Membership.EnablePasswordReset Proprietà

  • Riferimento

Definizione

Spazio dei nomi:
System.Web.Security
Assembly:
System.Web.dll

Ottiene un valore che indica se il provider di appartenenze corrente è configurato in modo da consentire agli utenti di reimpostare le loro password.

public:
 static property bool EnablePasswordReset { bool get(); };
public static bool EnablePasswordReset { get; }
static member EnablePasswordReset : bool
Public Shared ReadOnly Property EnablePasswordReset As Boolean

Valore della proprietà

Boolean

true se il provider di appartenenze supporta la reimpostazione della password. In caso contrario, false.

Esempio

Nell'esempio di codice seguente viene illustrato l'elemento di appartenenza nella system.web sezione del file Web.config per un'applicazione ASP.NET. Specifica che l'applicazione usa un'istanza di SqlMembershipProvider e abilita la reimpostazione della password.

<membership defaultProvider="SqlProvider" userIsOnlineTimeWindow="20">  
  <providers>  
    <add name="SqlProvider"  
      type="System.Web.Security.SqlMembershipProvider"  
      connectionStringName="SqlServices"  
      enablePasswordRetrieval="false"  
      enablePasswordReset="true"  
      requiresQuestionAndAnswer="true"  
      passwordFormat="Hashed"  
      applicationName="MyApplication" />  
  </providers>  
</membership>

Nell'esempio di codice seguente viene prima verificato che EnablePasswordReset è true, quindi reimposta la password di un utente e restituisce la nuova password generata automaticamente.

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Security" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

public void Page_Load(object sender, EventArgs args)
{
  if (!Membership.EnablePasswordReset)
  {
    FormsAuthentication.RedirectToLoginPage();
  }

  Msg.Text = "";

  if (!IsPostBack)
  {
    Msg.Text = "Please enter a user name.";
  }
  else
  {
    VerifyUsername();
  }
}


public void VerifyUsername()
{
    MembershipUser user = Membership.GetUser(UsernameTextBox.Text, false);

    if (user == null)
    {
      Msg.Text = "The user name " + Server.HtmlEncode(UsernameTextBox.Text) + " was not found. Please check the value and reenter your user name.";

      QuestionLabel.Text = "";
      QuestionLabel.Enabled = false;
      AnswerTextBox.Enabled = false;
      ResetPasswordButton.Enabled = false;
    }
    else
    {
      QuestionLabel.Text = user.PasswordQuestion;
      QuestionLabel.Enabled = true;
      AnswerTextBox.Enabled = true;
      ResetPasswordButton.Enabled = true;
    }
}

public void ResetPassword_OnClick(object sender, EventArgs args)
{
  string newPassword = "";

  try
  {
    newPassword = Membership.Provider.ResetPassword(UsernameTextBox.Text, AnswerTextBox.Text);
  }
  catch (NotSupportedException e)
  {
    Msg.Text = "An error has occurred resetting your password: " + e.Message + "." +
               "Please check your values and try again.";
  }
  catch (MembershipPasswordException e)
  {
    Msg.Text = "Invalid password answer. Please reenter the answer and try again.";
    return;
  }
  catch (System.Configuration.Provider.ProviderException e)
  {
    Msg.Text = "The specified user name does not exist. Please check your value and try again.";
  }

  if (newPassword != "")
  {
    Msg.Text = "Password reset. Your new password is: " + Server.HtmlEncode(newPassword);
  }
  else
  {
    Msg.Text = "Password reset failed. Please reenter your values and try again.";
  }
}


</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Sample: Reset Password</title>
</head>
<body>

<form id="form1" runat="server">
  <h3>Reset Password</h3>

  <asp:Label id="Msg" runat="server" ForeColor="maroon" /><br />

  Username: <asp:Textbox id="UsernameTextBox" Columns="30" runat="server" AutoPostBack="true" />
            <asp:RequiredFieldValidator id="UsernameRequiredValidator" runat="server"
                                        ControlToValidate="UsernameTextBox" ForeColor="red"
                                        Display="Static" ErrorMessage="Required" /><br />

