static void UpdateEntry()
{
using (var db = new NewsContext())
{
var news = db.News.FirstOrDefault();
bool updateFailed;
do
{
updateFailed = false;
try
{
Console.Write("Enter updated news content: ");
var updatedEntry = Console.ReadLine();
news.Content = updatedEntry;
db.SaveChanges();
Console.WriteLine("---Entry updated successfully.---\n");
}
catch (DbUpdateConcurrencyException)
{
updateFailed = true;
Console.WriteLine("---Concurrency conflict. Try again.---");
}
} while (updateFailed);
}
}
static void Main()
{
var db = new NewsContext();
UpdateEntry();
PrintEntries(db);
}
private static void PrintNewsContent(int id)
{
var db = new NewsContext();
var newsToChange = db.News.Find(id);
Console.WriteLine(newsToChange.Content);
}
static void Main(string[] args)
{
var db = new NewsContext();
bool hasChange = false;
var firstUser = new NewsContext();
var secondUser = new NewsContext();
int id = 1;
ChangeContentValue(firstUser,id,ref hasChange);
Console.WriteLine(hasChange);
ChangeContentValue(secondUser, id,ref hasChange);
firstUser.SaveChanges();
try
{
secondUser.SaveChanges();
}
catch (DbUpdateConcurrencyException )
{
Console.WriteLine("Conflict! Text from DB: ");
PrintNewsContent(id);
ChangeContentValue(secondUser,id,ref hasChange);
Console.WriteLine("Changes successfully saved in the DB.");
}
}
private static void ReadAndEditFirstNews()
{
var db1 = new NewsContext();
var firstNews = db1.News.First();
firstNews.Content = Console.ReadLine();
var db2 = new NewsContext();
var secondNews = db2.News.First();
secondNews.Content = Console.ReadLine();
Console.WriteLine("First news content:");
Console.WriteLine(firstNews.Content);
Console.WriteLine("Second news content:");
Console.WriteLine(secondNews.Content);
db1.SaveChanges();
try
{
db2.SaveChanges();
Console.WriteLine("Changes successfully saved in the DB.");
}
catch (DbUpdateConcurrencyException)
{
Console.WriteLine("Conflict! The content is already changed.");
}
}
static void PrintEntries(NewsContext db)
{
var news = db.News
.Select(n => n.Content);
foreach (var item in news)
{
Console.WriteLine(item);
}
}
private static void ChangeContentValue(NewsContext db, int id, ref bool hasChange)
{
var article = db.News.Find(id).Content;
Console.WriteLine("Please enter content : ");
var newContent = Console.ReadLine();
db.News.Find(id).Content = newContent;
if (hasChange == false)
{
Console.WriteLine("Changes successfully saved in the DB.");
}
hasChange = true;
}