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RoleProvider.GetRolesForUser Method

Gets a list of the roles that a specified user is in for the configured applicationName.

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

public abstract string[] GetRolesForUser (
	string username
)
public abstract String[] GetRolesForUser (
	String username
)
public abstract function GetRolesForUser (
	username : String
) : String[]
Not applicable.

Parameters

username

The user to return a list of roles for.

Return Value

A string array containing the names of all the roles that the specified user is in for the configured applicationName.

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

If no roles exist for the specified user for the configured applicationName, we recommend that your provider return a string array with no elements.

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

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

public override string[] GetRolesForUser(string username)
{
  if (username == null || username == "")
    throw new ProviderException("User name cannot be empty or null.");

  string tmpRoleNames = "";

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

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

  OdbcDataReader reader = null;

  try
  {
    conn.Open();

    reader = cmd.ExecuteReader();

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

  if (tmpRoleNames.Length > 0)
  {
    // Remove trailing comma.
    tmpRoleNames = tmpRoleNames.Substring(0, tmpRoleNames.Length - 1);
    return tmpRoleNames.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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