c#之如何使用 LINQ 从 map 中的列表中进行选择

我正在尝试从存储在字典中的列表中选择特定元素。

internal Dictionary<string, List<Teamkill>> teamkillCounter = new Dictionary<string, List<Teamkill>>(); 
 
class Teamkill 
{ 
    public string killerName; 
    public string killerSteamId; 
    public TeamRole killerTeamRole; 
    public string victimName; 
    public string victimSteamId; 
    public TeamRole victimTeamRole; 
    public DamageType damageType; 
} 
 
// quotedArgs[1] is the killer name being searched for 
 
// First attempt 
List<Teamkill> teamkills = this.plugin.teamkillCounter.Select(x => x.Value.Select(y => y.killerName.Contains(quotedArgs[1])).Cast<List<Teamkill>>()).Cast<List<Teamkill>>().Single(); 
 
// Second attempt 
List<Teamkill> teamkills = new List<Teamkill>(); 
teamkills = this.plugin.teamkillCounter.Values.SelectMany(x => x).ToList(); 
teamkills = teamkills.Where(y => y.killerName.Contains(quotedArgs[1])).ToList(); 

理想情况下，它应该返回与 killer 姓名匹配的所有 Teamkills 的列表。

请您参考如下方法:

如果我了解您想要的结果，您可能只需使用 Values , SelectMany 和 Where .

var result = teamkillCounter.SelectMany(x => x.Value.Where(y => y.killerName.Contains("bobo"))); 

Dictionary<TKey,TValue>.Values Property

Gets a collection containing the values in the Dictionary.

Enumerable.SelectMany Method

Projects each element of a sequence to an IEnumerable<T> and flattens the resulting sequences into one sequence.