在 C# 中自定义通用数字文本比较器来排序 numeric/string 列表？

Question

我想创建一个与中描述的类似的数字文本比较器。

public class NumberTextComparer : IComparer<string>
    {
        public int Compare(string s1, string s2)
        {
            double number1, number2;
            var isS1Numeric = double.TryParse(s1, out number1);
            var isS2Numeric = double.TryParse(s2, out number2);

            if (isS1Numeric && isS2Numeric)
            {
                if (number1 > number2) return 1;
                if (number1 < number2) return -1;
                return 0;
            }
            if (isS1Numeric)
                return 1;
            if (isS2Numeric)
                return -1;

            bool s1StartsWithLetter = char.IsLetter(s1.FirstOrDefault());
            bool s2StartsWithLetter = char.IsLetter(s2.FirstOrDefault());

            if (s1StartsWithLetter == s2StartsWithLetter)
                return String.Compare(s1, s2, StringComparison.OrdinalIgnoreCase);
            if (s1StartsWithLetter)
                return -1;
            return 1;
        }
    }

var numericList = new List<string>{"100", "--", "-0.98", "N/A", "0.00", "-888"};
var stringList = new List<string> {"Smith", "--", "Peter", "", "Jim", "Ken", "NA"};

Console.WriteLine(String.Join(", ", numericList.OrderBy(v => v, new NumberTextComparer())));
Console.WriteLine(String.Join(", ", stringList.OrderBy(v => v, new NumberTextComparer())));

给出以下输出：

N/A, --, -888, -0.98, 0.00, 100
吉姆、肯、NA、彼得、史密斯、--

但我希望在字符串排序中："" 或 -- 应该按升序排在第一位而不是最后一位。数字排序除外。

因此预期结果将是：

数字升序排序 -> N/A, --,-888, -0.98, 0.00, 100
字符串升序排序 -> , --, Jim, Ken, NA, Peter, Smith

有可能实现吗？

Answer 1

据我了解，对于数字和字符串数据，您需要 2 种不同的排序行为。因此，您可以通过传递所需类型来实现此目的，如下所示-

 public enum SortColumnType
 {
        Numeric=1,
        String=2
 }

public class NumberTextComparer : IComparer<string>
    {
        public SortColumnType ColumnType { get; set; }

        public NumberTextComparer(SortColumnType columnType)
        {
            ColumnType = columnType;
        }

        private int CustomNumberSort(string s1, string s2)
        {
            double number1, number2;
            var isS1Numeric = double.TryParse(s1, out number1);
            var isS2Numeric = double.TryParse(s2, out number2);

            if (isS1Numeric && isS2Numeric)
            {
                if (number1 > number2) return 1;
                if (number1 < number2) return -1;
                return 0;
            }
            if (isS1Numeric)
                return 1;
            if (isS2Numeric)
                return -1;

            var s1StartsWithLetter = !string.IsNullOrEmpty(s1) && char.IsLetterOrDigit(s1[0]);
            var s2StartsWithLetter = !string.IsNullOrEmpty(s2) && char.IsLetterOrDigit(s2[0]);

            if (s1StartsWithLetter == s2StartsWithLetter)
                return String.Compare(s1, s2, StringComparison.OrdinalIgnoreCase);
            if (s1StartsWithLetter)
                return -1;
            return 1;
        }

        public int Compare(string s1, string s2)
        {
            return ColumnType.Equals(SortColumnType.Numeric)
                ? CustomNumberSort(s1, s2)
                : String.Compare(s1, s2, StringComparison.OrdinalIgnoreCase);
        }
    }

stringList.OrderBy(str => str, new NumberTextComparer(SortColumnType.String));
numericList.OrderBy(str => str, new NumberTextComparer(SortColumnType.Numeric));

在 C# 中自定义通用数字文本比较器来排序 numeric/string 列表？

Custom common number-text comparer in C# to sort numeric/string list?

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