asp.net forms身份验证，避免重复造轮子

<!-- 
通过 <authentication> 节可以配置 ASP.NET 用来 
识别进入用户的 
安全身份验证模式。 
--> 
<authentication mode="Forms"> 
<forms loginUrl="login.aspx" defaultUrl="index.aspx" 
name=".ztinfozero" path="/Manager" 
slidingExpiration="true" timeout="10"></forms> 
</authentication> 
<authorization> 
<deny users="?"/> 
</authorization> 
 
step 2: 构造 SiteUser Model 
 代码如下:

TopicUser Model 
[Serializable] 
public class TopicUser 
{ 
public TopicUser() { } 
model#region model 
private System.Int32 _autoID; 
/**//// <summary> 
/// 
/// </summary> 
public System.Int32 autoID 
{ 
get { return _autoID; } 
set { _autoID = value; } 
} 
private System.String _UserName; 
/**//// <summary> 
/// 用户名 
/// </summary> 
public System.String UserName 
{ 
get { return _UserName; } 
set { _UserName = value; } 
} 
private System.String _UserChName; 
/**//// <summary> 
/// 真实姓名 
/// </summary> 
public System.String UserChName 
{ 
get { return _UserChName; } 
set { _UserChName = value; } 
} 
private System.String _UserPass; 
/**//// <summary> 
/// 
/// </summary> 
public System.String UserPass 
{ 
get { return _UserPass; } 
set { _UserPass = value; } 
} 
private System.String _DepartMent; 
/**//// <summary> 
/// 
/// </summary> 
public System.String DepartMent 
{ 
get { return _DepartMent; } 
set { _DepartMent = value; } 
} 
private System.String _Duty; 
/**//// <summary> 
/// 
/// </summary> 
public System.String Duty 
{ 
get { return _Duty; } 
set { _Duty = value; } 
} 
private System.Int32 _UserPermit; 
/**//// <summary> 
/// 
/// </summary> 
public System.Int32 UserPermit 
{ 
get { return _UserPermit; } 
set { _UserPermit = value; } 
} 
private System.Int32 _Status; 
/**//// <summary> 
/// 
/// </summary> 
public System.Int32 Status 
{ 
get { return _Status; } 
set { _Status = value; } 
} 
#endregion 
} 
 
step 3: 创建用户登录代码： 

数据库－用户登录方法 
 代码如下:

public TopicUser UserLogon(string username, string pass) { 
string proc = "dbo.infozero_Proc_userLogOn"; 
Database db = DataFactory.userDB; 
DbCommand cmd = db.GetStoredProcCommand(proc); 
db.AddInParameter(cmd, "@username", DbType.String, username); 
db.AddInParameter(cmd, "@userpass", DbType.String, pass); 
db.AddOutParameter(cmd, "@result", DbType.Int32, 4); 
DataSet ds = db.ExecuteDataSet(cmd); 
TopicUser user = null; 
int result = 0; 
if (int.TryParse(db.GetParameterValue(cmd, "@result").ToString(), out result) ) 
user = tableToUser(ds.Tables[0]); 
return user; 
} 
#region table to user 
private TopicUser tableToUser(DataTable dt) { 
TopicUser model = null; 
if (dt.Rows.Count > 0) { 
model = new TopicUser(); 
DataRow dr = dt.Rows[0]; 
int aid = 0; 
int.TryParse(dr["autoID"].ToString(), out aid ); 
model.autoID = aid; 
model.UserName = dr["UserName"].ToString(); 
model.UserChName = dr["UserChName"].ToString(); 
model.UserPass = dr["UserPass"].ToString(); 
model.DepartMent = dr["DepartMent"].ToString(); 
model.Duty = dr["Duty"].ToString(); 
if (dr["UserPermit"].ToString() != "") 
{ 
model.UserPermit = int.Parse(dr["UserPermit"].ToString()); 
} 
if (dr["Status"].ToString() != "") 
{ 
model.Status = int.Parse(dr["Status"].ToString()); 
} 
} 
return model; 
} 
#endregion 
 
step 4 : 创建登录页： 

代码 
 代码如下:

protected void btnOK_Click(object sender, EventArgs e) 
{ 
string username = tbname.Text.Trim(); 
string pass = tbpass.Text.Trim(); 
if (!string.IsNullOrEmpty(username)) { 
if (!string.IsNullOrEmpty(pass)) { 
DataService.User b = new DataService.User(); 
DataService.TopicUser user = b.UserLogon(username, pass); 
if (user != null) { 
//roles , userid | userchname 
string userdata = string.Format("{0},{1}|{2}", 
user.UserPermit, user.autoID, user.UserChName); 
FormsAuthenticationTicket ticket = new FormsAuthenticationTicket( 
, username, DateTime.Now, DateTime.Now.AddHours(2), 
true, userdata); 
string encticket = FormsAuthentication.Encrypt(ticket); 
HttpCookie cookie = new HttpCookie( 
FormsAuthentication.FormsCookieName, encticket); 
Response.Cookies.Add(cookie); 
Response.Redirect("Index.aspx"); 
} 
} 
} 
} 
 
step 5: 在 global.asax 里添加 Application_AuthenticateRequest 事件以设置当前登录用户的信息： 
 代码如下:

protected void Application_AuthenticateRequest(object sender, EventArgs e) 
{ 
HttpCookie cookie = Context.Request.Cookies[FormsAuthentication.FormsCookieName]; 
if (cookie != null) { 
FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(cookie.Value); 
if (ticket != null) { 
string[] roles = ticket.UserData.Split(','); 
FormsIdentity id = new FormsIdentity(ticket); 
System.Security.Principal.GenericPrincipal principal = new GenericPrincipal(id, roles); 
Context.User = principal; 
} 
} 
} 
 
step 6: 如何得到当前登录用户的信息 
 代码如下:

public static TopicUser CurrentUser { 
get { 
DataService.TopicUser user = new DataService.TopicUser(); 
FormsIdentity identity = HttpContext.Current.User.Identity as FormsIdentity; 
FormsAuthenticationTicket ticket = identity.Ticket; 
string userdata = ticket.UserData; //获取自定义的 UserData 串 
if (!string.IsNullOrEmpty(userdata)) { 
if (userdata.IndexOf(',') > 0 && userdata.IndexOf('|') > 0) 
{ 
//roles , userid | userchname 
string uinfo = userdata.Split(',')[1]; 
string[] u = uinfo.Split('|'); 
int uid = 0; 
int.TryParse(u[0], out uid); 
user.autoID = uid; 
user.UserChName = u[1]; 
user.UserName = HttpContext.Current.User.Identity.Name; 
} 
} 
return user; 
} 
} 
 
由此得到当前登录用户的 ID 为 UserBase.CurrentUser.autoID ; 真实名字是： UserBase.CurrentUser.UserChName ; 
判断当前用户的角色是否为管理员： HttpContext.Current.User.IsInRole("1") ; // 1 为管理员 
退出当前登录的方法： 
LogOut.aspx 
 代码如下:

protected void Page_Load(object sender, EventArgs e) 
{ 
System.Web.Security.FormsAuthentication.SignOut(); 
Response.Write("<script>window.top.location='login.aspx';</script>"); 
Response.End(); 
} 
 
至此，身份验证完成。我们不用费尽心思在四处堆放用户是否登录判断的代码了。