RoleProvider.FindUsersInRole(String, String) Method

public:
 abstract cli::array <System::String ^> ^ FindUsersInRole(System::String ^ roleName, System::String ^ usernameToMatch);

public abstract string[] FindUsersInRole (string roleName, string usernameToMatch);

abstract member FindUsersInRole : string * string -> string[]

Public MustOverride Function FindUsersInRole (roleName As String, usernameToMatch As String) As String()

Parameters

Returns

String[]

A string array containing the names of all the users where the user name matches usernameToMatch and the user is a member of the specified role.

Examples

The following code example shows a sample FindUsersInRole implementation.

public override string[] FindUsersInRole(string rolename, string usernameToMatch)
{
  OdbcConnection conn = new OdbcConnection(connectionString);
  OdbcCommand cmd = new OdbcCommand("SELECT Username FROM UsersInRoles  " +
                                    " WHERE Username LIKE ? AND RoleName = ? AND ApplicationName = ?", conn);
  cmd.Parameters.Add("@UsernameSearch", OdbcType.VarChar, 255).Value = usernameToMatch;
  cmd.Parameters.Add("@RoleName", OdbcType.VarChar, 255).Value = rolename;
  cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = pApplicationName;

  string tmpUserNames = "";
  OdbcDataReader reader = null;

  try
  { 
    conn.Open();

    reader = cmd.ExecuteReader();

    while (reader.Read())
    {
      tmpUserNames += reader.GetString(0) + ",";
    }
  }
  catch (OdbcException)
  {
    // Handle Exception.
  }
  finally
  {
    if (reader != null) { reader.Close(); }

    conn.Close();
  }

  if (tmpUserNames.Length > 0)
  {
    // Remove trailing comma.
    tmpUserNames = tmpUserNames.Substring(0, tmpUserNames.Length - 1);
    return tmpUserNames.Split(',');
  }

  return null;
}

Public Overrides Function FindUsersInRole(ByVal rolename As String, ByVal userNameToMatch As String) As String()
    Dim conn As OdbcConnection = New OdbcConnection(connectionString)
    Dim cmd As OdbcCommand = New OdbcCommand("SELECT Username FROM UsersInRoles  " & _
                                             " WHERE Username LIKE ? AND RoleName = ? AND ApplicationName = ?", conn)
    cmd.Parameters.Add("@UsernameSearch", OdbcType.VarChar, 255).Value = usernameToMatch
    cmd.Parameters.Add("@RoleName", OdbcType.VarChar, 255).Value = rolename
    cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = pApplicationName

    Dim tmpUserNames As String = ""
    Dim reader As OdbcDataReader = Nothing

    Try
        conn.Open()

        reader = cmd.ExecuteReader()

        Do While reader.Read()
            tmpUserNames &= reader.GetString(0) & ","
        Loop
    Catch e As OdbcException
        ' Handle exception.
    Finally
        If Not reader Is Nothing Then reader.Close()
        conn.Close()
    End Try

    If tmpUserNames.Length > 0 Then
        ' Remove trailing comma.
        tmpUserNames = tmpUserNames.Substring(0, tmpUserNames.Length - 1)
        Return tmpUserNames.Split(CChar(","))
    End If

    Return Nothing
End Function

Remarks

The FindUsersInRole method is called by the Roles class and returns a list of users in a role where the user name contains a match of the supplied usernameToMatch for the configured applicationName. Wildcard support is included based on the data source. Users are returned in alphabetical order by user name.

We recommend that you throw a ProviderException if roleName does not exist in the data source.

Applies to

See also

• Implementing a Role Provider