Question

Answer 1

您应该可以使用LINQ和IEnumerable<double>的自定义IComparer来完成此操作。

public class EnumerableDoubleComparer : IComparer<IEnumerable<double>>
{
    public int Compare( IEnumerable<double> a, IEnumerable<double> b )
    {
        var counts = a.Select( (k,i) => new { Value = k, Index = i } )
                      .Join( b.Select( (k,i) => new { Value = k, Index = i } ),
                             outer => outer.Index,
                             inner => inner.Index,
                             (outer,inner) => outer.Value > inner.Value
                                                  ? "A"
                                                  : (inner.Value > outer.Value
                                                        ? "B"
                                                        : "" ) )
                      .GroupBy( listID => listID )
                      .Select( g => new { g.Key, Count = g.Count() } );

        // you could also use SingleOrDefault on the collection and check for null
        var aCount = counts.Where( c => c.Key == "A" )
                           .Select( c => c.Count )
                           .SingleOrDefault();
        var bCount = counts.Where( c => c.Key == "B" )
                           .Select( c => c.Count )
                           .SingleOrDefault();

        return aCount - bCount;
    }
}

用作：

var a = new double[] { 1, 1 };
var b = new double[] { 2, 2 };
var c = new double[] { 3, 3 };

var lists = new List<IEnumerable<double>> { a, c, b };

var ordered = lists.OrderByDescending( l => l, new EnumerableDoubleComparer() );

9 个答案: