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Roles.GetRolesForUser Method (String)

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

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

'Declaration
Public Shared Function GetRolesForUser ( _
	username As String _
) As String()
'Usage
Dim username As String 
Dim returnValue As String()

returnValue = Roles.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
System.ArgumentNullException

username is Nothing.

System.ArgumentException

username contains a comma (,).

System.Configuration.Provider.ProviderException

Role management is not enabled.

The GetRolesForUser method calls the RoleProvider.GetRolesForUser method of the default role provider to retrieve from the data source the roles that the user is in. Only the roles for the application that is specified in the ApplicationName property are retrieved.

If username is equal to the current logged-on user and CacheRolesInCookie is true, the results of the GetRolesForUser method may be returned from the role cache rather than the specified Provider.

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

<%@ 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 

Public Sub Page_Load()
  If Not IsPostBack Then 
    ' Bind roles to GridView. 

    Try
      rolesArray = Roles.GetRolesForUser()
    Catch e As HttpException
      Msg.Text = "There is no current logged on user. Role information cannot be retrieved." 
      Return 
    End Try

    UserRolesGrid.Columns(0).HeaderText = "Roles for " & User.Identity.Name
    UserRolesGrid.DataSource = rolesArray
    UserRolesGrid.DataBind()
  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: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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