ASP.NET Core读取配置文件

配置系统1-入门：
https://www.bilibili.com/video/BV1pK41137He?vd_source=b7200d0eaee914e9c128dcabce5df118&p=40&spm_id_from=333.788.videopod.episodes
配置系统2-选项方式读取：
https://www.bilibili.com/video/BV1pK41137He?vd_source=b7200d0eaee914e9c128dcabce5df118&spm_id_from=333.788.videopod.episodes&p=41
配置系统3-其他配置提供者：
https://www.bilibili.com/video/BV1pK41137He?vd_source=b7200d0eaee914e9c128dcabce5df118&spm_id_from=333.788.videopod.episodes&p=42
配置系统4-开发自己的配置提供者：
https://www.bilibili.com/video/BV1pK41137He?vd_source=b7200d0eaee914e9c128dcabce5df118&spm_id_from=333.788.videopod.episodes&p=43
配置系统5-开发数据库配置提供者
https://www.bilibili.com/video/BV1pK41137He?vd_source=b7200d0eaee914e9c128dcabce5df118&spm_id_from=333.788.videopod.episodes&p=44
配置系统6-多配置源的优先级
https://www.bilibili.com/video/BV1pK41137He?vd_source=b7200d0eaee914e9c128dcabce5df118&spm_id_from=333.788.videopod.episodes&p=45

读取

新建控制台程序

添加测试用的配置文件，设置属性

https://images.cnblogs.com/cnblogs_com/blogs/838411/galleries/2448086/t_250306151340_Pasted image 20250306221416.png

安装Microsoft.Extensions.Configuration和Microsoft.Extensions.Configuration.Json

编写如下代码(这里我使用了顶级语句)：

// See https://aka.ms/new-console-template for more information
using Microsoft.Extensions.Configuration;

ConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddJsonFile("config.json", optional: false, reloadOnChange: false);
IConfigurationRoot configurationRoot = configurationBuilder.Build();
string name = configurationRoot["name"];
Console.WriteLine($"name = {name}");
string proxyAddress = configurationRoot.GetSection("proxy:address").Value;
Console.WriteLine($"address={proxyAddress}");

运行代码查看结果:

浅析代码：

configurationBuilder.AddJsonFile("config.json", optional: false, reloadOnChange: false):

• 添加了一个待解析的名为”config.json“的配置文件，
• optional:表示这个文件是否可选，false意味着配置文件不存在时候会报错
• reloadOnChange:表示如果文件修改了，是否重新加载配置

测试上述的属性：

1、config.json改为config1.json

2、config.json改为config1.json && optional: true

3、reloadOnChange: true

需要修改代码持续的打印在控制台上，然后修改配置文件 修改的代码参考下面的;

// See https://aka.ms/new-console-template for more information
using Microsoft.Extensions.Configuration;


await Task.Run(async () =>
{
    while (true)
    {
        ConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
        configurationBuilder.AddJsonFile("config.json", optional: false, reloadOnChange: true);
        IConfigurationRoot configurationRoot = configurationBuilder.Build();
        string name = configurationRoot["name"];
        Console.WriteLine($"name = {name}");
        string proxyAddress = configurationRoot.GetSection("proxy:address").Value;
        Console.WriteLine($"address={proxyAddress}");
        await Task.Delay(2000);
    }
});

去修改配置文件

！！！发现并没有更新

去看作者的视频发现：