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ASP.Net课堂--实验1(登录注册页面实现)

 
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ASP.Net课堂--实验1(登录注册页面实现)






如何利用Visual studio 2010创建一个ASP网站?
【文件】-->【新建】-->【网站】-->【ASP.Net网站】--【完成】


默认页面Default.aspx

创建以上界面:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UserLogin.aspx.cs" Inherits="UserLogin" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <div align="center">
    <h1>用户登录页面</h1>
    <form id="form1" runat="server">
        <p>  <asp:Label ID="lbusername" runat="server">用户名:</asp:Label>
         <asp:TextBox ID="tbusername" runat="server"></asp:TextBox>
         </p>

        <p> <asp:Label ID="lbpsw" runat="server">密 码:</asp:Label>
       <asp:TextBox ID="tbpsw" runat="server" TextMode="Password"></asp:TextBox>
       </p>
       <p><asp:Button ID="btnLogin" runat="server" Text="登录" onclick="btnLogin_Click" />
          <asp:Button ID="btnCancel" runat="server" Text="取消" onclick="btnCancel_Click" />
       </p>
    </form>
    </div>
</body>
</html>

实现登录验证功能
 /// <summary>
    /// 用户登录
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnLogin_Click(object sender, EventArgs e)
    {
        if (tbusername.Text == "")
        {
            Response.Write(@"<script>alert('用户名不能为空!');</script>");
        }
        if (tbpsw.Text == "")
        {
            Response.Write(@"<script>alert('密码不能为空!');</script>");
        }
        string username = tbusername.Text;
        string password = tbpsw.Text;
        string sql = "select * from T_user where username=@username and password=@password";
        SqlParameter[] parameters = { new SqlParameter("@username",username), new SqlParameter("@password", password) };
        using (SqlConnection conn = new SqlConnection(connstr))
        {
            conn.Open();
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandText = sql;
                cmd.Parameters.AddRange(parameters);
                DataSet ds = new DataSet();
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                adapter.Fill(ds);
                DataTable table = ds.Tables[0];
                if(table != null)
                    Response.Write(@"<script>alert('登录成功!');</script>");
                else
                    Response.Write(@"<script>alert('登录失败!');</script>");

            }
        }

        
    }



实验注册功能
/// <summary>
    /// 用户注册
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void brnRegister_Click(object sender, EventArgs e)
    {
        string username = tbusername.Text;
        string password = tbpsw.Text;
        string sql = "Insert into T_user(username, password) values(@username,@password)";
        SqlParameter[] parameters = { new SqlParameter("@username", username), new SqlParameter("@password", password) };
        using (SqlConnection conn = new SqlConnection(connstr))
        {
            conn.Open();
            using (SqlCommand cmd = conn.CreateCommand())
            {
                cmd.CommandText = sql;
                cmd.Parameters.AddRange(parameters);
                cmd.ExecuteNonQuery();
            }
        }

        Response.Write(@"<script>alert('注册成功!');</script>");
    }

知识点:
1.如何创建一个ASP.Net网站
2. 使用服务器控件实现界面设计
3. 对数据库的简单操作




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