Question

我有以下测试失败：

[TestCase]
public void Should_order_numeric_suffix()
{
    var names = new List<string>
                    {
                        "Buisness Unit 7",
                        "Business Unit 1",
                        "Buisness Unit 3",
                        "Business Unit 6",
                        "Business Unit 4",
                        "Buisness Unit 2",
                        "Business Unit 5"
                    };

    List<string> ordered = names.OrderBy(x => x).ToList();

    Assert.That(ordered[0], Is.EqualTo("Business Unit 1"));
}

有序列表的实际顺序是：

Business Unit 2
Business Unit 3
Business Unit 7
Business Unit 1
Business Unit 4
Business Unit 5
Business Unit 6

显然，它按字母顺序正确排序，但我希望也可以订购数字后缀。

Answer 1

您的列表中存在拼写错误，有些条目拼写为“商务”而不是“商务”......而“商务”则按字母顺序排在“商务”之前

Answer 2

您正在寻找自然排序顺序，默认情况下不会在GroupBy中实现您需要实现自定义IComparer。

当然那些已经存在，例如：

http://www.interact-sw.co.uk/iangblog/2007/12/13/natural-sorting

http://zootfroot.blogspot.com/2009/09/natural-sort-compare-with-linq-orderby.html?showComment=1258020708758#c5034722582649839449

Answer 3

您可以尝试重写这样的查询：

List<string> ordered = (from n in names
                        orderby n
                        select n).ToList<string>();

意外的Linq OrderBy

3 个答案: