[英]Convert List<string> containing many-to-many relationship items into one-to-many relationship
I have a List that contains strings which are delimited by a ' ' The list serves to function as a list of many to many relationships:我有一个包含由“”分隔的字符串的列表,该列表作为多对多关系的列表提供给 function:
Category1 Item1
Category1 Item2
Category1 Item3
Category2 Item1
Category2 Item2
Category2 Item3
Category2 Item4
Category2 Item5
Category3 Item1
I need to convert this list into one which has a one to many relationship order, with the items separated by a ';'我需要将此列表转换为具有一对多关系顺序的列表,其中项目由“;”分隔example:
例子:
Category1 Item1;Item2;Item3
Category2 Item1;Item2;Item3;Item4;Item5
Category3 Item1
I have multiple foreach loops right now.我现在有多个 foreach 循环。 I would love to share with you the many methods I've tried but it's truly a mess.
我很乐意与您分享我尝试过的许多方法,但这确实是一团糟。 However, something tells me there might be a Lambda technique to achieve this.
但是,有些事情告诉我可能有一种 Lambda 技术来实现这一点。 Can anyone point me in the right direction?
谁能指出我正确的方向? Thanks
谢谢
var items = new List<string> {
"Category1 Item1",
"Category1 Item2",
"Category1 Item3",
"Category2 Item1",
"Category2 Item2",
"Category2 Item3",
"Category2 Item4",
"Category2 Item5",
"Category3 Item1"
};
var result = items.Select(x => x.Split(' '))
.Select(x => new {
Category = x[0],
Item = x[1]
})
.GroupBy(x => x.Category, y => y.Item, (k, e) => string.Join(";", e))
.ToList();
Console.ReadLine();
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