一个简单的ASP.NET Forms 身份认证

当访问默认首页default.aspx时，会自动跳转到login.aspx页面上请求登录，随便输入用户名和密码，点击“登录”按钮，会回到首页，并显示当前登录的用户名。

Web.config

 1<configuration>
 2<system.web>
 3<compilation debug="true"></compilation>
 4<authentication mode="Forms">
 5<forms loginurl="login.aspx" name=".ASPXFORMSAUTH"></forms>
 6</authentication>
 7<authorization>
 8<deny users="?"></deny>
 9</authorization>
10</system.web>
11</configuration>

default.aspx

 1<html>
 2<head>
 3<title>首页</title>
 4<script language="VB" runat="server">   
 5Sub Page_Load(Sender As Object, e As EventArgs)   
 6Message.Text = String.Format("你好，{0}", Context.User.Identity.Name)   
 7End Sub   
 8sub btnSignout_Click(Sender as Object, E as EventArgs)   
 9FormsAuthentication.SignOut()   
10Response.Redirect("login.aspx")   
11end sub 
12
13</script>
14</head>
15<body>
16<asp:label id="Message" runat="server"></asp:label>
17<br/>
18<form method="post" runat="server">
19<asp:button id="btnSignout" onclick="btnSignout_Click" runat="server" text="退出登录"></asp:button>
20</form>
21</body>
22</html>

 1<head>
 2<title>首页</title>
 3<script lanugage="c#" runat="server">   
 4private void Page_Load(object sender, EventArgs e)   
 5{   
 6if (Request.IsAuthenticated)   
 7Response.Redirect("default.aspx");   
 8}   
 9void btnLogin_Click(Object sender, EventArgs e)   
10{   
11if (txtUsername.Text != null && txtUsername.Text != String.Empty && txtPassword.Text != null && txtPassword.Text != String.Empty)   
12FormsAuthentication.RedirectFromLoginPage(txtUsername.Text, true);   
13else   
14lblError.Text = "错误的用户名/密码";   
15}   
16</script>
17</head>

 1<body>
 2<form method="post" runat="server">
 3<asp:label id="lblUsername" runat="server" text="用户名："></asp:label>   
 4      
 5<asp:textbox id="txtUsername" runat="server"></asp:textbox>
 6<br/>
 7<br/>
 8<asp:label id="lblPassword" runat="server" text="密 码："></asp:label>   
 9      
10<asp:textbox id="txtPassword" runat="server" textmode="password"></asp:textbox>
11<br/>
12<asp:button id="btnLogin" onclick="btnLogin_Click" runat="server" text="登录"></asp:button>
13</form>
14<hr/>
15<br/>
16<asp:label forecolor="red" id="lblError" runat="server"></asp:label>
17</body>