我有一个范围列表,我想知道它们是否重叠.
我有以下代码.哪个似乎没有用.有没有更简单的方法来做到这一点或工作的方式:)
提前感谢任何建议.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private IList<Range> rangeList;
private void Form1_Load(object sender,EventArgs e)
{
rangeList.Add(new Range{FromNumber = 0,ToNumber = 100});
rangeList.Add(new Range { FromNumber = 101,ToNumber = 200 });
// this range should over lap and throw an exception
rangeList.Add(new Range { FromNumber = 199,ToNumber = 300 });
}
private bool RangesOverlap()
{
var bigList = new List<List<int>>();
foreach (var range in this.rangeList)
{
bigList.Add(new List<int> { range.FromNumber,range.ToNumber });
}
IEnumerable<IEnumerable<int>> lists = bigList;
return lists
.Where(c => c != null && c.Any())
.Aggregate(Enumerable.Intersect)
.ToList().Count > 0;
}
}
public class Range
{
public int FromNumber { get; set; }
public int ToNumber { get; set; }
}
解决方法
首先合并数字,然后检查生成的列表是按排序顺序：
rangeList
.OrderBy(p => p.FromNumber)
.Select(p => new[] { p.FromNumber,p.ToNumber })
.SelectMany(p => p)
.Aggregate((p,q) => q >= p ? q : int.MaxValue) == int.MaxValue
