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Roles.FindUsersInRole Method

Gets a list of users in a specified role where the user name contains the specified user name to match.

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

'Declaration
Public Shared Function FindUsersInRole ( _
	roleName As String, _
	usernameToMatch As String _
) As String()

Parameters

roleName
Type: System.String
The role to search in.
usernameToMatch
Type: System.String
The user name to search for.

Return Value

Type: System.String()
A string array containing the names of all the users whose user name matches usernameToMatch and who are members of the specified role.

ExceptionCondition
System.ArgumentNullException

roleName is Nothing (Nothing in Visual Basic).

-or-

usernameToMatch is Nothing.

System.ArgumentException

roleName is an empty string or contains a comma (,).

-or-

usernameToMatch is an empty string.

System.Configuration.Provider.ProviderException

Role management is not enabled.

FindUsersInRole returns a list of users in a role where the user name contains a match of the supplied usernameToMatch for the configured applicationName. For example, if the usernameToMatch parameter is set to "user," then the users "user1," "user2," "user3," and so on are returned. Users are returned in alphabetical order by user name.

The SqlRoleProvider performs its search using a LIKE clause against the usernameToMatch parameter. Any wildcards that are supported by SQL Server in LIKE clauses can be used in the usernameToMatch parameter value.

The following code example uses the FindUsersInRole method to display role membership based on user input. For an example of a Web.config file that enables role management, see Roles.

Security noteSecurity Note

This example contains a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.


<%@ 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 users() As String

Public Sub Page_Load()
  If Not IsPostBack Then
    RolesListBox.DataSource = Roles.GetAllRoles()
    RolesListBox.DataBind()
  End If
End SUb

Public Sub GoButton_OnClick(sender As Object, args As EventArgs)
  Msg.Text = ""
  users = Nothing

  If RolesListBox.SelectedItem Is Nothing Then
    Msg.Text = "Please select a role."
    Return
  End If

  users = Roles.FindUsersInRole(RolesListBox.SelectedItem.Text, UsernameTextBox.Text)

  If users.Length < 1 Then
    Msg.Text = "No matching users found in selected role."
  End If

  UserGrid.DataSource = users
  UserGrid.DataBind()
End Sub

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

<form id="form1" runat="server">
  <h3>User List</h3>

  <asp:Label id="Msg" runat="Server" ForeColor="red" />

  <table border="0" cellpadding="3" cellspacing="3">
    <tr>
      <td valign="top">Role:</td>
      <td valign="top"><asp:ListBox id="RolesListBox" runat="Server" /></td>
    </tr>
    <tr>
      <td valign="top">Username to Search for:</td>
      <td valign="top"><asp:TextBox id="UsernameTextBox" runat="server" /></td>
    </tr>
  </table>
  <asp:Button id="GoButton" Text=" Go " OnClick="GoButton_OnClick" runat="server" /><br />

  <asp:DataGrid id="UserGrid" runat="server"
                CellPadding="2" CellSpacing="1"
                Gridlines="Both">
    <HeaderStyle BackColor="darkblue" ForeColor="white" />
  </asp:DataGrid>

</form>

</body>
</html>


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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