xenadmin/XenAdmin/Actions/GUIActions/DeleteAllAlertsAction.cs

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 *     following disclaimer. 
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using System;
using System.Collections.Generic;
using System.Text;
using XenAdmin.Alerts;
using XenAdmin.Network;
using XenAdmin.Core;
using XenAPI;
using System.Windows.Forms;



namespace XenAdmin.Actions
{
    public class DeleteAllAlertsAction : AsyncAction
    {
        private readonly List<Alert> Alerts;
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        /// <param name="connection">May be null, in which case this is expected to be for client-side alerts.</param>
        public DeleteAllAlertsAction(IXenConnection connection, List<Alert> alerts)
            : base(connection,
                   connection == null ? Messages.ACTION_REMOVE_ALERTS_ON_CLIENT_TITLE : string.Format(Messages.ACTION_REMOVE_ALERTS_ON_CONNECTION_TITLE, Helpers.GetName(connection)),
                   Messages.ACTION_REMOVE_ALERTS_DESCRIPTION)
        {
            this.Alerts = alerts;

            if (connection != null)
            {
                Pool = Helpers.GetPoolOfOne(connection);
                Host = Helpers.GetMaster(connection);
            }
        }

        protected override void Run()
        {
            int i = 0;
            int max = Alerts.Count;
            Exception e = null;
            LogDescriptionChanges = false;
            try
            {
                foreach (Alert a in Alerts)
                {
                    PercentComplete = (i * 100) / max;
                    i++;
                    Description = string.Format(Messages.ACTION_REMOVE_ALERTS_PROGRESS_DESCRIPTION, i, max);
                    BestEffort(ref e, delegate()
                        {
                            try
                            {
                                a.DismissSingle(Session);
                            }
                            catch (Failure exn)
                            {
                                if (exn.ErrorDescription[0] != Failure.HANDLE_INVALID)
                                    throw;
                            }
                        });
                }
            }
            finally
            {
                LogDescriptionChanges = true;
            }

            Description = max == 1 ? Messages.ACTION_REMOVE_ALERTS_DONE_ONE : string.Format(Messages.ACTION_REMOVE_ALERTS_DONE, max);
        }

    }
}