public void ModifyPackage()
{
var watch = Stopwatch.StartNew();
UserPackage package = PersonalCacheStruct.GetOrAdd("10000", new Lazy <UserPackage>(() =>
{
return(new UserPackage()
{
UserId = 10000
});
}));
package.ModifyLocked(() =>
{
package.Items[100] = 1;
});
WaitEnd(watch);
}