public T CreateOrRetrieve <T>(ef.DbSet <T> set, Func <T, bool> create_predicate, Func <T, bool> retrieve_predicate, T obj = null, bool SaveOnCreate = true) where T : class, IHasIntId
{
if (obj.id == 0)
{
return(this.FirstOrCreate(set, create_predicate, obj, SaveOnCreate));
}
else
{
return(set.Single(retrieve_predicate));
}
}
public T FirstOrCreate <T>(ef.DbSet <T> set, Func <T, bool> predicate, T obj = null, bool SaveOnCreate = true) where T : class
{
T result;
try
{
result = set.First(predicate);
}
catch (InvalidOperationException)
{
set.Add(obj);
if (SaveOnCreate)
{
this.SaveChanges();
}
result = obj;
}
return(result);
}
public virtual T CreateOrRetrieve <T>(ef.DbSet <T> set, Func <T, bool> predicate, T obj = null, bool SaveOnCreate = true) where T : class, IHasIntId, IHasPartitionString
{
return(this.CreateOrRetrieve(set, predicate, (x) => x.id == obj.id && x.partition == obj.partition, obj, SaveOnCreate));
}
public T SingleOrCreate <T>(ef.DbSet <T> set, T obj = null, bool SaveOnCreate = false) where T : element
{
return(this.CreateOrRetrieve(set, x => x.gm_name == obj.gm_name && x.partition == obj.partition, obj, SaveOnCreate));
}