This documentation is archived and is not being maintained.

AuthorizationStoreRoleProvider.GetRolesForUser Method

Gets a list of the roles that a user is in.

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

'Declaration
Public Overrides Function GetRolesForUser ( _
	username As String _
) As String()
'Usage
Dim instance As AuthorizationStoreRoleProvider 
Dim username As String 
Dim returnValue As String()

returnValue = instance.GetRolesForUser(username)

Parameters

username
Type: System.String

The user to return a list of roles for.

Return Value

Type: System.String()
A string array containing the names of all the roles that the specified user is in.

ExceptionCondition
ArgumentNullException

username is Nothing.

ArgumentException

username contains a comma.

ProviderException

The configured applicationName was not found.

-or-

The configured scopeName was not found.

-or-

The authorization-manager runtime is not installed on the server.

FileNotFoundException

The connectionStringName attribute references a connection string to a file that does not exist.

HttpException

The AuthorizationStoreRoleProvider instance is configured with a file-based policy store, and read access to the file is not allowed at the current trust level.

The GetRolesForUser method is called by the Roles class to retrieve a list of a specified user's roles from the authorization-manager policy store specified in the ASP.NET application's configuration file (Web.config).

The following code example uses the GetRolesForUser method to retrieve a list of roles for a specified user and binds them to a System.Web.UI.WebControls.GridView control. For an example of a Web.config file that enables role management, see AuthorizationStoreRoleProvider.

<%@ 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">

Dim rolesArray() As String 
Dim users As MembershipUserCollection

Public Sub Page_Load()

  Msg.Text = "" 

  Try 
    If Not Roles.IsUserInRole(User.Identity.Name, "Administrators") Then
      Msg.Text = "You are not authorized to view user roles."
      UsersListBox.Visible = False 
      Return 
    End If 
  Catch e As HttpException
    Msg.Text = "There is no current logged on user. Role membership cannot be verified." 
    Return 
  End Try 


  If Not IsPostBack Then 
    ' Bind users to ListBox.

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


  ' If a user is selected, show the roles for the selected user. 

  If Not UsersListBox.SelectedItem Is Nothing Then 
    ' Bind roles to GridView.

    rolesArray = Roles.GetRolesForUser(UsersListBox.SelectedItem.Value)
    UserRolesGrid.DataSource = rolesArray
    UserRolesGrid.DataBind()

    UserRolesGrid.Columns(0).HeaderText = "Roles for " & UsersListBox.SelectedItem.Value
  End If 

End Sub

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

<form runat="server" id="PageForm">

  <h3>View User Roles</h3>

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

  <table border="0" cellspacing="4">
    <tr>
      <td valign="top"><asp:ListBox id="UsersListBox" DataTextField="Username" 
                                    Rows="8" AutoPostBack="true" runat="server" /></td>
      <td valign="top"><asp:GridView runat="server" CellPadding="4" id="UserRolesGrid" 
                                     AutoGenerateColumns="false" Gridlines="None" 
                                     CellSpacing="0" >
                         <HeaderStyle BackColor="navy" ForeColor="white" />
                         <Columns>
                           <asp:TemplateField HeaderText="Roles" >
                             <ItemTemplate>
                               <%# Container.DataItem.ToString() %>
                             </ItemTemplate>
                           </asp:TemplateField>
                         </Columns>
                       </asp:GridView></td>
    </tr>
  </table>

</form>

</body>
</html>

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0
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