Membership.GeneratePassword(Int32, Int32) Método
Definição
Importante
Algumas informações dizem respeito a um produto pré-lançado que pode ser substancialmente modificado antes de ser lançado. A Microsoft não faz garantias, de forma expressa ou implícita, em relação à informação aqui apresentada.
Gera uma palavra-passe aleatória com o comprimento especificado.
public:
static System::String ^ GeneratePassword(int length, int numberOfNonAlphanumericCharacters);
public static string GeneratePassword(int length, int numberOfNonAlphanumericCharacters);
static member GeneratePassword : int * int -> string
Public Shared Function GeneratePassword (length As Integer, numberOfNonAlphanumericCharacters As Integer) As String
Parâmetros
- length
- Int32
O número de caracteres na palavra-passe gerada. O comprimento deve estar entre 1 e 128 caracteres.
- numberOfNonAlphanumericCharacters
- Int32
O número mínimo de caracteres não alfanuméricos (como @, #, !, %, &, e assim sucessivamente) na palavra-passe gerada.
Devoluções
Uma palavra-passe aleatória do comprimento especificado.
Exceções
length é inferior a 1 ou superior a 128 -ou-
numberOfNonAlphanumericCharacters é menor que 0 ou superior a length.
Exemplos
O exemplo de código seguinte cria um novo utilizador de membro e utiliza o GeneratePassword método para inicializar a palavra-passe do novo utilizador num valor aleatório, que é apresentado ao utilizador.
Importante
Este exemplo contém uma caixa de texto que aceita a entrada do utilizador, o que constitui uma potencial ameaça à segurança. Por defeito, as páginas Web do ASP.NET validam que a entrada do utilizador não inclui elementos de script ou HTML. Para mais informações, consulte Visão Geral dos Exploits de Scripts.
<%@ 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 CreateUser_OnClick(object sender, EventArgs args)
{
// Generate a new 12-character password with at least 1 non-alphanumeric character.
string password = Membership.GeneratePassword(12, 1);
try
{
// Create new user.
MembershipUser newUser = Membership.CreateUser(UsernameTextbox.Text, password,
EmailTextbox.Text);
Msg.Text = "User <b>" + Server.HtmlEncode(UsernameTextbox.Text) + "</b> created. " +
"Your temporary password is " + password + ".";
}
catch (MembershipCreateUserException e)
{
Msg.Text = GetErrorMessage(e.StatusCode);
}
catch (HttpException e)
{
Msg.Text = e.Message;
}
}
public string GetErrorMessage(MembershipCreateStatus status)
{
switch (status)
{
case MembershipCreateStatus.DuplicateUserName:
return "Username already exists. Please enter a different user name.";
case MembershipCreateStatus.DuplicateEmail:
return "A username for that email address already exists. Please enter a different email address.";
case MembershipCreateStatus.InvalidPassword:
return "The password provided is invalid. Please enter a valid password value.";
case MembershipCreateStatus.InvalidEmail:
return "The email address provided is invalid. Please check the value and try again.";
case MembershipCreateStatus.InvalidAnswer:
return "The password retrieval answer provided is invalid. Please check the value and try again.";
case MembershipCreateStatus.InvalidQuestion:
return "The password retrieval question provided is invalid. Please check the value and try again.";
case MembershipCreateStatus.ProviderError:
return "The authentication provider returned an error. Please verify your entry and try again. If the problem persists, please contact your system administrator.";
case MembershipCreateStatus.UserRejected:
return "The user creation request has been canceled. Please verify your entry and try again. If the problem persists, please contact your system administrator.";
default:
return "An unknown error occurred. Please verify your entry and try again. If the problem persists, please contact your system administrator.";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Create User</title>
</head>
<body>
<form id="form1" runat="server">
<h3>Create New User</h3>
<asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />
<table cellpadding="3" border="0">
<tr>
<td>Username:</td>
<td><asp:Textbox id="UsernameTextbox" runat="server" /></td>
<td><asp:RequiredFieldValidator id="UsernameRequiredValidator" runat="server"
ControlToValidate="UserNameTextbox" ForeColor="red"
Display="Static" ErrorMessage="Required" /></td>
</tr>
<tr>
<td>Email Address:</td>
<td><asp:Textbox id="EmailTextbox" runat="server" /></td>
<td><asp:RequiredFieldValidator id="EmailRequiredValidator" runat="server"
ControlToValidate="EmailTextbox" ForeColor="red"
Display="Static" ErrorMessage="Required" /></td>
</tr>
<tr>
<td></td>
<td><asp:Button id="CreateUserButton" Text="Create User" OnClick="CreateUser_OnClick" runat="server" /></td>
</tr>
</table>
</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 CreateUser_OnClick(sender As Object, args As EventArgs)
' Generate a new 12-character password with at least 1 non-alphanumeric character.
