(83) C# .net core 配置系统

  

配置文件有多种读取方式

先引用，再根据不同的源添加不同的读取方式

Microsoft.Extensions.Configuration

 

一、读取json文件

再添加

Microsoft.Extensions.Configuration.Json

 创建一个config.json文件，文件名可以随意.

{
  "name": "tom",
  "age": "18",
  "proxy": {"address":"china"}
}

 

文件属性设置成，如果比较新则复制

1.读取配置文件程序

using Microsoft.Extensions.Configuration;

ConfigurationBuilder configBuilder = new ConfigurationBuilder();
//第一个参数要读取文件名
//optional 没有该文件则不报错，默认false。
//reloadOnChange 修改文件后，是否立即读取默认false。无需重启程序
configBuilder.AddJsonFile("config.json", optional: false, reloadOnChange: true);
IConfigurationRoot config = configBuilder.Build();
string name = config["name"];
Console.WriteLine(name);

 

测试不重启的情况下，修改配置文件

ConfigurationBuilder configBuilder = new ConfigurationBuilder();
//第一个参数要读取文件名
//optional 没有该文件则不报错，默认false。
//reloadOnChange 修改文件后，是否立即读取默认false。无需重启程序
configBuilder.AddJsonFile("config.json", optional: false, reloadOnChange: true);
IConfigurationRoot config = configBuilder.Build();
while (true)
{
    Proxy proxy = config.GetSection("proxy").Get<Proxy>();
    Console.WriteLine(proxy.Address);
    Thread.Sleep(3000);
}

即时修改

 

 

2.读取多节点

string name = config.GetSection("proxy:address").Value;

 3.绑定成类

Microsoft.Extensions.Configuration.Binder

程序

using Microsoft.Extensions.Configuration;

ConfigurationBuilder configBuilder = new ConfigurationBuilder();
//第一个参数要读取文件名
//optional 没有该文件则不报错，默认false。
//reloadOnChange 修改文件后，是否立即读取默认false。无需重启程序
configBuilder.AddJsonFile("config.json", optional: false, reloadOnChange: true);
IConfigurationRoot config = configBuilder.Build();
Proxy proxy = config.GetSection("proxy").Get<Proxy>();
Console.WriteLine(proxy);

public class Proxy
{
    public string Address { get; set; }
}

 

3.结合依赖注入

需要引入

Microsoft.Extensions.Configuration.Binder
Microsoft.Extensions.Options

 三种方式 

3.1 不会读配置文件的新值

IOptions<T>

 

3.2 立即读配置文件的新值

IOptionsMonitor<T> 

Program.cs

using ConsoleTest;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

ConfigurationBuilder configBuilder = new ConfigurationBuilder();
configBuilder.AddJsonFile("config.json", optional: true, reloadOnChange: true);
IConfigurationRoot configRoot = configBuilder.Build();

ServiceCollection services = new ServiceCollection();
services.AddTransient<Test>();

//把Proxy绑定到根节点
services.AddOptions().Configure<Proxy>(e => configRoot.GetSection("proxy").Bind(e));

while (true)
{
    var serviceProvider = services.BuildServiceProvider();
    var test = serviceProvider.GetService<Test>();
    test.ok();
    Thread.Sleep(3000);
}

Console.ReadKey();
public class Proxy
{
    public string Address { get; set; }
}

Test.cs

using Microsoft.Extensions.Options;

namespace ConsoleTest
{
    public class Test
    {
        //即时读取
        private readonly IOptionsMonitor<Proxy> optionsMonitor;
        public Test(IOptionsMonitor<Proxy> optionsMonitor)
        {
            this.optionsMonitor = optionsMonitor;
        }

        public void ok()
        {
            var config = optionsMonitor.CurrentValue;
            Console.WriteLine(config.Address);
        }
    }
} 

 可以同时绑定多个对象

ConfigurationBuilder configBuilder = new ConfigurationBuilder();
configBuilder.AddJsonFile("config.json", optional: true, reloadOnChange: true);
IConfigurationRoot configRoot = configBuilder.Build();

ServiceCollection services = new ServiceCollection();
services.AddTransient<Test>();
//同时注入test2
services.AddTransient<Test2>();
//把Proxy绑定到根节点
services.AddOptions()
    //绑定整个配置文件
    .Configure<Config>(e => configRoot.Bind(e))
    //绑定某个节点
    .Configure<Proxy>(e => configRoot.GetSection("proxy").Bind(e));

while (true)
{
    var serviceProvider = services.BuildServiceProvider();
    var test = serviceProvider.GetService<Test>();
    var test2 = serviceProvider.GetService<Test2>();
    test.ok();
    test2.ok();
    Thread.Sleep(3000);
}

Console.ReadKey();
public class Proxy
{
    public string Address { get; set; }
}

public class Config
{
    public string name { get; set; }
    public int age { get; set; }
    public Proxy proxy { get; set; }
}

Test2.cs

    internal class Test2
    {
        private readonly IOptionsMonitor<Config> optionsMonitor;
        public Test2(IOptionsMonitor<Config> optionsMonitor)
        {
            this.optionsMonitor = optionsMonitor;
        }

        public void ok()
        {
            var config = optionsMonitor.CurrentValue;
            Console.WriteLine(config.age);
        }
    }

 

3.3  一定范围内会读取配置文件新值(如asp.net core 一次请求)

 

二、从命令行读取

Microsoft.Extensions.Configuration.CommandLine

 

class Program
{
    static void Main(string[] args)
    {
        ConfigurationBuilder configBuilder = new ConfigurationBuilder();
        //设置读取命令行
        configBuilder.AddCommandLine(args);
        IConfigurationRoot config = configBuilder.Build();
        string name = config["name"];
        Console.WriteLine(name);
    }
}

运行命令行

//命令行可以运行多种方式
ConsoleTest.exe name=tom
ConsoleTest.exe --name tom
ConsoleTest.exe --name=tom
ConsoleTest.exe /name tom
ConsoleTest.exe /name=tom

 

 

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