//see https://blogs.msdn.microsoft.com/dotnet/2016/09/29/implementing-seeding-custom-conventions-and-interceptors-in-ef-core-1-0/
//for why I call DetectChanges before ChangeTracker, and why I then turn ChangeTracker.AutoDetectChangesEnabled off/on around SaveChanges
/// <summary>
/// This will validate any entity classes that will be added or updated
/// If the validation does not produce any errors then SaveChanges will be called
/// </summary>
/// <param name="context"></param>
/// <param name="config"></param>
/// <returns>List of errors, empty if there were no errors</returns>
public static IStatusGeneric SaveChangesWithValidation(this DbContext context, IGenericBizRunnerConfig config = null)
{
var status = context.ExecuteValidation();
if (status.HasErrors)
{
return(status);
}
context.ChangeTracker.AutoDetectChangesEnabled = false;
try
{
context.SaveChanges();
}
catch (Exception e)
{
var exStatus = config?.SaveChangesExceptionHandler(e, context);
if (exStatus == null)
{
throw; //error wasn't handled, so rethrow
}
status.CombineErrors(exStatus);
}
finally
{
context.ChangeTracker.AutoDetectChangesEnabled = true;
}
return(status);
}
//-------------------------------------------------------------------
//private methods
private static IStatusGeneric SaveChangesWithExtras(this DbContext context,
IGenericBizRunnerConfig config, bool turnOffChangeTracker = false)
{
var status = config?.BeforeSaveChanges != null
? config.BeforeSaveChanges(context)
: new StatusGenericHandler();
if (status.HasErrors)
{
return(status);
}
if (turnOffChangeTracker)
{
context.ChangeTracker.AutoDetectChangesEnabled = false;
}
try
{
context.SaveChanges();
}
catch (Exception e)
{
var exStatus = config?.SaveChangesExceptionHandler(e, context);
if (exStatus == null)
{
throw; //error wasn't handled, so rethrow
}
status.CombineErrors(exStatus);
}
finally
{
context.ChangeTracker.AutoDetectChangesEnabled = true;
}
return(status);
}