在C＃数组中对字符串进行分组和计数

如何解决在C＃数组中对字符串进行分组和计数

假设我有以下字符串列表：

"1130-CD-001" 
"1130-CD-001A"
"1130-CD-001B"
"1130-CD-001C"
"1130-CD-002"
"1130-CD-002A"
"1130-CD-003"
"1130-CD-003A"
"1130-CD-003B"

如何在C＃中处理该列表以获取以下汇总

Item                Count
"1130-CD-001"           1
"1130-CD-001A,B,C"      3
"1130-CD-002"           1
"1130-CD-002A"          1
"1130-CD-003"           1
"1130-CD-003A,B"        2

提前谢谢！

解决方法

您可以将其转换为这样的字典：

var dict = list.GroupBy(x => Regex.Replace(x,@"[A-Z]+$","_"))
    .ToDictionary(
        grp => grp.Key
            .Replace("_",string.Join(",",grp.Select(x => Regex.Match(x,@"[A-Z]+$")))),grp => grp.Count());

Regex用_替换所有结尾的A-Z字符以创建分组。

然后通过将_替换为每个组中尾随A-Z字符的列表来创建密钥。

示例：https://dotnetfiddle.net/OTiRLE

,

由于您将非后缀与后缀分开分组的规则，这有点棘手-但这可行：

var result = input.GroupBy(x => char.IsLetter(x.Last()) ? (x.Substring(0,x.Length-1),true) : (x,false))
                .Select(g => new {
                    Text = g.Key.Item2 ? g.Key.Item1 + String.Join(",g.Select(x => x.Last())) : g.Key.Item1,Count = g.Count()
                });

实时示例：https://dotnetfiddle.net/CVgmRB

上面的方法是将其分组为一个看起来像(string Key,bool HasSuffix)的元组，然后使用该分组来投影所需的文本和计数。

,

检查

var list = new string[]{"1130-CD-001","1130-CD-001A","1130-CD-001B","1130-CD-001C","1130-CD-002","1130-CD-002A","1130-CD-003","1130-CD-003A","1130-CD-003B",};

list.Select(x => new { Orj = x,Base = x.Substring(0,11),Rest = x.Substring(11) })
    .GroupBy(x => new { Key1 = x.Base,Key2 = String.IsNullOrWhiteSpace(x.Rest)})
    .Select(x =>
    {  
        return new { x.Key.Key1,Val = String.Join(',',x.Select(p => p.Rest)) };
    })
    .Dump();