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RoleProvider.GetUsersInRole Method

Gets a list of users in the specified role for the configured applicationName.

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

public abstract string[] GetUsersInRole (
	string roleName
)
public abstract String[] GetUsersInRole (
	String roleName
)
public abstract function GetUsersInRole (
	roleName : String
) : String[]
Not applicable.

Parameters

roleName

The name of the role to get the list of users for.

Return Value

A string array containing the names of all the users who are members of the specified role for the configured applicationName.

GetUsersInRole is called by the GetUsersInRole method of the Roles class to retrieve the user names associated with a role from the data source. Only the roles for the configured ApplicationName are retrieved.

If the specified role name does not exist for the configured applicationName or if it is a null reference (Nothing in Visual Basic) or an empty string, we recommend that your provider throw an exception.

If no users are associated with the specified role for the configured applicationName, we recommend that your provider return a string array with no elements.

The following code example shows a sample implementation of the GetUsersInRole method.

public override string[] GetUsersInRole(string rolename)
{
  if (rolename == null || rolename == "")
    throw new ProviderException("Role name cannot be empty or null.");
  if (!RoleExists(rolename))
    throw new ProviderException("Role does not exist.");

  string tmpUserNames = "";

  OdbcConnection conn = new OdbcConnection(connectionString);
  OdbcCommand cmd = new OdbcCommand("SELECT Username FROM UsersInRoles "  +
                                    " WHERE Rolename = ? AND ApplicationName = ?", conn);

  cmd.Parameters.Add("@Rolename", OdbcType.VarChar, 255).Value = rolename;
  cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName;

  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 new string[0];
}

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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