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RoleProvider.RemoveUsersFromRoles Method

Removes the specified user names from the specified roles for the configured applicationName.

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

public abstract void RemoveUsersFromRoles (
	string[] usernames,
	string[] roleNames
)
public abstract void RemoveUsersFromRoles (
	String[] usernames, 
	String[] roleNames
)
public abstract function RemoveUsersFromRoles (
	usernames : String[], 
	roleNames : String[]
)
Not applicable.

Parameters

usernames

A string array of user names to be removed from the specified roles.

roleNames

A string array of role names to remove the specified user names from.

RemoveUsersFromRoles is called by RemoveUserFromRole , RemoveUsersFromRole , RemoveUserFromRoles , and RemoveUsersFromRoles methods of the Roles class to remove the specified users from the specified roles at the data source. Only roles for the configured ApplicationName are modified.

If any of the roleNames specified are not found for the configured applicationName, we recommend that your provider throw a ProviderException.

If any of the usernames specified are not associated with any of the roleNames specified for the configured applicationName, we recommend that your provider throw a ProviderException.

If any of the specified usernames is a null reference (Nothing in Visual Basic) or is an empty string, we recommend that your provider throw an exception.

If any of the specified roleNames is a null reference (Nothing in Visual Basic) or is an empty string, we recommend that your provider throw an exception.

If your data source supports transactions, we recommend that you include each remove operation in a transaction and that you roll back the transaction and throw an exception if any remove operation fails.

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

public override void RemoveUsersFromRoles(string[] usernames, string[] rolenames)
{
  foreach (string rolename in rolenames)
  {
    if (rolename == null || rolename == "")
      throw new ProviderException("Role name cannot be empty or null.");
    if (!RoleExists(rolename))
      throw new ProviderException("Role name not found.");
  }

  foreach (string username in usernames)
  {
    if (username == null || username == "")
      throw new ProviderException("User name cannot be empty or null.");

    foreach (string rolename in rolenames)
    {
      if (!IsUserInRole(username, rolename))
        throw new ProviderException("User is not in role.");
    }
  }


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

  OdbcParameter userParm = cmd.Parameters.Add("@Username", OdbcType.VarChar, 255);
  OdbcParameter roleParm = cmd.Parameters.Add("@Rolename", OdbcType.VarChar, 255);
  cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName;

  try
  {
    conn.Open();

    foreach (string username in usernames)
    {
      foreach (string rolename in rolenames)
      {
        userParm.Value = username;
        roleParm.Value = rolename;
        cmd.ExecuteNonQuery();
      }
    }
  }
  catch (OdbcException)
  {
    // Handle exception.
  }
  finally
  {
    conn.Close();      
  }
}

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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