Dim password As String = Membership.GeneratePassword(12, 1)
Try
' Create new user.
Dim newUser As MembershipUser = Membership.CreateUser(UsernameTextbox.Text, password, _
EmailTextbox.Text)
Msg.Text = "User <b>" & Server.HtmlEncode(UsernameTextbox.Text) & "</b> created. " & _
"Your temporary password is " & password & "."
Catch e As MembershipCreateUserException
Msg.Text = GetErrorMessage(e.StatusCode)
Catch e As HttpException
Msg.Text = e.Message
End Try
End Sub
Public Function GetErrorMessage(status As MembershipCreateStatus) As String
Select Case status
Case MembershipCreateStatus.DuplicateUserName
Return "Username already exists. Please enter a different user name."
Case MembershipCreateStatus.DuplicateEmail
Return "A username for that email address already exists. Please enter a different email address."
Case MembershipCreateStatus.InvalidPassword
Return "The password provided is invalid. Please enter a valid password value."
Case MembershipCreateStatus.InvalidEmail
Return "The email address provided is invalid. Please check the value and try again."
Case MembershipCreateStatus.InvalidAnswer
Return "The password retrieval answer provided is invalid. Please check the value and try again."
Case MembershipCreateStatus.InvalidQuestion
Return "The password retrieval question provided is invalid. Please check the value and try again."
Case MembershipCreateStatus.ProviderError
Return "The authentication provider Returned an error. Please verify your entry and try again. If the problem persists, please contact your system administrator."
Case MembershipCreateStatus.UserRejected
Return "The user creation request has been canceled. Please verify your entry and try again. If the problem persists, please contact your system administrator."
Case Else
Return "An unknown error occurred. Please verify your entry and try again. If the problem persists, please contact your system administrator."
End Select
End Function
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Create User</title>
</head>
<body>
<form id="form1" runat="server">
<h3>Create New User</h3>
<asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />
<table cellpadding="3" border="0">
<tr>
<td>Username:</td>
<td><asp:Textbox id="UsernameTextbox" runat="server" /></td>
<td><asp:RequiredFieldValidator id="UsernameRequiredValidator" runat="server"
ControlToValidate="UserNameTextbox" ForeColor="red"
Display="Static" ErrorMessage="Required" /></td>
</tr>
<tr>
<td>Email Address:</td>
<td><asp:Textbox id="EmailTextbox" runat="server" /></td>
<td><asp:RequiredFieldValidator id="EmailRequiredValidator" runat="server"
ControlToValidate="EmailTextbox" ForeColor="red"
Display="Static" ErrorMessage="Required" /></td>
</tr>
<tr>
<td></td>
<td><asp:Button id="CreateUserButton" Text="Create User" OnClick="CreateUser_OnClick" runat="server" /></td>
</tr>
</table>
</form>
</body>
</html>
Observações
O GeneratePassword método é usado para gerar uma palavra-passe aleatória e é mais frequentemente usado pelo ResetPassword método implementado por um fornecedor de membros para repor a palavra-passe do utilizador para uma nova palavra-passe temporária.
A palavra-passe gerada contém apenas caracteres alfanuméricos e os seguintes sinais de pontuação: !@#$%^&*()_-+=[{]};:<>|./?. Não há caracteres de controlo ocultos ou não imprimíveis incluídos na palavra-passe gerada.
Note
A palavra-passe aleatória criada pelo GeneratePassword método não garante que passe a expressão regular na PasswordStrengthRegularExpression propriedade. No entanto, a palavra-passe aleatória cumprirá os critérios estabelecidos pela MinRequiredPasswordLength propriedade e pelo numberOfNonAlphanumericCharacters parâmetro.