  Password Question: <b><asp:Label id="QuestionLabel" runat="server" /></b><br />

  Answer: <asp:TextBox id="AnswerTextBox" Columns="60" runat="server" Enabled="false" />
          <asp:RequiredFieldValidator id="AnswerRequiredValidator" runat="server"
                                      ControlToValidate="AnswerTextBox" ForeColor="red"
                                      Display="Static" ErrorMessage="Required" Enabled="false" /><br />

  <asp:Button id="ResetPasswordButton" Text="Reset Password" 
              OnClick="ResetPassword_OnClick" runat="server" Enabled="false" />

</form>

</body>
</html>

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Web.Security" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

Public Sub Page_Load(sender As Object, args As EventArgs)

  If Not Membership.EnablePasswordReset Then
    FormsAuthentication.RedirectToLoginPage()
  End If

  Msg.Text = ""

  If Not IsPostBack Then
    Msg.Text = "Please enter a user name."
  Else
    VerifyUsername()
  End If

End Sub


Public Sub VerifyUsername()

    Dim user As MembershipUser = Membership.GetUser(UsernameTextBox.Text, False)

    If user Is Nothing Then
      Msg.Text = "The user name " & Server.HtmlEncode(UsernameTextBox.Text) & " was not found. Please check the value and reenter your user name."

      QuestionLabel.Text = ""
      QuestionLabel.Enabled = False
      AnswerTextBox.Enabled = False
      ResetPasswordButton.Enabled = False
    Else
      QuestionLabel.Text = user.PasswordQuestion
      QuestionLabel.Enabled = True
      AnswerTextBox.Enabled = True
      ResetPasswordButton.Enabled = True
    End If

End Sub


Public Sub ResetPassword_OnClick(sender As Object, args As EventArgs)

  Dim newPassword As String = ""

  Try
    newPassword = Membership.Provider.ResetPassword(UsernameTextBox.Text, AnswerTextBox.Text)
  Catch e As NotSupportedException
    Msg.Text = "An error has occurred resetting your password: " & e.Message & "." & _
               "Please check your values and try again."
  Catch e As MembershipPasswordException
    Msg.Text = "Invalid password answer. Please reenter the answer and try again."
    Return
  Catch e As System.Configuration.Provider.ProviderException
    Msg.Text = "The specified user name does not exist. Please check your value and try again."
  End Try

  If newPassword <> "" Then
    Msg.Text = "Password reset. Your new password is: " & Server.HtmlEncode(newPassword)
  Else
    Msg.Text = "Password reset failed. Please reenter your values and try again."
  End If

End Sub


</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Sample: Reset Password</title>
</head>
<body>

<form id="form1" runat="server">
  <h3>Reset Password</h3>

  <asp:Label id="Msg" runat="server" ForeColor="maroon" /><br />

  Username: <asp:Textbox id="UsernameTextBox" Columns="30" runat="server" AutoPostBack="True" />
            <asp:RequiredFieldValidator id="UsernameRequiredValidator" runat="server"
                                        ControlToValidate="UsernameTextBox" ForeColor="red"
                                        Display="Static" ErrorMessage="Required" /><br />

  Password Question: <b><asp:Label id="QuestionLabel" runat="server" /></b><br />

  Answer: <asp:TextBox id="AnswerTextBox" Columns="60" runat="server" Enabled="False" />
          <asp:RequiredFieldValidator id="AnswerRequiredValidator" runat="server"
                                      ControlToValidate="AnswerTextBox" ForeColor="red"
                                      Display="Static" ErrorMessage="Required" Enabled="False" /><br />

  <asp:Button id="ResetPasswordButton" Text="Reset Password" 
              OnClick="ResetPassword_OnClick" runat="server" Enabled="False" />

</form>

</body>
</html>

Commenti

La reimpostazione della password è la possibilità di ASP.NET l'appartenenza per sostituire la password corrente per un nome utente con una nuova password generata in modo casuale quando un utente ha dimenticato la password o la password corrente non è più valida. Ciò è particolarmente utile quando il formato della password è impostato su Hashed, poiché gli utenti non possono recuperare i valori delle password hash.

Si applica a

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