过滤和组合数组中的数据

Posted 2023-04-12

【中文标题】过滤和组合数组中的数据

【英文标题】：Filtering and combining data in an array

【发布时间】：2020-11-03 16:42:12

【问题描述】：

我有一个数组：

"Items":[
"folder":"Test","number":"11",
"folder":"Test","number":"10",
"folder":"Test1","number":"130",
"folder":"Test1","number":"100",
"folder":"Test2","number":"",
"folder":"Test2","number":"200"
]

告诉我我需要使 文件夹 是唯一的，并将其值写在 number 中，用逗号分隔？

"Items":[
"folder":"Test","number":"11, 10",
"folder":"Test1","number":"130, 100",
"folder":"Test2","number":"200"
]

【参考方案1】：

您可以使用GroupBy 按文件夹分组，使用String.Join() 连接数字，例如：

var result = Items
    .GroupBy(x => x.folder)
    .Select(x => new 
    
        folder = x.Key,
        number = string.Join(",", x.Select(y => y.number).Where(z => !string.IsNullOrEmpty(z)))
    ).ToList();

在 dotnetfiddle 中测试：https://dotnetfiddle.net/FDvSmc