}//Linqvarkeys = dic.Where(q => q.Value =="2").Select(q => q.Key);//get all keysList<string> keyList = (fromqindicwhereq.Value =="2"selectq.Key).ToList<string>();//get all keysvarfirstKey = dic.FirstOrDefault(q => q.Value =="2").Key;//get first key}...
How to Get Values by Key in Dictionary in C# In C#, there are several methods for getting the values by key in the dictionary: 1: Using Index Operator You can use theindex operatorin C# to retrieve the value associated with a key in a dictionary and it can be done using the following...
dictionary get key by value Dictionary string with string as key and an integer array as value Dictionary Values to Lower Dictionary with limited size Dictionary with string array as key and a Dictionary as value. Dictionary<string, Dictionary<string, string>> not working as expected Dictionary<St...
C# Dictionary通过value获取对应的key值 2017-07-27 09:16 −1:最直白的循环遍历方法,可以分为遍历key--value键值对以及所有的key两种表现形式2:用Linq的方式去查询(当然了这里要添加对应的命名空间 using System.Linq) 如下为一个十分简单的代码示例: private void GetDicKeyByVa... ...
在C#中,Dictionary.Add和Dictionary[key]=value都是用于向字典中添加或更新键值对的方法,但它们之间有几个区别: Dictionary.Add方法会在向字典中添加键值对时检查键是否已经存在,如果键已经存在,会抛出一个异常(ArgumentException)。而Dictionary[key]=value则会直接覆盖已经存在的键的值,或者在键不存在时添加一个新的...
Dictionary<int, List<Hobby>> keyValuePairs = hobbyList.GroupBy<Hobby,int>(c => c.UserId).ToDictionary(c => c.Key, c => c.ToList()); 实际测试 namespaceConsAppTest {classUser {publicintId {get;set; }publicstringName {get;set; }publicint? Age {get;set; } ...
字典<TKey,TValue>。ValueCollection 字典<TKey,TValue>。ValueCollection 构造函数 属性 方法 显式接口实现 Dictionary<TKey,TValue> EqualityComparer<T> HashSet<T>。枚举 数 HashSet<T> IAsyncEnumerable<T> IAsyncEnumerator<T> ICollection<T>
Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]); // The indexer can be used to change the value associated // with a key. openWith["rtf"] = "winword.exe"; Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]); // If a key...
大家好,又见面了,我是全栈君 C#遍历Dictionary方法 Dictionary d = new Dictionary(); foreach (...Console.WriteLine("{0}, {1}", pair.Key, pair.Value...
This code example is part of a larger example provided for the Dictionary<TKey, TValue> class. C# 复制 // To get the values alone, use the Values property. Dictionary<string, string>.ValueCollection valueColl = openWith.Values; // The elements of the ValueCollection are strong...