Roles.FindUsersInRole Method (System.Web.Security)

FindUsersInRole Method

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

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)

Syntax

Visual Basic (Declaration)

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

Visual Basic (Usage)

Dim roleName As String
Dim usernameToMatch As String
Dim returnValue As String()

returnValue = Roles.FindUsersInRole(roleName, _
    usernameToMatch)

public static string[] FindUsersInRole(
    string roleName,
    string usernameToMatch
)

Visual C++

public:
static array<String^>^ FindUsersInRole(
    String^ roleName, 
    String^ usernameToMatch
)

JScript

public static function FindUsersInRole(
    roleName : String, 
    usernameToMatch : String
) : String[]

Parameters

roleName: Type: System..::.String
The role to search in.

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

Return Value

Type: array<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.

Exceptions

Exception	Condition
System..::.ArgumentNullException	roleName is nullNothingnullptra null reference (Nothing in Visual Basic) (Nothing in Visual Basic). -or- usernameToMatch is nullNothingnullptra null reference (Nothing in Visual Basic).
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.

Exception

Condition

System..::.ArgumentNullException

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

-or-

usernameToMatch is nullNothingnullptra null reference (Nothing in Visual Basic).

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.

Remarks

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.

Examples

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 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.

Visual Basic

<%@ 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  >
<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>

<%@ Page Language="C#" %>
<%@ 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">

string[] users;

public void Page_Load()
{
  if (!IsPostBack)
  {
    RolesListBox.DataSource = Roles.GetAllRoles();
    RolesListBox.DataBind();
  }
}

public void GoButton_OnClick(object sender, EventArgs args)
{
  Msg.Text = "";
  users = null;

  if (RolesListBox.SelectedItem == null)
  {
    Msg.Text = "Please select a role.";
    return;
  }

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

  if (users.Length < 1)
  {
    Msg.Text = "No matching users found in selected role.";
  }

  UserGrid.DataSource = users;
  UserGrid.DataBind();
}

</script>
<html  >
<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>

Platforms

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.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0

Reference

Roles Class

Roles Members

System.Web.Security Namespace