private async Task <int> CalculateMigrationStartIndexAsync(
string migrationId, IMigrationManager <TContext> manager, CancellationToken ct)
{
var dbMigrations = await manager.GetAllMigrationsAsync(ct).ConfigureAwait(false);
if (dbMigrations.Count <= 0)
{
return(0);
}
var sortedDbMigrations = new SortedList <string, string>(dbMigrations.Count);
foreach (var dbMigration in dbMigrations)
{
sortedDbMigrations.Add(dbMigration, dbMigration);
}
FailIfAppliedMigrationsMismatchInMemory(sortedDbMigrations.Keys);
return(sortedDbMigrations.ContainsKey(migrationId)
? -1
: sortedDbMigrations.Count);
}
