Microsoft.Extensions.Configuration 的 reloadOnChange 如何用于 appsettings.json

使用 Microsoft.Extensions.Configuration 的 reloadOnChange 实现 appsettings.json 的动态加载和更新

csharp
using Microsoft.Extensions.Configuration;
using System;
class Program
{
    static void Main(string[] args)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
        var configuration = builder.Build();
        // 读取配置项
        var setting1 = configuration["Setting1"];
        var setting2 = configuration["Setting2"];
        Console.WriteLine($"Setting1: {setting1}");
        Console.WriteLine($"Setting2: {setting2}");
        // 模拟配置文件更改
        System.IO.File.WriteAllText("appsettings.json", @"{
            ""Setting1"": ""New Value1"",
            ""Setting2"": ""New Value2""
        }");
        // 重新读取配置项
        setting1 = configuration["Setting1"];
        setting2 = configuration["Setting2"];
        Console.WriteLine($"Updated Setting1: {setting1}");
        Console.WriteLine($"Updated Setting2: {setting2}");
    }
}