如何在ASP.NET中使用验证通过的Windows Live ID用户登录网站

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> <table width="320"> <tr> <td> <h1> 欢迎来到Windows Live ID™网络身份验证SDK中的C#模板</h1> <p> 下面的链接表明您是否登录。如果该链接的文本是 <b>Sign in</b>, 表明您尚未登录。如果它显示 <b>Sign out</b>,表明您已经登录。</p> <iframe id="WebAuthControl" name="WebAuthControl" src="http://login.live.com/controls/WebAuth.htm?appid=<%=AppId%>&style=font-size%3A+10pt%3B+font-family%3A+verdana%3B+background%3A+white%3B" width="80px" height="20px" marginwidth="0" marginheight="0" align="middle" frameborder="0" scrolling="no"></iframe> <p> <% if ( UserId == null ) { %> 你还没有登录到网站，请点击 <b>Sign in</b> 链接. <% } else { %> 您已经登录到网站，您的用户编号ID = "<b><%=UserId%></b>". <% } %> </p> </td> </tr> </table> </body> </html>

Default.aspx文件的代码隐藏文件代码如下：

using System;
using System.Web;
using System.IO;
using WindowsLive;

/// <summary>
/// This is the default aspx.cs page for the sample Web Auth site.
/// It gets the application ID and user ID for display on the main
/// page.  
/// </summary>
public partial class DefaultPage : System.Web.UI.Page
{
    const string LoginCookie = "webauthtoken";

    // Initialize the WindowsLiveLogin module.
    static WindowsLiveLogin wll = new WindowsLiveLogin(true);

    protected static string AppId = wll.AppId;
    protected string UserId;
    
    protected void Page_Load(object sender, EventArgs e)
    {
        /* If the user token has been cached in a site cookie, attempt
           to process it and extract the user ID. */

        HttpRequest req = HttpContext.Current.Request;
        HttpCookie loginCookie = req.Cookies[LoginCookie];

        if(loginCookie != null){
            string token = loginCookie.Value;

            if (!string.IsNullOrEmpty(token))
            {
                WindowsLiveLogin.User user = wll.ProcessToken(token);

                if (user != null) 
                {
                    UserId = user.Id;
                }
            }
        }
    }
}

Default.aspx将作为网站的一个登录页。用户点击登录按钮，将被重定向到的Windows Live 登录页面。当他微软进行身份验证后，微软会重新回到我们的处理程序页上，所以，我们现在将创建一个新的aspx页，并将其命名webauth-handler.aspx。还记得，当我们在注册申请Windows Live 时提供的返回URL的网页吗。

webauth-handler.aspx页面将作为处理Windows Live重定向回到您的网站用户的网页。而且微软Windows Live将提供一个验证特定值给您使用。我们可以简单地删除所有的标记，下面是webauth-handler.aspx代码隐藏类的代码：

         1: using System;

         2: using System.Web;

         3: using System.IO;

         4: using WindowsLive;

         5:  

         6: /// <summary>

         7: /// This page handles the login, logout and clearcookie Web Auth

         8: /// actions.  When you create a Windows Live application, you must

         9: /// specify the URL of this handler page.

        10: /// </summary>

        11: public partial class HandlerPage : System.Web.UI.Page

        12: {

        13:     const string LoginPage = "default.aspx";

        14:     const string LogoutPage = LoginPage;

        15:     const string LoginCookie = "webauthtoken";

        16:     static DateTime ExpireCookie = DateTime.Now.AddYears(-10);

        17:     static DateTime PersistCookie = DateTime.Now.AddYears(10);

        18:  

        19:     // Initialize the WindowsLiveLogin module.

        20:     static WindowsLiveLogin wll = new WindowsLiveLogin(true);

        21:  

        22:     protected void Page_Load(object sender, EventArgs e)

        23:     {

        24:         HttpRequest req = HttpContext.Current.Request;

        25:         HttpResponse res = HttpContext.Current.Response;

        26:  

        27:         // Extract the 'action' parameter from the request, if any.

        28:         string action = req["action"];

        29:  

        30:         /*

        31:           If action is 'logout', clear the login cookie and redirect

        32:           to the logout page.

        33: 

        34:           If action is 'clearcookie', clear the login cookie and

        35:           return a GIF as response to signify success.

        36: 

        37:           By default, try to process a login. If login was

        38:           successful, cache the user token in a cookie and redirect

        39:           to the site's main page.  If login failed, clear the cookie

        40:           and redirect to the main page.

        41:         */

        42:  

        43:         if (action == "logout")

        44:         {

        45:             HttpCookie loginCookie = new HttpCookie(LoginCookie);

        46:             loginCookie.Expires = ExpireCookie;

        47:             res.Cookies.Add(loginCookie);

        48:             res.Redirect(LogoutPage);

        49:             res.End();

        50:         } 

        51:         else if (action == "clearcookie")

        52:         {

        53:             HttpCookie loginCookie = new HttpCookie(LoginCookie);

        54:             loginCookie.Expires = ExpireCookie;

        55:             res.Cookies.Add(loginCookie);

        56:  

        57:             string type;

        58:             byte[] content;

        59:             wll.GetClearCookieResponse(out type, out content);

        60:             res.ContentType = type;

        61:             res.OutputStream.Write(content, 0, content.Length);

        62:  

        63:             res.End();

        64:         } 

        65:         else 

        66:         {

        67:             WindowsLiveLogin.User user = wll.ProcessLogin(req.Form);

        68:  

        69:             HttpCookie loginCookie = new HttpCookie(LoginCookie);

        70:             if (user != null)

        71:             {

        72:                 loginCookie.Value = user.Token;

        73:  

        74:                 if (user.UsePersistentCookie)

        75:                 {

        76:                     loginCookie.Expires = PersistCookie;

        77:                 }

        78:             } 

        79:             else 

        80:             {

        81:                 loginCookie.Expires = ExpireCookie;

        82:             }   

        83:  

        84:             res.Cookies.Add(loginCookie);

        85:             res.Redirect(LoginPage);

        86:             res.End();

        87:         }

        88:     }

        89: }