Question

我必须向网站管理员实施asp.net login control：

我做的是：

我做了3件事

SITEMASTER
Home.aspx
WebForm1.aspx的

在网站管理员中，我写了以下内容：

<form id="form1" runat="server">
    <div>
        <asp:Login ID="Login1" runat="server" OnAuthenticate="Login1_Authenticate" OnLoginError="Login1_LoginError">
        </asp:Login>
    </div>
    <div>
        <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
        </asp:ContentPlaceHolder>
    </div>
</form>

在后面的代码中，我写了以下内容：

 public partial class SiteMaster1 : System.Web.UI.MasterPage
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
                ViewState["LoginErrors"] = 0;
        }

        #region Login Functionality
        /// <summary>
        ///  will validation if the username and password while click on login button from asp.net login button  
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
        {
            if (YourValidationFunction(Login1.UserName, Login1.Password))
            {
                //e.Authenticated = true;
                Login1.Visible = false;
                //MessageLabel.Text = "Successfully Logged In";
            }
            else
            {
                e.Authenticated = false;
            }
        }
        /// <summary>
        /// Will show the error
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Login1_LoginError(object sender, EventArgs e)
        {
            if (ViewState["LoginErrors"] == null)
                ViewState["LoginErrors"] = 0;

            int ErrorCount = (int)ViewState["LoginErrors"] + 1;
            ViewState["LoginErrors"] = ErrorCount;

            if ((ErrorCount > 3) && (Login1.PasswordRecoveryUrl != string.Empty))
                Response.Redirect(Login1.PasswordRecoveryUrl);
        }

        /// <summary>
        /// function to check the username and password to server 
        /// </summary>
        /// <param name="UserName"></param>
        /// <param name="Password"></param>
        /// <returns></returns>
        private bool YourValidationFunction(string UserName, string Password)
        {
            bool boolReturnValue = false;
            string strConnection = "i wrote correct string, cannot write here on stackoverflow";

            SqlConnection sqlConnection = new SqlConnection(strConnection);
            String SQLQuery = "SELECT UserName, Password FROM aspnet_Users";
            SqlCommand command = new SqlCommand(SQLQuery, sqlConnection);
            SqlDataReader Dr;
            sqlConnection.Open();
            Dr = command.ExecuteReader();
            while (Dr.Read())
            {
                if ((UserName == Dr["UserName"].ToString()) & (Password == Dr["Password"].ToString()))
                {
                    boolReturnValue = true;
                }
                Dr.Close();
                return boolReturnValue;
            }
            return boolReturnValue;
        }
        #endregion
    }

我的问题是：我想管理如何显示

Asp.Net登录控制：

让我们说，当我转到其他页面webform1.aspx时，我仍然可以看到asp.net登录控件（即使我隐藏了该控件）。而不是这个，我想显示welcome [Username]

Answer 1

将Login控件的DestinationPageUrl属性设置为您想要的页面

作为旁注，您验证用户的方法存在严重问题

private bool YourValidationFunction(string UserName, string Password)
{
    bool boolReturnValue = false;
    string strConnection = "i wrote correct string, cannot write here on stackoverflow";

    String SQLQuery = "SELECT count(*) FROM aspnet_Users where Username=@uname AND Password = @pwd";
    using(SqlConnection sqlConnection = new SqlConnection(strConnection))
    using(SqlCommand command = new SqlCommand(SQLQuery, sqlConnection))
    {
        sqlConnection.Open();
        command.Parameters.AddWithValue("@uname", Username);
        command.Parameters.AddWithValue("@pwd", Password);
        int result = Convert.ToInt32(command.ExecuteScalar());
        boolReturnValue = (result > 0);
    }
    return boolReturnValue;
}

在重写函数时，我使用using statement确保在使用后关闭并销毁连接。我还引入了parameterized query以避免Sql Injection问题，我已经更改了查询命令以使用ExecuteScalar方法

连接是一种宝贵的资源，应该在使用后立即发布到操作系统。 using语句确保即使在异常情况下连接也会关闭并放置在右括号中。参数化查询避免将恶意字符串传递给数据库，并允许框架在数值中正确格式化字符串，日期和小数。当您只需要从数据库返回的单个值时，ExecuteScalar非常有用，就像您只需要知道数据库中是否存在对用户+密码一样。

asp.net登录功能

1 个答案: