Roles.GetRolesForUser Method (String)
Gets a list of the roles that a user is in.
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.
| Exception | Condition |
|---|---|
| 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.