c# - 根据时间间隔验证时间

Question

我有三个规则:

• A.上午 9 点到下午 3 点之间的时段
• B.下午 3 点到 7 点之间的时间段
• C.晚上 7 点到早上 9 点之间的时段

目前我将它们表示为 TimeSpans

public class Rule
{
    public string Name {get; set;}
    public TimeSpan From {get; set;}
}

List<Rule> rules = new List<Rule>()
{
   new Rule() {From = new TimeSpan(9, 0, 0), Name = "A"},
   new Rule() {From = new TimeSpan(15, 0, 0), Name = "B"},
   new Rule() {From = new TimeSpan(19, 0, 0), Name = "C"}
};

我的问题是如何根据该规则验证时间输入，比如晚上 9 点 10 分？

它应该选择第三条规则。

Answer 1

通过向 Rule 对象添加结束时间进行轻微修改

public class Rule {
    public string Name { get; set; }
    public TimeSpan From { get; set; }
    public TimeSpan To { get; set; }
}

此扩展方法用于检查提供的输入是否在规则的时间范围内。

public static class RuleExtension {
    public static bool Contains(this Rule rule, TimeSpan input) {
        var value = TimeSpan.Parse(input.ToString());
        var start = rule.From;
        var end = rule.To;

        if (end < start) {
            //loopback
            end += TimeSpan.FromHours(24);
            if (value < start)
                value += TimeSpan.FromHours(24);
        }

        return start.CompareTo(value) <= 0 && value.CompareTo(end) < 0;
    }
}

以下单元测试用于验证扩展方法并从集合中提取规则。 (注意:使用 FluentAssertions 断言结果。)

[TestClass]
public class MyTestClass {
    [TestMethod]
    public void _ValidateTime() {
        var rules = new List<Rule>()
        {
           new Rule() {From = new TimeSpan(9, 0, 0), To = new TimeSpan(15, 0, 0), Name = "A"},
           new Rule() {From = new TimeSpan(15, 0, 0), To = new TimeSpan(19, 0, 0), Name = "B"},
           new Rule() {From = new TimeSpan(19, 0, 0), To= new TimeSpan(5, 0, 0), Name = "C"}
        };

        var input = TimeSpan.Parse("21:10");
        rules.FirstOrDefault(r => r.Contains(input))
            .Should()
            .NotBeNull()
            .And
            .Match((Rule r) => r.Name == "C");

        input = TimeSpan.Parse("08:10");
        rules.FirstOrDefault(r => r.Contains(input))
            .Should()
            .BeNull();

        input = TimeSpan.Parse("18:10");
        rules.FirstOrDefault(r => r.Contains(input))
            .Should()
            .NotBeNull()
            .And
            .Match((Rule r) => r.Name == "B");

        input = TimeSpan.Parse("10:10");
        rules.FirstOrDefault(r => r.Contains(input))
            .Should()
            .NotBeNull()
            .And
            .Match((Rule r) => r.Name == "A");
    }