.net core config读取

it2022-06-24  81

最简单的方式

引用

Microsoft.Extensions.Configuration Microsoft.Extensions.Configuration.Json

json文件

新建一个ConfigTest.json右键属性,设置为“始终复制”数据如下:

{ "TotalCount": 2, "Students": [ { "Name": "Lili", "Sex": "女" }, { "Name": "Tom", "Sex": "男" } ] }

读取json

var builder = new ConfigurationBuilder(); builder.AddJsonFile("ConfigTest.json"); var config = builder.Build(); Console.WriteLine(config["TotalCount"]); //索引 Console.WriteLine(config["Students:0:Name"]); Console.WriteLine(config["Students:0:Sex"]); Console.WriteLine(config["Students:1:Name"]); Console.WriteLine(config["Students:1:Sex"]);

示例代码

https://github.com/zLulus/NotePractice/blob/dev3/Website/DotNetCore/CoreConsole/Config/ConfigReadDemo.cs 的ReadConfig方法

Bind读取配置

引用

第一个示例中的引用也要添加

Microsoft.Extensions.Configuration.Binder

读取json

var builder = new ConfigurationBuilder() .AddJsonFile("ConfigTest.json"); ConfigTest configTest=new ConfigTest(); var config = builder.Build(); //Microsoft.Extensions.Configuration.Binder config.Bind(configTest); Console.WriteLine(configTest.TotalCount); Console.WriteLine(configTest.Students[0].Name); Console.WriteLine(configTest.Students[0].Sex); Console.WriteLine(configTest.Students[1].Name); Console.WriteLine(configTest.Students[1].Sex);

示例代码

https://github.com/zLulus/NotePractice/blob/dev3/Website/DotNetCore/CoreConsole/Config/ConfigReadDemo.cs 的ReadConfigByBind方法

Option

引用

第一个示例中的引用也要添加

Microsoft.Extensions.Options

在appsettings.json中添加测试数据

{ "MyData": { "TotalCount": 2, "Students": [ { "Name": "Lili", "Sex": "女" }, { "Name": "Tom", "Sex": "男" } ] } }

实体类需要实现IOptions<T>

public class ConfigTest:IOptions<ConfigTest> { public int TotalCount { get; set; } public List<Student> Students { get; set; } public ConfigTest Value => this; }

读取json

public class ConfigController : Controller { private ConfigTest _configTestByOptions; private readonly IConfiguration _configuration; public ConfigController(IConfiguration configuration) { _configuration = configuration; } public IActionResult Index() { //GetSection:必须先读节点 //ConfigTest实现接口IOptions<ConfigTest> _configTestByOptions = _configuration.GetSection("MyData").Get<ConfigTest>(); return View(); } }

注意

CreateDefaultBuilder方法已经读取appsettings.json,所以在这个示例中,我们没有调用AddJsonFile方法添加appsettings.json文件,而是直接读取appsettings.json中的数据即可

public static IWebHost BuildWebHost(string[] args) => WebHost.CreateDefaultBuilder(args) .UseStartup<Startup>() .Build();

示例代码

https://github.com/zLulus/NotePractice/blob/dev3/Website/DotNetCore/CoreWebsite/Controllers/ConfigController.cs

热更新

定义

optional:该配置文件是否可选,如果optional=false,加载失败会抛出异常reloadOnChange:文件被修改时是否重新加载,热更新就是这个,设置为true即可

public static IConfigurationBuilder AddJsonFile(this IConfigurationBuilder builder, string path, bool optional, bool reloadOnChange)

注意,热更新是修改bin目录下的生成的文件

示例代码

https://github.com/zLulus/NotePractice/blob/dev3/Website/DotNetCore/CoreConsole/Config/ConfigReadDemo.cs 的ReadConfigHotUpdate方法

转载于:https://www.cnblogs.com/Lulus/p/8254144.html

相关资源:C# .NET 读取更新Config文件

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