使用LINQ

Question

分組核心價值詞典列表在C＃我有以下List<Dictionary<string, string>>密鑰對：

我怎麼會寫我的Linq查詢，這樣我只有1個字典，其中值分組按鍵？

Answer 1

var result = data.SelectMany(item => item) 
    .GroupBy(item => item.Key) 
    .ToDictionary(key => key.Key, value => value.Select(i => i.Value).ToList()); 

對於給定的輸入：

List<Dictionary<string, string>> data = new List<Dictionary<string, string>> 
{ 
    new Dictionary<string, string> 
    { 
     ["Category"] = "99", 
     ["Role"] = "11", 
     ["Level"] = "22", 
     ["BillaleDays"] = "33", 
    }, 
    new Dictionary<string, string> 
    { 
     ["Category"] = "55", 
     ["Role"] = "66", 
     ["Level"] = "77", 
     ["BillaleDays"] = "88", 
    } 
}; 

結果是：

Category : (99,55) 
Role : (11,66) 
Level : (22,77) 
BillableDays : (33,88) 

Answer 2

List<Dictionary<string, string>> data = new List<Dictionary<string,string>> 
{ 
    new Dictionary<string, string> 
    {   
     ["Name"] = "one", 
     ["Age"] = "22" 
    }, 
    new Dictionary<string, string> 
    { 
     ["Name"] = "two", 
     ["Age"] = "88", 
    } 
}; 

var result = data.SelectMany(item => item) 
       .GroupBy(item => item.Key) 
       .ToDictionary(key => key.Key, value => value.Select(i => i.Value).ToList()); 

輸出： Name:"one,"two", Age:"22","88"