我要检测两个时间段是否重叠。 每个周期都有开始日期和结束日期。 我需要检测我的第一个时间段(A)是否与另一个时间段(B/C)重叠。 在我的例子中，如果B的起点等于A的终点，它们就不重叠(倒数也是) 我发现了以下几个案例:
实际上我是这样做的:
tStartA < tStartB && tStartB < tEndA //For case 1
OR
tStartA < tEndB && tEndB <= tEndA //For case 2
OR
tStartB < tStartA && tEndB > tEndA //For case 3
(情况4在情况1或情况2的账户中被计入)
这是可行的，但似乎不是很有效。
首先，c#中有一个现有的类可以对这个(时间段)进行建模，类似于一个时间跨度，但是有一个固定的开始日期。
其次:是否已经有c#代码(如在DateTime类)可以处理这个问题?
第三:如果没有，你会用什么方法最快地进行比较?
当前回答
我不相信框架本身有这个类。也许是第三方库……
但是为什么不创建一个Period值对象类来处理这种复杂性呢?这样可以确保其他约束，比如验证开始日期时间和结束日期时间。喜欢的东西:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Whatever.Domain.Timing {
public class Period {
public DateTime StartDateTime {get; private set;}
public DateTime EndDateTime {get; private set;}
public Period(DateTime StartDateTime, DateTime EndDateTime) {
if (StartDateTime > EndDateTime)
throw new InvalidPeriodException("End DateTime Must Be Greater Than Start DateTime!");
this.StartDateTime = StartDateTime;
this.EndDateTime = EndDateTime;
}
public bool Overlaps(Period anotherPeriod){
return (this.StartDateTime < anotherPeriod.EndDateTime && anotherPeriod.StartDateTime < this.EndDateTime)
}
public TimeSpan GetDuration(){
return EndDateTime - StartDateTime;
}
}
public class InvalidPeriodException : Exception {
public InvalidPeriodException(string Message) : base(Message) { }
}
}
这样你就可以单独比较每个时期……
其他回答
public class ConcreteClassModel : BaseModel
{
... rest of class
public bool InersectsWith(ConcreteClassModel crm)
{
return !(this.StartDateDT > crm.EndDateDT || this.EndDateDT < crm.StartDateDT);
}
}
[TestClass]
public class ConcreteClassTest
{
[TestMethod]
public void TestConcreteClass_IntersectsWith()
{
var sutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 02, 01), EndDateDT = new DateTime(2016, 02, 29) };
var periodBeforeSutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 01, 01), EndDateDT = new DateTime(2016, 01, 31) };
var periodWithEndInsideSutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 01, 10), EndDateDT = new DateTime(2016, 02, 10) };
var periodSameAsSutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 02, 01), EndDateDT = new DateTime(2016, 02, 29) };
var periodWithEndDaySameAsStartDaySutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 01, 01), EndDateDT = new DateTime(2016, 02, 01) };
var periodWithStartDaySameAsEndDaySutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 02, 29), EndDateDT = new DateTime(2016, 03, 31) };
var periodEnclosingSutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 01, 01), EndDateDT = new DateTime(2016, 03, 31) };
var periodWithinSutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 02, 010), EndDateDT = new DateTime(2016, 02, 20) };
var periodWithStartInsideSutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 02, 10), EndDateDT = new DateTime(2016, 03, 10) };
var periodAfterSutPeriod = new ConcreteClassModel() { StartDateDT = new DateTime(2016, 03, 01), EndDateDT = new DateTime(2016, 03, 31) };
Assert.IsFalse(sutPeriod.InersectsWith(periodBeforeSutPeriod), "sutPeriod.InersectsWith(periodBeforeSutPeriod) should be false");
Assert.IsTrue(sutPeriod.InersectsWith(periodWithEndInsideSutPeriod), "sutPeriod.InersectsWith(periodEndInsideSutPeriod)should be true");
Assert.IsTrue(sutPeriod.InersectsWith(periodSameAsSutPeriod), "sutPeriod.InersectsWith(periodSameAsSutPeriod) should be true");
Assert.IsTrue(sutPeriod.InersectsWith(periodWithEndDaySameAsStartDaySutPeriod), "sutPeriod.InersectsWith(periodWithEndDaySameAsStartDaySutPeriod) should be true");
Assert.IsTrue(sutPeriod.InersectsWith(periodWithStartDaySameAsEndDaySutPeriod), "sutPeriod.InersectsWith(periodWithStartDaySameAsEndDaySutPeriod) should be true");
Assert.IsTrue(sutPeriod.InersectsWith(periodEnclosingSutPeriod), "sutPeriod.InersectsWith(periodEnclosingSutPeriod) should be true");
Assert.IsTrue(sutPeriod.InersectsWith(periodWithinSutPeriod), "sutPeriod.InersectsWith(periodWithinSutPeriod) should be true");
Assert.IsTrue(sutPeriod.InersectsWith(periodWithStartInsideSutPeriod), "sutPeriod.InersectsWith(periodStartInsideSutPeriod) should be true");
Assert.IsFalse(sutPeriod.InersectsWith(periodAfterSutPeriod), "sutPeriod.InersectsWith(periodAfterSutPeriod) should be false");
}
}
感谢上面的答案，帮助我编码上面的MVC项目。
StartDateDT和EndDateDT是dateTime类型
简单检查两个时间段是否重叠:
bool overlap = a.start < b.end && b.start < a.end;
或者在你的代码中:
bool overlap = tStartA < tEndB && tStartB < tEndA;
(如果你改变了主意，想说两个刚刚接触的周期重叠，可以用<=代替<。)
CodeProject上有一个很棒的库，评论也很好:http://www.codeproject.com/Articles/168662/Time-Period-Library-for-NET
这个库做了很多关于重叠、交叉等方面的工作。它太大了，不能全部复制/粘贴，但我会看看哪些具体的部分对你有用。
检查这个简单的方法(建议把这个方法放在你的dateUtility中
public static bool isOverlapDates(DateTime dtStartA, DateTime dtEndA, DateTime dtStartB, DateTime dtEndB)
{
return dtStartA < dtEndB && dtStartB < dtEndA;
}
你可以创建一个可重用的Range模式类:
public class Range<T> where T : IComparable
{
readonly T min;
readonly T max;
public Range(T min, T max)
{
this.min = min;
this.max = max;
}
public bool IsOverlapped(Range<T> other)
{
return Min.CompareTo(other.Max) < 0 && other.Min.CompareTo(Max) < 0;
}
public T Min { get { return min; } }
public T Max { get { return max; } }
}
你可以添加所有你需要的方法来合并范围，获得交集等等…
