C#中的包含键

2023-06-21 05:37:03 311

ContainsKey是C#中的Dictionary方法，用于检查字典中是否存在键。

声明字典并添加元素-

var dict = new Dictionary() {
   {"TV", 1},
   {"Home Theatre", 2},
   {"Amazon Alexa", 3},
   {"Google Home", 5},
   {"Laptop", 5},
   {"Bluetooth Speaker", 6}
};

现在，假设您需要检查字典中是否存在特定元素。为此，使用ContainsKey()方法-

if (dict.ContainsKey("Laptop") == true) {
   Console.WriteLine(dict["Laptop"]);
}

以下是代码-

示例

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main() {
      var dict = new Dictionary() {
         {"TV", 1},
         {"Home Theatre", 2},
         {"Amazon Alexa", 3},
         {"Google Home", 5},
         {"Laptop", 5},
         {"Bluetooth Speaker", 6}
      };
      if (dict.ContainsKey("Laptop") == true) {
         Console.WriteLine(dict["Laptop"]);
      }
      if (dict.ContainsKey("Amazon Alexa") == true) {
         Console.WriteLine(dict["Amazon Alexa"]);
      }
   }
}

输出结果

5
3

C#中的包含键

示例

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