public async Task Execute()
{
//process adds
if (Add != null)
{
foreach (var e in Changed)
{
if (!Existing.Any(y => Compare(y, e)))
{
await Add(e);
}
}
}
foreach (var e in Existing)
{
if (Changed.Any(x => Compare(e, x)))
{
if (Update != null)
{
await Update(e, Changed.Single(x => Compare(e, x)));
}
}
else
{
if (Remove != null)
{
await Remove(e);
}
}
}
}