstructor(Type.EmptyTypes).Invoke(null)实例化耗时" + System.Environment.NewLine + stop.ElapsedMilliseconds);
stop.Reset();
stop.Start();
for (int i = 0; i < times; i++)
{
var per = Activator.CreateInstance(Type.GetType("_Net的反射.Person"));
}
stop.Stop();
Console.WriteLine(" Activator.CreateInstance(Type.GetType(_Net的反射.Person))实例化耗时" + System.Environment.NewLine + stop.ElapsedMilliseconds);
stop.Reset();
//stop.Start();
//for (int i = 0; i < times; i++)
//{
// var per = System.Reflection.Assembly.Load("_Net的反射").CreateInstance("_Net的反射.Person");
//}
//stop.Stop();
//Console.WriteLine(" Assembly.Load(_Net的反射).CreateInstance(_Net的反射.Person)实例化耗时" + System.Environment.NewLine + stop.ElapsedMilliseconds);
//stop.Reset();
stop.Start();
var la=GetCreateFunc();
for (int i = 0; i < times; i++)
{
var per = la();
}
stop.Stop();
Console.WriteLine(" Func<Person> GetCreateFunc()实例化耗时" + System.Environment.NewLine + stop.ElapsedMilliseconds);
stop.Reset();
Console.ReadKey();
}
//表达式实例化对象
static Func<Person> GetCreateFunc() {
var newExpression = Expression.New(typeof(Person));
return Expression.Lambda<Func<Person>>(newExpression, null).Compile();
}
}
}
至于EMIT太复杂啦. 个人不去研究了![]()
posted @ 2011-07-06 17:46 MyCoolDog 阅读(45) 评论(0) 编辑
网站结构
webconfig
设置为form验证, 并拒绝所有的匿名用户<authentication mode="Forms"><forms loginUrl="~/Account/Index" timeout="2880" path="/" /></authentication><authorization><deny users="?"/></authorization>
如果我们徐凯开放首页比如说Home/Index,那么做如下配置. 如果是Home文件夹下所有的页面都能访问, 那么 path=”Home”即可
<location path="Home/Index"><system.web><authorization><allow users="*" /></authorization></system.web></location>
cookie
启动程序, 来到登录页面. 如果登录成功, 那么我们需要写入cookie.
登陆页面
<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<mvc安全验证.Models.User>" %><!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>Index</title></head><body><div><% using( Html.BeginForm()){%>登录<%: Html.TextBoxFor(m => m.UserName, new { @class = "log" })%><%: Html.TextBoxFor(x => x.RealName) %><br /><input type="submit" value="login" /><%};%></div></body></html>处理方法[HttpPost]public ActionResult Index(Models.User model) {if (model.UserName == "admin"){//创造票据FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(model.UserName, false, 1);//加密票据string ticString = FormsAuthentication.Encrypt(ticket);//输出到客户端Response.Cookies.Add(new HttpCookie(FormsAuthentication.FormsCookieName, ticString));//跳转到登录前页面return Redirect(HttpUtility.UrlDecode( Request.QueryString["ReturnUrl"]));}return View();}退出.通过 new FormsAuthenticationTicket(model.UserName, false, 时长); 设置.AXPXAUTH过期时长. 但是如果new HttpCookie(FormsAuthentication.FormsCookieName, ticString) 这个cookie对象没有设置过期时间, 那么上面设置的时长再长, cookie的生命周期还是浏览器的生命周期.public ActionResult Logout() {FormsAuthentication.SignOut();return Redirect(FormsAuthentication.LoginUrl);}
八卦一下. User的值是在哪里获得的呢?我们加载进来一个DLL, 自定义的httpmodulehttp://www.cnblogs.com/jianjialin/archive/2011/06/14/2080880.html
跟踪一下. 发现在application_AuthenticateRequest事件里面, 我们可以获得User对象了.
代码下载: 群共享搜索 mvc安全验证
posted @ 2011-07-06 15:27 MyCoolDog 阅读(327) 评论(0) 编辑


