C#打印字典内容

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        // 创建一个字典
        Dictionary<string, int> myDictionary = new Dictionary<string, int>
        {
            { "apple", 1 },
            { "banana", 2 },
            { "cherry", 3 }
        };

        // 打印字典内容
        foreach (KeyValuePair<string, int> kvp in myDictionary)
        {
            Console.WriteLine($"Key = {kvp.Key}, Value = {kvp.Value}");
        }
    }
}

Key = apple, Value = 1
Key = banana, Value = 2
Key = cherry, Value = 3

if (!myDictionary.ContainsKey("apple"))
{
    myDictionary.Add("apple", 1);
}

if (myDictionary.Count > 0)
{
    // 执行操作
}

using System.Collections.Concurrent;

ConcurrentDictionary<string, int> concurrentDictionary = new ConcurrentDictionary<string, int>();

concurrentDictionary.TryAdd("apple", 1);