Roles.RemoveUserFromRoles(String, String[]) Metode
Definisi
Penting
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Menghapus pengguna yang ditentukan dari peran yang ditentukan.
public:
static void RemoveUserFromRoles(System::String ^ username, cli::array <System::String ^> ^ roleNames);
public static void RemoveUserFromRoles (string username, string[] roleNames);
static member RemoveUserFromRoles : string * string[] -> unit
Public Shared Sub RemoveUserFromRoles (username As String, roleNames As String())
Parameter
- username
- String
Pengguna yang akan dihapus dari peran yang ditentukan.
- roleNames
- String[]
Array string nama peran untuk menghapus pengguna yang ditentukan.
Pengecualian
Salah satu peran dalam roleNames
adalah string kosong atau berisi koma (,).
-atau-
username
adalah string kosong atau berisi koma (,).
-atau-
roleNames
berisi elemen duplikat.
Manajemen peran tidak diaktifkan.
Contoh
Contoh kode berikut menggunakan RemoveUserFromRoles metode untuk menghapus pengguna dari satu atau beberapa peran. Untuk contoh file Web.config yang memungkinkan manajemen peran, lihat Roles.
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Security" %>
<%@ Import Namespace="System.Web.UI" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
string[] rolesArray;
MembershipUserCollection users;
public void Page_Load()
{
Msg.Text = "";
if (!IsPostBack)
{
// Bind roles to ListBox.
users = Membership.GetAllUsers();
UsersListBox.DataSource = users;
UsersListBox.DataBind();
}
}
public void UsersListBox_OnSelectedIndexChanged(object sender, EventArgs args)
{
// Bind users to ListBox.
rolesArray = Roles.GetRolesForUser(UsersListBox.SelectedItem.Value);
RolesListBox.DataSource = rolesArray;
RolesListBox.DataBind();
}
public void RemoveUser_OnClick(object sender, EventArgs args)
{
// Verify that at least a user and at least one role are selected.
if (UsersListBox.SelectedItem == null)
{
Msg.Text = "Please select a user.";
return;
}
int[] role_indices = RolesListBox.GetSelectedIndices();
if (role_indices.Length == 0)
{
Msg.Text = "Please select one or more roles.";
return;
}
// Create list of roles to be remove the selected user from.
string[] rolesList = new string[role_indices.Length];
for (int i = 0; i < rolesList.Length; i++)
{
rolesList[i] = RolesListBox.Items[role_indices[i]].Value;
}
// Remove the user to the selected roles.
try
{
Roles.RemoveUserFromRoles(UsersListBox.SelectedItem.Value, rolesList);
Msg.Text = "User removed from Role(s).";
// Rebind roles to ListBox.
rolesArray = Roles.GetRolesForUser(UsersListBox.SelectedItem.Value);
RolesListBox.DataSource = rolesArray;
RolesListBox.DataBind();
}
catch (HttpException e)
{
Msg.Text = e.Message;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Sample: Role Membership</title>
</head>
<body>
<form runat="server" id="PageForm">
<h3>Role Membership</h3>
<asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />
<table cellpadding="3" border="0">
<tr>
<td valign="top">Users:</td>
<td valign="top"><asp:ListBox id="UsersListBox" Rows="8" DataTextField="Username"
OnSelectedIndexChanged="UsersListBox_OnSelectedIndexChanged"
AutoPostBack="true" runat="server" /></td>
<td valign="top">Roles:</td>
<td valign="top"><asp:ListBox id="RolesListBox" SelectionMode="Multiple"
runat="server" Rows="8" /></td>
<td valign="top"><asp:Button Text="Remove User from Roles" id="RemoveUserButton"
runat="server" OnClick="RemoveUser_OnClick" /></td>
</tr>
</table>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Web.Security" %>
<%@ Import Namespace="System.Web.UI" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Dim rolesArray() As String
Dim users As MembershipUserCollection
Public Sub Page_Load()
Msg.Text = ""
If Not IsPostBack Then
' Bind roles to ListBox.
users = Membership.GetAllUsers()
UsersListBox.DataSource = users
UsersListBox.DataBind()
End If
End Sub
Public Sub UsersListBox_OnSelectedIndexChanged(sender As Object, args As EventArgs)
' Bind users to ListBox.
rolesArray = Roles.GetRolesForUser(UsersListBox.SelectedItem.Value)
RolesListBox.DataSource = rolesArray
RolesListBox.DataBind()
End Sub
Public Sub RemoveUser_OnClick(sender As Object, args As EventArgs)
' Verify that at least a user and at least one role are selected.
If UsersListBox.SelectedItem Is Nothing Then
Msg.Text = "Please select a user."
Return
End If
Dim role_indices() As Integer = RolesListBox.GetSelectedIndices()
If role_indices.Length = 0 Then
Msg.Text = "Please select one or more roles."
Return
End If
' Create list of roles to be remove the selected user from.
Dim rolesList(role_indices.Length - 1) As String
For i As Integer = 0 To rolesList.Length - 1
rolesList(i) = RolesListBox.Items(role_indices(i)).Value
Next
' Remove the user to the selected roles.
Try
Roles.RemoveUserFromRoles(UsersListBox.SelectedItem.Value, rolesList)
Msg.Text = "User removed from Role(s)."
' Rebind roles to ListBox.
rolesArray = Roles.GetRolesForUser(UsersListBox.SelectedItem.Value)
RolesListBox.DataSource = rolesArray
RolesListBox.DataBind()
Catch e As HttpException
Msg.Text = e.Message
End Try
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Sample: Role Membership</title>
</head>
<body>
<form runat="server" id="PageForm">
<h3>Role Membership</h3>
<asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />
<table cellpadding="3" border="0">
<tr>
<td valign="top">Users:</td>
<td valign="top"><asp:ListBox id="UsersListBox" Rows="8" DataTextField="Username"
OnSelectedIndexChanged="UsersListBox_OnSelectedIndexChanged"
AutoPostBack="true" runat="server" /></td>
<td valign="top">Roles:</td>
<td valign="top"><asp:ListBox id="RolesListBox" SelectionMode="Multiple"
runat="server" Rows="8" /></td>
<td valign="top"><asp:Button Text="Remove User from Roles" id="RemoveUserButton"
runat="server" OnClick="RemoveUser_OnClick" /></td>
</tr>
</table>
</form>
</body>
</html>
Keterangan
Metode ini RemoveUserFromRoles memanggil penyedia peran default untuk menghapus pengguna yang ditentukan dari peran yang ditentukan di sumber data.
Jika aplikasi dikonfigurasi untuk menggunakan SqlRoleProvider kelas , pembaruan database yang dilakukan selama panggilan ke RemoveUserFromRoles metode dilakukan dalam transaksi. Jika terjadi kesalahan, seperti nama pengguna yang tidak dalam peran tertentu, transaksi digulung balik dan tidak ada pembaruan yang dilakukan.