public static bool InsertUpdateEntity <T>(T entity) where T : class
{
bool result = false;
using (var context = new HWContext())
{
var saved = false;
while (!saved)
{
try
{
var entType = entity.GetType();
int id = (int)entType.GetProperty("ID").GetValue(entity);
if (id == 0)
{
context.Set <T>().Add(entity);
}
else
{
context.Entry <T>(entity).State = System.Data.Entity.EntityState.Modified;
}
context.SaveChanges();
saved = true;
}
catch (DbUpdateConcurrencyException ex)
{
foreach (var entry in ex.Entries)
{
if (entry.Entity is T)
{
var proposedValues = entry.CurrentValues;
var databaseValues = entry.GetDatabaseValues();
foreach (var property in proposedValues.PropertyNames)
{
var proposedValue = proposedValues[property];
var databaseValue = databaseValues[property];
// TODO: decide which value should be written to database
proposedValues[property] = databaseValue;
}
// Refresh original values to bypass next concurrency check
entry.OriginalValues.SetValues(databaseValues);
}
else
{
throw new NotSupportedException(
"Неможливо опрацювати конфлікт даних "
+ entry);
}
}
}
}
}
return(result);
}
