Dictionary.Add() 方法


Dictionary.Add() 方法用于向字典中添加指定键值。

语法

语法如下:

public void Add (TKey key, TValue val);

上述代码中,key 参数是键,而 Val 是元素值。

示例

现在,让我们看一个实现 Dictionary.Add() 方法的示例:

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      Dictionary<string, string> dict =
      new Dictionary<string, string>();
      dict.Add("One", "John");
      dict.Add("Two", "Tom");
      dict.Add("Three", "Jacob");
      dict.Add("Four", "Kevin");
      dict.Add("Five", "Nathan");
      Console.WriteLine("Key/value pairs...");
      foreach(KeyValuePair<string, string> res in dict){
         Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);
      }
   }
}

输出

将生成以下输出:

Key/value pairs...
Key = One, Value = John
Key = Two, Value = Tom
Key = Three, Value = Jacob
Key = Four, Value = Kevin
Key = Five, Value = Nathan

示例

现在,让我们看另一个实现 Dictionary.Add() 方法的示例:

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      Dictionary<string, string> dict =
      new Dictionary<string, string>();
      dict.Add("One", "John");
      dict.Add("Two", "Tom");
      dict.Add("Three", "Jacob");
      dict.Add("Four", "Kevin");
      dict.Add("Five", "Nathan");
      Console.WriteLine("Count of elements = "+dict.Count);
      dict.Add("Six", "Anne");
      dict.Add("Seven", "Katie");
      Console.WriteLine("Count of elements (updated) = "+dict.Count);
      Console.WriteLine("Key/value pairs...");
      foreach(KeyValuePair<string, string> res in dict){
         Console.WriteLine("Key = {0}, Value = {1}", res.Key, res.Value);
      }
   }
}

输出

将生成以下输出:

Count of elements = 5
Count of elements (updated) = 7
Key/value pairs...
Key = One, Value = John
Key = Two, Value = Tom
Key = Three, Value = Jacob
Key = Four, Value = Kevin
Key = Five, Value = Nathan
Key = Six, Value = Anne
Key = Seven, Value = Katie

更新于:2019 年 11 月 12 日

208 次浏览

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