/// <summary> Prepare asynchronous. </summary>
///
/// <param name="context"> The submit context. </param>
/// <param name="cancellationToken"> A cancellation token. </param>
///
/// <returns> A System.Threading.Tasks.Task. </returns>
public async Task PrepareAsync(SubmitContext context, CancellationToken cancellationToken)
{
//Source query expression dynamically
var dbContext = context.ApiContext.GetProperty <DynamicContext>(DynamicContext.cDbContextKey);
if (dbContext != null)
{
foreach (var entry in context.ChangeSet.Entries.OfType <DataModificationEntry>())
{
Type entityType = dbContext.GetModelType(entry.EntitySetName);
System.Data.Entity.DbSet set = dbContext.Set(entityType);
object entity = null;
if (entry.IsNew)
{
entity = set.Create();
SetValues(entity, entityType, entry.LocalValues);
set.Add(entity);
}
else if (entry.IsDelete)
{
entity = await FindEntity(context, entry, cancellationToken);
set.Remove(entity);
}
else if (entry.IsUpdate)
{
entity = await FindEntity(context, entry, cancellationToken);
DbEntityEntry dbEntry = dbContext.Entry(entity);
SetValues(dbEntry, entry, entityType);
}
else
{
throw new NotSupportedException();
}
entry.Entity = entity;
}
}
else if (this.InnerHandler != null)
{
await this.InnerHandler.PrepareAsync(context, cancellationToken);
}
else
{
throw new NotImplementedException();
}
}
