Model层的类如下:
public class Order { public int Id { get; set; } public decimal Amount { get; set; } public string CustomerName { get; set; } public string Status { get; set; } }
public class Person { public string Name { get; set; } public int Age { get; set; } }
Program.cs代码如下:
class Program { //AutoResetEvent 允许线程通过发信号互相通信。通常,此通信涉及线程需要独占访问的资源。 //线程通过调用 AutoResetEvent 上的 WaitOne 来等待信号。如果 AutoResetEvent 处于非终止状态,则该线程阻塞,并等待当前控制资源的线程,通过调用 Set 发出资源可用的信号。 //调用 Set 向 AutoResetEvent 发信号以释放等待线程。AutoResetEvent 将保持终止状态,直到一个正在等待的线程被释放,然后自动返回非终止状态。如果没有任何线程在等待,则状态将无限期地保持为终止状态。 //可以通过将一个布尔值传递给构造函数来控制 AutoResetEvent 的初始状态,如果初始状态为终止状态,则为 true;否则为 false。 //通俗的来讲只有等myResetEven.Set()成功运行后,myResetEven.WaitOne()才能够获得运行机会;Set是发信号,WaitOne是等待信号,只有发了信号,等待的才会执行。如果不发的话,WaitOne后面的程序就永远不会执行。 private static AutoResetEvent autoSet = new AutoResetEvent(false); private static List<Person> list = new List<Person>() { new Person() {Name = Rose, Age = 19}, new Person() {Name = Steve, Age = 45}, new Person() {Name = Jessica, Age = 20}, }; private static void Main(string[] args) { //CheckOrders(); //Common(); //RemoveFromList(); //ExceptionHandling(); //----------------------------------------------------------------- //--------------------------------模拟非线程安全---------------------------- Thread t1 = new Thread(() => { //确保等待t2开始之后才运行下面的代码 autoSet.WaitOne(); foreach (var item in list) { Console.WriteLine(t1: + item.Name); Thread.Sleep(1000); } }); t1.Start(); Thread t2 = new Thread(() => { //通知t1可以执行代码 autoSet.Set(); //沉睡1秒是为了确保删除操作在t1的迭代过程中 Thread.Sleep(1000); list.RemoveAt(2); }); t2.Start(); Console.ReadKey(); } public static void CheckOrders() { List<Order> orders = new List<Order>() { new Order { Id = 123, Amount = 29.95m, CustomerName = Mark, Status = Delivered }, new Order { Id = 456, Amount = 45.00m, CustomerName = Steph, Status = Refunded }, new Order { Id = 768, Amount = 32.50m, CustomerName = Claire, Status = Delivered }, }; bool anyRefunded = orders.Any(o => o.Status == Refunded); if (anyRefunded) { Console.WriteLine(There are refunded orders); } else { Console.WriteLine(No refunds); } bool allDelivered = orders.All(o => o.Status == Delivered); if (allDelivered) { Console.WriteLine(Everything was delivered); } else { Console.WriteLine(Not everything was delivered); } } public static void Common() { //距离圣诞节的天数 var daysToChristmas = (new DateTime(DateTime.Today.Year, 12, 25) - DateTime.Today).TotalDays; Console.WriteLine(daysToChristmas); //----------------------------------------------------------------- int SUM = 10,5,0,8,10,1,4,0,10,1 .Split(',') .Select(int.Parse) .OrderBy(n => n) .Skip(3) .Sum(); Console.WriteLine(SUM); //----------------------------------------------------------------- var customers = new[] { new { Name = Annie, Email = annie@test.com }, new { Name = Ben, Email = }, new { Name = Lily, Email = lily@test.com }, new { Name = Joel, Email = joel@test.com }, new { Name = Sam, Email = }, }; foreach (var customer in from c in customers where !String.IsNullOrEmpty(c.Email) select c) { Console.WriteLine(Sending email to {0}, customer.Name); } //效果同上 foreach (var customer in customers.Where(c => !String.IsNullOrEmpty(c.Email))) { Console.WriteLine(Sending email to {0}, customer.Name); } } public static void RemoveFromList() { Func<List<string>> makeList = () => Enumerable.Range(1, 10000000).Select(n => (Item + n + )).ToList(); var itemsToRemove = new[] { Item 0, Item 1, Item 50, Item 1000, Item 999999, Item 9999999 }; var stopwatch = new Stopwatch(); var list = makeList(); stopwatch.Start(); foreach (var item in itemsToRemove) { list.Remove(item); } stopwatch.Stop(); Console.WriteLine(list.Count + Foreach took {0}ms, stopwatch.ElapsedMilliseconds); list = makeList(); stopwatch.Restart(); var newList = list.Except(itemsToRemove).ToList(); //效率极低 stopwatch.Stop(); Console.WriteLine(newList.Count + Except took {0}ms, stopwatch.ElapsedMilliseconds); } public static void ExceptionHandling() { var numbers = Enumerable.Range(1, 10) .Select(n => 5 - n) .Select(n => { try { return 10 / n; } catch (Exception e) { Console.WriteLine(Error in lambda: + e.Message); return -1; } }); foreach (var n in numbers) { Console.WriteLine(n); } } }
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