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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
)

Parameters

roleName
Type: System.String

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

Return Value

Type: System.String[]
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 null 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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

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