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)

public static string[] FindUsersInRole (
	string roleName,
	string usernameToMatch
)
public static String[] FindUsersInRole (
	String roleName, 
	String usernameToMatch
)
public static function FindUsersInRole (
	roleName : String, 
	usernameToMatch : String
) : String[]
Not applicable.

Parameters

roleName

The role to search in.

usernameToMatch

The user name to search for.

Return Value

A string array containing the names of all the users whose user name matches usernameToMatch and who are members of the specified role.

Exception typeCondition

System.ArgumentNullException

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

-or-

usernameToMatch is a 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.

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 (Visual Studio).

<%@ 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 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>

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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