从List <KeyValuePair<string,string >>返回匹配的项目,可以使用LINQ查询。以下是一个C#代码示例: 代码语言:csharp 复制 usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;classProgram{staticvoidMain(string[]args){List<KeyValuePair<string,string>>list=newList<KeyValuePair<string,string>>...
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C# LINQ List<KeyValuePair<string, KeyValuePair<int, int>>> Group by to List<KeyValuePair<string, List<KeyValuePair<int, int>>> C# LINQ one condition, return multiple columns and rows C# LINQ order by not working for a SQL table with a primary key C# LinQ query to pull top 3 re...
string str = Console.ReadLine(); listkey.Add(new KeyValuePair<string, string>(name, str)); Console.WriteLine("成功"); break; case 2: Console.WriteLine("请输入查找的姓名:"); string nameQuery = Console.ReadLine(); Console.WriteLine(); if (listkey) { Console.WriteLine(nameQuery + " " ...
List<string> stringList = new List<string> { "A", "B", "C", "D" }; 使用LINQ查询和更新List<string>中的值。下面是一些常见的例子: 更新特定索引位置的值: 代码语言:txt 复制 stringList[0] = "New Value"; 使用LINQ查询并更新符合条件的值: ...
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; } ...
TypeScript Copy function keyValuePair(): KeyValuePairContext[] Returns KeyValuePairContext[] keyValuePair(number) TypeScript Copy function keyValuePair(i: number): KeyValuePairContext Parameters i number Returns KeyValuePairContext Inherited Method Details...
foreach(KeyValuePair<int,string> kvpindictionary) {//输出遍历到的键值对集合元素的键和值Console.WriteLine("key={0},value={1}", kvp.Key, kvp.Value); } (4)遍历Keys(键) foreach(intjindictionary.Keys) {//输出遍历到的键值对元素的键Console.WriteLine("key={0},value={1}", j, dictionary...
foreach (string value in dic.Values) { Console.WriteLine ("value is " + value); } foreach (KeyValuePair item in dic) { Console.WriteLine ("key is " + item.Key); Console.WriteLine ("value is " + item.Value); } 3、使用while遍历字典(Dictionary)Dictionary dic = ...
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