DateTime.Compare 方法DateTime t1 = new DateTime(100);
DateTime t2 = new DateTime(20);if (DateTime.Compare(t1, t2) > 0) Console.WriteLine("t1 > t2");
if (DateTime.Compare(t1, t2) == 0) Console.WriteLine("t1 == t2");
if (DateTime.Compare(t1, t2) < 0) Console.WriteLine("t1 < t2");
DateTime t2 = new DateTime(20);if (DateTime.Compare(t1, t2) > 0) Console.WriteLine("t1 > t2");
if (DateTime.Compare(t1, t2) == 0) Console.WriteLine("t1 == t2");
if (DateTime.Compare(t1, t2) < 0) Console.WriteLine("t1 < t2");
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