.NET Core 3.x 控制檯應用呼叫 IConfiguration 和 依賴注入
阿新 • • 發佈:2021-10-28
.NET Core 3.x 控制檯應用呼叫 IConfiguration 和 依賴注入
IConfiguration
IConfiguration
有兩個包
Microsoft.Extensions.Configuration
Microsoft.Extensions.Configuration.Json
具體使用
先建立 appsettings.json
,注意兩個選項
這個 Json 檔案內容
{ "RabbitMQ": { "HostName": "192.168.0.151", "Port": "5672", "Administrator": { "Username": "administrator", "Password": "123456" } } }
然後是建立物件,兩種方法
方法一
private static IConfiguration _configuration = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json").Build();
方法二
private static IConfiguration _configuration = new ConfigurationBuilder().AddJsonFile("appsettings.json").Build();
完整程式碼
class Program { private static IConfiguration _configuration = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json").Build(); static void Main(string[] args) { Console.WriteLine(Program._configuration["RabbitMQ:HostName"]); } }
執行結果
依賴注入
新增一個包
Microsoft.Extensions.DependencyInjection
這個配置就很簡單了,根據ASP.NET Core
的寫
IServiceCollection services = new ServiceCollection();
舉個例子,IConfiguration
的依賴注入
IServiceCollection services = new ServiceCollection();
services.AddSingleton<IConfiguration>(serviceProvider =>
{
IConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddJsonFile("appsettings.json");
return configurationBuilder.Build();
});
建立物件
IConfiguration configuration = services.BuildServiceProvider().GetService<IConfiguration>();
Console.WriteLine(configuration["RabbitMQ:HostName"]);
執行結果
配置普通類
這個就跟ASP.NET Core
一樣了
比如我有一個Test
類,你也可以先寫一個介面,再寫一個類
public class Test
{
private readonly IConfiguration _configuration;
public Test(IConfiguration configuration)
{
this._configuration = configuration;
}
public void Foo()
{
Console.WriteLine(this._configuration["RabbitMQ:HostName"]);
}
}
配置只有一句
services.AddSingleton<Test>();
完整程式碼
static void Main(string[] args)
{
IServiceCollection services = new ServiceCollection();
services.AddSingleton<IConfiguration>(serviceProvider =>
{
IConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddJsonFile("appsettings.json");
return configurationBuilder.Build();
});
services.AddSingleton<Test>();
Test t = services.BuildServiceProvider().GetService<Test>();
t.Foo();
}
執行結果
如果需要在其它類中呼叫容器,只需要將IServiceProvider serviceProvider
作為引數傳遞即可,或者作為靜態欄位寫類裡面,單例模式也行
當然,也可以用AutoFac
,C# 自帶的容器也可以,使用方式基本一致