c#实现WINDOWS登录 dodo

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Runtime.InteropServices;
using System.Security.Principal;

namespace yutest
{
    public partial class _Default : System.Web.UI.Page
    {

        [DllImport("advapi32.dll", CharSet = CharSet.Auto)]
        public static extern bool LogonUser(string lpszUsername,string lpszDomain,string lpszPassword,int dwLogonType,int dwLogonProvider,out int phToken);

        protected void Page_Load(object sender, EventArgs e)
        {
            string aaa = System.Threading.Thread.CurrentPrincipal.Identity.Name;
            //string bbb = System.Threading.Thread.CurrentPrincipal.Identity.n;

            //System.Environment.UserDomainName  
            //System.Environment.UserName
           

        }

        protected void Button1_Click(object sender, System.EventArgs e)
        {
            //验证用户的输入是否为空
            if (tDomain.Text.Trim().Length > 0 && tUserName.Text.Trim().Length > 0&& tPassword.Text.Trim().Length > 0)
            {   //调用函数Login(string UserName, string Password, string Domain)
                //实现Windows登录
                if (Login(tUserName.Text.Trim(), tPassword.Text.Trim(),tDomain.Text.Trim()) == true)
                {   //显示登录成功信息
                    LoginMsg.Text = "登录成功！！！";
                    LoginMsg.Visible = true;
                    return;
                }
                else
                {   //显示登录失败信息
                    LoginMsg.Text = "登录失败，请重新输入用户名称、密码及其系统域名！！！";
                    LoginMsg.Visible = true;
                }
            }

        }

        private bool Login(string UserName, string Password, string Domain)
        {       //获取用户名称和系统域名
            string text1 = Domain.Trim();
            string text2 = UserName.Trim();
            text2 = text2.Replace("/", @"\");      //处理符号“/”
            int num1 = text2.IndexOf('\\');        //获取符号“\”的索引
            if (num1 != -1)
            {   //格式化用户名称和系统域名
                text1 = text2.Substring(0, num1);
                text2 = text2.Substring(num1 + 1);
            }
            else
            {   //格式化用户名称和系统域名
                num1 = text2.IndexOf('@');
                if (num1 != -1)
                {
                    text1 = text2.Substring(num1 + 1);
                    text2 = text2.Substring(0, num1);
                }
            }
            //调用函数AuthenticateUser()实现用户Windows登录
            return AuthenticateUser(text2, Password.Trim(), text1);
        }
        private bool AuthenticateUser(string UserName, string Password,string Domain)
        {              //设置用户登录成功的标志
            bool flag1 = false;
            try
            {
                int num1; IntPtr ptr1;
                //调用Windows登录的API
                if (!LogonUser(UserName, Domain, Password, 2, 0, out num1))
                {   //返回登录结果
                    return flag1;
                }
                //调用.NET中的Windows登录
                ptr1 = new IntPtr(num1);
                WindowsIdentity identity1 = new WindowsIdentity(ptr1);
                WindowsPrincipal principal1 = new WindowsPrincipal(identity1);
                HttpContext.Current.User = principal1;
                //设置系统Cookie和重定向页面
                FormsAuthentication.SetAuthCookie(principal1.Identity.Name, false);
                FormsAuthentication.RedirectFromLoginPage(UserName, false);
                flag1 = true;
            }
            catch (Exception) { }
            return flag1;
        }

    }
}