Dictionary.Add 与 Dictionary[key]=value 的区别[重复]

Dictionary.Add 与 Dictionary[key]=value 的区别

csharp
public void Add(TKey key, TValue value);

csharp
Dictionary dict = new Dictionary();
dict.Add("apple", 5);
dict.Add("banana", 3);
dict.Add("orange", 2);

csharp
public TValue this[TKey key] { get; set; }

csharp
Dictionary dict = new Dictionary();
dict["apple"] = 5;
dict["banana"] = 3;
dict["orange"] = 2;
dict["apple"] = 10; // 更新键为"apple"的值为10

csharp
using System;
using System.Collections.Generic;
class Program
{
    static void Main(string[] args)
    {
        Dictionary dict = new Dictionary();
        // 使用Add方法添加新的键值对
        try
        {
            dict.Add("apple", 5);
            dict.Add("banana", 3);
            dict.Add("orange", 2);
            dict.Add("apple", 10); // 尝试添加重复的键，会抛出异常
        }
        catch (ArgumentException ex)
        {
            Console.WriteLine("添加重复的键时发生异常：" + ex.Message);
        }
        // 使用Dictionary[key]=value的方式添加新的键值对
        dict["apple"] = 5;
        dict["banana"] = 3;
        dict["orange"] = 2;
        dict["apple"] = 10; // 更新键为"apple"的值为10
        Console.WriteLine("字典中的键值对：");
        foreach (var kvp in dict)
        {
            Console.WriteLine(kvp.Key + ": " + kvp.Value);
        }
    }
}