SqlRoleProvider.IsUserInRole Method

Gets a value indicating whether the specified user is in the specified role.

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

'Declaration
Public Overrides Function IsUserInRole ( _
	username As String, _
	roleName As String _
) As Boolean
'Usage
Dim instance As SqlRoleProvider
Dim username As String
Dim roleName As String
Dim returnValue As Boolean

returnValue = instance.IsUserInRole(username, roleName)
public boolean IsUserInRole (
	String username, 
	String roleName
)
public override function IsUserInRole (
	username : String, 
	roleName : String
) : boolean
Not applicable.

Parameters

username

The user name to search for.

roleName

The role to search in.

Return Value

true if the specified user name is in the specified role; otherwise, false.

Exception typeCondition

System.ArgumentNullException

roleName is a null reference (Nothing in Visual Basic).

-or-

username is a null reference (Nothing in Visual Basic).

System.ArgumentException

roleName is an empty string or contains a comma.

-or-

username is contains a comma.

-or-

roleName is longer than 256 characters.

-or-

username is longer than 256 characters.

System.Configuration.Provider.ProviderException

An unknown error occurred while communicating with the database.

The IsUserInRole method is called by the Roles class and the IsInRole method of the Page.User property to determine whether a user is associated with a role in the SQL Server database specified in the ASP.NET application's configuration file (Web.config).

The following code example programmatically checks to see whether the logged-on user is in the Administrators role before allowing the user to view user roles. For an example of a Web.config file that enables role management, see SqlRoleProvider.

<%@ 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 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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