Roles.RemoveUsersFromRoles Method (System.Web.Security)

RemoveUsersFromRoles Method

Collapse All

Language Filter

This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

Roles..::.RemoveUsersFromRoles Method

Removes the specified user names from the specified roles.

Namespace: System.Web.Security
Assembly: System.Web (in System.Web.dll)

Syntax

Visual Basic (Declaration)

Public Shared Sub RemoveUsersFromRoles ( _
    usernames As String(), _
    roleNames As String() _
)

Visual Basic (Usage)

Dim usernames As String()
Dim roleNames As String()

Roles.RemoveUsersFromRoles(usernames, _
    roleNames)

public static void RemoveUsersFromRoles(
    string[] usernames,
    string[] roleNames
)

Visual C++

public:
static void RemoveUsersFromRoles(
    array<String^>^ usernames, 
    array<String^>^ roleNames
)

JScript

public static function RemoveUsersFromRoles(
    usernames : String[], 
    roleNames : String[]
)

Parameters

usernames: Type: array<System..::.String>[]()[]
A string array of user names to remove from the specified roles.

roleNames: Type: array<System..::.String>[]()[]
A string array of role names to remove the specified users from.

Exceptions

Exception	Condition
System..::.ArgumentNullException	One of the roles specified in roleNames is nullNothingnullptra null reference (Nothing in Visual Basic). -or- One of the users specified in usernames is nullNothingnullptra null reference (Nothing in Visual Basic).
System..::.ArgumentException	One of the roles specified in roleNames is an empty string or contains a comma (,). -or- One of the users specified in usernames is an empty string or contains a comma (,). -or- roleNames contains a duplicate element. -or- usernames contains a duplicate element.
System.Configuration.Provider..::.ProviderException	Role management is not enabled.

Exception

Condition

System..::.ArgumentNullException

One of the roles specified in roleNames is nullNothingnullptra null reference (Nothing in Visual Basic).

-or-

One of the users specified in usernames is nullNothingnullptra null reference (Nothing in Visual Basic).

System..::.ArgumentException

One of the roles specified in roleNames is an empty string or contains a comma (,).

-or-

One of the users specified in usernames is an empty string or contains a comma (,).

-or-

roleNames contains a duplicate element.

-or-

usernames contains a duplicate element.

System.Configuration.Provider..::.ProviderException

Role management is not enabled.

Remarks

The RemoveUsersFromRoles method calls the default role provider to remove the specified users from the specified roles at the data source.

If the application uses the SqlRoleProvider class, the database updates that are performed during the call to the RemoveUsersFromRoles method are made within a transaction. If an error is encountered, such as a user name that is not in a specified role, the transaction is rolled back and no updates are performed.

Examples

The following code example uses the RemoveUsersFromRoles method to remove one or more users from one or more roles based on user input. For an example of a Web.config file that enables role management, see Roles.

Visual Basic

<%@ 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.

    rolesArray = Roles.GetAllRoles()
    RolesListBox.DataSource = rolesArray
    RolesListBox.DataBind()

    ' Bind users to ListBox.

    users = Membership.GetAllUsers()
    UsersListBox.DataSource = users
    UsersListBox.DataBind()
  End If
End Sub


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

  ' Verify that at least one user and one role are selected.

  Dim user_indices() As Integer = UsersListBox.GetSelectedIndices()

  If user_indices.Length = 0 Then
    Msg.Text = "Please select one or more users."
    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 users to be removed from the selected roles.

  Dim usersList(user_indices.Length - 1) As String

  For i As Integer = 0 To usersList.Length - 1
    usersList(i) = UsersListBox.Items(user_indices(i)).Value
  Next


  ' Create list of roles to be remove the selected users 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 users from the selected roles.

  Try
    Roles.RemoveUsersFromRoles(usersList, rolesList)  
    Msg.Text = "User(s) removed from Role(s)."
  Catch e As HttpException
    Msg.Text = e.Message
  End Try
End Sub

</script>
<html  >
<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">Roles:</td>
      <td valign="top"><asp:ListBox id="RolesListBox" runat="server" SelectionMode="Multiple"
                                    Rows="8" /></td>
      <td valign="top">Users:</td>
      <td valign="top"><asp:ListBox id="UsersListBox" DataTextField="Username" 
                                  Rows="8" SelectionMode="Multiple" runat="server" /></td>
      <td valign="top"><asp:Button Text="Remove User(s) from Role(s)" id="RemoveUsersButton"
                                 runat="server" OnClick="RemoveUsers_OnClick" /></td>
    </tr>
  </table>
</form>

</body>
</html>

<%@ 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.

    rolesArray = Roles.GetAllRoles();
    RolesListBox.DataSource = rolesArray;
    RolesListBox.DataBind();

    // Bind users to ListBox.

    users = Membership.GetAllUsers();
    UsersListBox.DataSource = users;
    UsersListBox.DataBind();
  }
}


public void RemoveUsers_OnClick(object sender, EventArgs args)
{
  // Verify that at least one user and one role are selected.

  int[] user_indices = UsersListBox.GetSelectedIndices();

  if (user_indices.Length == 0)
  {
    Msg.Text = "Please select one or more users.";
    return;
  }

  int[] role_indices = RolesListBox.GetSelectedIndices();

  if (role_indices.Length == 0)
  {
    Msg.Text = "Please select one or more roles.";
    return;
  }


  // Create list of users to be removed from the selected roles.

  string[] usersList = new string[user_indices.Length];

  for (int i = 0; i < usersList.Length; i++)
  {
    usersList[i] = UsersListBox.Items[user_indices[i]].Value;
  }


  // Create list of roles to be remove the selected users 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 users from the selected roles.

  try
  {
    Roles.RemoveUsersFromRoles(usersList, rolesList);  
    Msg.Text = "User(s) removed from Role(s).";
  }
  catch (HttpException e)
  {
    Msg.Text = e.Message;
  } 
}

</script>
<html  >
<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">Roles:</td>
      <td valign="top"><asp:ListBox id="RolesListBox" runat="server" SelectionMode="Multiple"
                                    Rows="8" /></td>
      <td valign="top">Users:</td>
      <td valign="top"><asp:ListBox id="UsersListBox" DataTextField="Username" 
                                  Rows="8" SelectionMode="Multiple" runat="server" /></td>
      <td valign="top"><asp:Button Text="Remove User(s) from Role(s)" id="RemoveUsersButton"
                                 runat="server" OnClick="RemoveUsers_OnClick" /></td>
    </tr>
  </table>
</form>

</body>
</html>

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0

Reference

Roles Class

Roles Members

System.Web.Security Namespace

Other Resources

Understanding Role Management