public static string ImportSongPerformers(MusicHubDbContext context, string xmlString)
{
StringBuilder stBuilder = new StringBuilder();
var xmlSeserializer = new XmlSerializer(typeof(ImportPerformerDto[]),
new XmlRootAttribute("Performers"));
var performersDto = (ImportPerformerDto[])xmlSeserializer.Deserialize(new StringReader(xmlString));
var performerList = new List<Performer>();
foreach (var performerDto in performersDto)
{
if (!IsValid(performerDto))
{
stBuilder.AppendLine(ErrorMessage);
continue;
}
bool havesongs = true;
var songs = new List<Song>();
foreach (var songDto in performerDto.MappingTable)
{
Song song = context.Songs.Where(s => s.Id == songDto.DtoId).FirstOrDefault();
if (song == null)
{
songs.Clear();
havesongs = false;
break;
}
else
{
songs.Add(song);
}
}
if (!havesongs)
{
stBuilder.AppendLine(ErrorMessage);
continue;
}
var performer = new Performer
{
FirstName = performerDto.FirstName,
LastName = performerDto.LastName,
Age = performerDto.Age,
NetWorth = performerDto.NetWorth
};
context.Performers.Add(performer);
foreach (var song in songs)
{
var songPerformer = new SongPerformer
{
Song = song,
Performer = performer
};
context.SongsPerformers.Add(songPerformer);
}
// Imported { performer first name} ({ songs count}songs)
string message = String.Format(SuccessfullyImportedPerformer, performer.FirstName, songs.Count);
stBuilder.AppendLine(message);
}
string result = stBuilder.ToString().TrimEnd();
context.SaveChanges();
return result;
}
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