LINQ選擇C＃字典

Question

我旁邊的字典在C＃

Dictionary<string, object> subDictioanry = new Dictionary<string, object>(); 

List<Dictionary<string, string>> subList = new List<Dictionary<string, string>>(); 
subList.Add(new Dictionary<string, string>(){ 
{"valueLink", "link1"}, 
{"valueTitle","title1"} 
}); 
subList.Add(new Dictionary<string, string>(){ 
{"valueLink", "link2"}, 
{"valueTitle","title2"} 
}); 
subList.Add(new Dictionary<string, string>(){ 
{"valueLink", "link3"}, 
{"valueTitle","title3"} 
}); 

subDictioanry.Add("title", "title"); 
subDictioanry.Add("name", "name"); 
subDictioanry.Add("fieldname1", subList); 

Dictionary<string, object> exitDictionary = new Dictionary<string, object>(); 
exitDictionary.Add("first", subDictioanry); 
exitDictionary.Add("second", subDictioanry); 

是否有可能讓所有「valueTitle」與LINQ的幫助下選擇？

UPDATE： 對不起，我應該是第一個寫 - 我需要得到源於exitDictionary，而不是從子列表

Answer 1

如果由搜索值，試試這個：

var r = exitDictionary 
    .Select(i => i.Value).Cast<Dictionary<string, object>>() 
    .Where(d => d.ContainsKey("fieldname1")) 
    .Select(d => d["fieldname1"]).Cast<List<Dictionary<string, string>>>() 
    .SelectMany(d1 => 
     d1 
     .Where(d => d.ContainsKey("valueTitle")) 
     .Select(d => d["valueTitle"]) 
     .Where(v => v != null)).ToList(); 

如果你是價值的subDictionary（Dictionary<string, object>明確）類型看，你可以這樣做：

var r = exitDictionary 
    .Select(i => i.Value).Cast<Dictionary<string, object>>() 
    .SelectMany(d=>d.Values) 
    .OfType<List<Dictionary<string, string>>>() 
    .SelectMany(d1 => 
     d1 
     .Where(d => d.ContainsKey("valueTitle")) 
     .Select(d => d["valueTitle"]) 
     .Where(v => v != null)).ToList(); 

兩個選擇將返回：

title1 
title2 
title3 
title1 
title2 
title3 

Answer 2

這將返回匹配您的鑰匙valueTitle

subList.SelectMany(m => m).Where(kvp => kvp.Key == "valueTitle").Select(k => k.Value).ToList(); 

Answer 3

一種方式，所有的值將是首先拼合與SelectMany名單：

subList.SelectMany(m => m).Where(k => k.Key.Equals("valueTitle"));