private static void LINQPersistence()
{
bool exit = false;
while (!exit)
{
Console.Clear();
Console.WriteLine("LINQ Persistence Demo\n");
Console.WriteLine("<0> RETURN");
Console.WriteLine("<1> LINQ AuditTrailLog");
Console.Write("\nChoose an option... ");
ConsoleKeyInfo key = Console.ReadKey();
Console.WriteLine();
ZOperationResult operationResult = new ZOperationResult();
AuditTrailUnitOfWorkEF unitOfWork =
(AuditTrailUnitOfWorkEF)DIHelper.DIManager.GetService <IAuditTrailUnitOfWork>();
AuditTrailGenericRepositoryEF <AuditTrailLog> repository =
(AuditTrailGenericRepositoryEF <AuditTrailLog>)unitOfWork.GetRepository <AuditTrailLog>();
IEnumerable <AuditTrailLog> enumerable;
Expression <Func <AuditTrailLog, bool> > where;
Func <IQueryable <AuditTrailLog>, IOrderedQueryable <AuditTrailLog> > orderBy;
switch (key.KeyChar) // <ENTER> = '\r'
{
case ('0'):
exit = true;
break;
case ('1'):
int id = 0;
Console.WriteLine("\nLINQ");
enumerable = repository
.Search(x => x.Id > id, o => o.OrderByDescending(x => x.Id));
if (operationResult.Ok)
{
foreach (AuditTrailLog entity in enumerable)
{
Console.WriteLine("{0} {1} {2}", entity.Id, entity.LogDate, entity.LogTime);
}
}
Console.WriteLine("\nLINQ with parameters");
where = x => x.Id > id;
orderBy = o => o.OrderByDescending(x => x.Id);
enumerable = repository
.Search(where, orderBy);
if (operationResult.Ok)
{
foreach (AuditTrailLog entity in enumerable)
{
Console.WriteLine("{0} {1} {2}", entity.Id, entity.LogDate, entity.LogTime);
}
}
Console.WriteLine("\nDynamic LINQ");
enumerable = repository
.Search("Id > @0", new object[] { id }, "Id descending");
if (operationResult.Ok)
{
foreach (AuditTrailLog entity in enumerable)
{
Console.WriteLine("{0} {1} {2}", entity.Id, entity.LogDate, entity.LogTime);
}
}
break;
}
if (!exit)
{
Console.WriteLine("\n{0}\n{1}\n{2}",
unitOfWork.GetType().FullName,
unitOfWork.DBMS.ToString(),
repository.GetType().FullName);
if (!operationResult.Ok)
{
Console.WriteLine(operationResult.Text);
}
Console.Write("\nPress <KEY> to continue... ");
Console.ReadKey();
}
}
}
