private iTask UpdateCache(string id, iTask c)
{
iTask old;
if (iTaskCache.TryGetValue(id, out old))
{
if (iTaskCache.TryUpdate(id, c, old))
{
return(c);
}
}
return(null);
}
public async Task <iTask> UpdateAsync(string id, iTask c)
{
return(await Task.Run(() =>
{
db.Tasks.Update(c);
int affected = db.SaveChanges();
if (affected == 1)
{
return Task.Run(() => UpdateCache(id, c));
}
return null;
}));
}
public async Task <iTask> CreateAsync(iTask c)
{
EntityEntry <iTask> added = await db.Tasks.AddAsync(c);
int affected = await db.SaveChangesAsync();
if (affected == 1)
{
return(iTaskCache.AddOrUpdate(c.Id.ToString(), c,
UpdateCache));
}
else
{
return(null);
}
}
public async Task <bool> DeleteAsync(string id)
{
return(await Task.Run(() =>
{
id = id.ToUpper();
iTask c = db.Tasks.Find(id);
db.Tasks.Remove(c);
int affected = db.SaveChanges();
if (affected == 1)
{
return Task.Run(() => iTaskCache.TryRemove(id, out c));
}
else
{
return null;
}
}));
}