C#（二十七）：Dictionary

引用声明

using System.Collections.Generic; 
Dictionary<string, string> d = new Dictionary<string, string>();

特点

• 指定了key和value类型

d.Add("name", "Lee");
d.Add("age", "23");
//d.Add("age", 23); // Error 
d.Add("sex", "Male");

增

d.Add("name", "Lee");
d.Add("age", "23");
//d.Add("age", 23); // Error 
d.Add("sex", "Male");

查

foreach (object obj in d) {
    Console.WriteLine(obj);
    // [name, Lee]
    // [age, 23]
    // [sex, Male]
}

foreach (KeyValuePair<string, string> kvp in d) {
    Console.WriteLine(kvp);
    // [name, Lee]
    // [age, 23]
    // [sex, Male]
}

ICollection<string> keys = d.Keys;
foreach (string key in keys)
{
    Console.WriteLine($"{key} => {d[key]}");
    // name => Lee
    // age => 23
    // sex => Male
}

删

d.Remove("name");

foreach (object obj in d) {
    Console.WriteLine(obj);
    // [age, 23]
    // [sex, Male]
}