如何在 C# 中将字典的内容复制到新字典

假设您希望它们是单独的对象，而不是对同一对象的引用，则将源字典传递到目标的构造函数中：

Dictionary<string, string> d = new Dictionary<string, string>();
Dictionary<string, string> d2 = new Dictionary<string, string>(d);

"这样它们就不是同一个对象了。"

歧义比比皆是 - 如果您确实希望它们成为对同一对象的引用：

Dictionary<string, string> d = new Dictionary<string, string>();
Dictionary<string, string> d2 = d;

（在上述之后更改d或d2都会影响两者）

using System;
using System.Collections.Generic;
class Program
{
    static void Main(string[] args)
    {
        Dictionary<string, string> first = new Dictionary<string, string>()
        {
            {"1", "One"},
            {"2", "Two"},
            {"3", "Three"},
            {"4", "Four"},
            {"5", "Five"},
            {"6", "Six"},
            {"7", "Seven"},
            {"8", "Eight"},
            {"9", "Nine"},
            {"0", "Zero"}
        };
        Dictionary<string, string> second = new Dictionary<string, string>();
        foreach (string key in first.Keys)
        {
            second.Add(key, first[key]);
        }
        first["1"] = "newone";
        Console.WriteLine(second["1"]);
    }
}

Amal回答的单行版本：

var second = first.Keys.ToDictionary(_ => _, _ => first[_]);