列出复杂排序
我有一个大小的List ，比如XS，S，M，L，XL，XXL，UK 10，UK 12等
我想要的是强制订单是上面的，无论列表中的项目顺序如何，我想我需要一个IComparable运算符，但不确定。
理想情况下，我想让另一个List具有正确的顺序，它可以在列表中引用它的’place’并重新排序，如果它不存在则默认为AZ
按照您希望它们的顺序创建一个大小的数组，然后按照它们在该数组中的大小位置对衬衫进行排序：
string[] sizes = new [] {"XS", "S", "M", "L", "XL", "XXL", "UK 10", "UK 12"}; var shirtsInOrder = shirts .OrderBy(s=>sizes.Contains(s) ? "0" : "1") // put unmatched sizes at the end .ThenBy(s=>Array.IndexOf(sizes,s)) // sort matches by size .ThenBy(s=>s); // sort rest AZ
var order = new string[] { "XS", "S", "M", "L", "XL", "XXL", "UK10", "UK12" }; var orderDict = order.Select((c, i) => new { sze = c, ord = i }) .ToDictionary(o => o.sze, o => o.ord); var list = new List { "S", "L", "XL", "L", "L", "XS", "XL" }; var result = list.OrderBy(item => orderDict[item]);
您可以直接使用OrderByDescending + ThenByDescending ：
sizes.OrderByDescending(s => s == "XS") .ThenByDescending( s => s == "S") .ThenByDescending( s => s == "M") .ThenByDescending( s => s == "L") .ThenByDescending( s => s == "XL") .ThenByDescending( s => s == "XXL") .ThenByDescending( s => s == "UK 10") .ThenByDescending( s => s == "UK 12") .ThenBy(s => s);
我使用...Descending因为true类似于1而false是0。
您还可以创建其他列表，并使用委托与排序一起使用，如果size1的索引> size2的索引则返回。
你也可以这样做：
public class ShirtComparer : IComparer { private static readonly string[] Order = new[] { "XS", "S", "M", "L", "XL", "XXL", "UK10", "UK12" }; public int Compare(string x, string y) { var xIndex = Array.IndexOf(Order, x); var yIndex = Array.IndexOf(Order, y); if (xIndex == -1 || yIndex == -1) return string.Compare(x, y, StringComparison.Ordinal); return xIndex - yIndex; } }
用法：
var list = new List { "S", "L", "XL", "L", "L", "XS", "XL", "XXXL", "XMLS", "XXL", "AM19" }; var result = list.OrderBy(size => size, new ShirtComparer());
对于不在列表中的值，它也应该默认为AZ …