Asp.Net2.0下C#环境 Login控件实现用户登录

一、前台显示效果



二、前台代码

            <asp:Login ID="Login1" runat="server" BackColor="#F7F7DE" BorderColor="#CCCC99" BorderStyle="Solid"
                BorderWidth="1px" Font-Names="Verdana" Font-Size="10pt" OnAuthenticate="Login1_Authenticate">
                <TitleTextStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
                <LayoutTemplate>
                    <table border="0" cellpadding="1" cellspacing="0" style="border-collapse: collapse">
                        <tr>
                            <td>
                                <table border="0" cellpadding="0">
                                    <tr>
                                        <td align="center" colspan="2" style="font-weight: bold; color: white; background-color: #6b696b">
                                            用户登录</td>
                                    </tr>
                                    <tr>
                                        <td align="right">
                                            <asp:Label ID="UserNameLabel" runat="server" AssociatedControlID="UserName">用户名：</asp:Label></td>
                                        <td>
                                            <asp:TextBox ID="UserName" runat="server" CssClass="STYLE1"></asp:TextBox>
                                            <asp:RequiredFieldValidator ID="UserNameRequired" runat="server" ControlToValidate="UserName"
                                                ErrorMessage="必须填写“用户名”。" ToolTip="必须填写“用户名”。" ValidationGroup="Login1">*</asp:RequiredFieldValidator>
                                        </td>
                                    </tr>
                                    <tr>
                                        <td align="right">
                                            <asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">密码：</asp:Label></td>
                                        <td>
                                            <asp:TextBox ID="Password" runat="server" TextMode="Password" CssClass="STYLE1"></asp:TextBox>
                                            <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password"
                                                ErrorMessage="必须填写“密码”。" ToolTip="必须填写“密码”。" ValidationGroup="Login1">*</asp:RequiredFieldValidator>
                                        </td>
                                    </tr>
                                    <tr>
                                        <td align="right">
                                            <asp:Label ID="Label1" runat="server" AssociatedControlID="Password">验证码：</asp:Label></td>
                                        <td>
                                            <asp:TextBox ID="GetCode" runat="server"  CssClass="STYLE2"></asp:TextBox>
                                            <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="Password"
                                                ErrorMessage="必须填写“验证码”。" ToolTip="必须填写“验证码”。" ValidationGroup="Login1">*</asp:RequiredFieldValidator><asp:Image ID="Image1" runat="server" ImageUrl="~/include/GetValidate.aspx" ImageAlign="Top"
                                                                            alt="看不清？点击更换" onclick="this.src=this.src+'?'" />
                                        </td>
                                    </tr>
                                    <tr>
                                        <td align="center" colspan="2" style="color: red">
                                            <asp:Literal ID="FailureText" runat="server" EnableViewState="False"></asp:Literal>
                                        </td>
                                    </tr>
                                    <tr>
                                        <td align="center" colspan="2">
                                            <asp:Button ID="LoginButton" runat="server" CommandName="Login" Text="登录" ValidationGroup="Login1" /></td>
                                    </tr>
                                </table>
                            </td>
                        </tr>
                    </table>
                </LayoutTemplate>
            </asp:Login>

三、后台代码

protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
    {
        TextBox GetCode = Login1.FindControl("GetCode") as TextBox;//获取登陆控件中验证码文本框值
        if (Request.Cookies["CheckCode"].Value == null)
        {
            Response.Write(@"<script language=JavaScript>{window.alert('您的浏览器设置已被禁用 Cookies，您必须设置浏览器允许使用 Cookies 选项后才能使用本系统！');}</script>");
            return;
        }
        else
        {
            if (String.Compare(Request.Cookies["CheckCode"].Value, GetCode.Text.ToString().Trim(), true) != 0)
            {
                Response.Write(@"<script language=JavaScript>{window.alert('验证码输入不正确！');}</script>");
                return;
            }
            string UserLoginID = Login1.UserName.ToString().Trim().Replace("'", "").Replace("=", "");//得到输入的用户名
            string UserLoginPwd = Login1.Password.ToString().Trim().Replace("'", "").Replace("=", "");//得到输入的密码
            //得到md5值
            string md5Pwd = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(UserLoginPwd, "md5").ToLower();
            string mySql = "select * from [User] where [sLoginID]='" + UserLoginID + "' and [LoginPWD]='" + md5Pwd + "'";
            //下面部署自己的逻辑处理，以下仅供参考
            DBConn myDB = new DBConn();
            try
            {
                SqlDataReader Rs = myDB.getDataReader(mySql);
                if (!Rs.Read())
                {
                    e.Authenticated = false;//登录不通过
                }
                else
                {
                    Session["UserLoginID"] = UserLoginID;
                    Session["UserLoginPwd"] = UserLoginPwd;
                    e.Authenticated = true;//登录通过
                    Response.Redirect("index.aspx");
                }
            }
            catch (Exception ex)
            {
                Response.Write("数据库错误，错误原因：" + ex.Message);
                Response.End();
            }

        }
    }

 四、关于验证码可以本Blog的随笔中找到，地址为：

http://www.cnblogs.com/zm235/archive/2006/10/02/520233.html