ASP.NET Core 類庫中取讀配置文件 appsettings.json

首先引用NuGet包

Microsoft.Extensions.Configuration
Microsoft.Extensions.Configuration.Json
Microsoft.Extensions.DependencyInjection
Microsoft.Extensions.Options
Microsoft.Extensions.Options.ConfigurationExtensions

 

咱們先來看一下appsettings.json文件

{
  "Logging": {
    "IncludeScopes": false,
    "Debug": {
      "LogLevel": {
        "Default": "Warning"
      }
    },
    "Console": {
      "LogLevel": {
        "Default": "Warning"
      }
    }
  },
  "AppSupportDatabase": {
    "ConnectionString": "server=.;initial catalog=TestDB;user id=sa;password=123",
    "ProviderName": "System.Data.SqlClient"
  }
}

咱們想取ProviderName怎麼辦呢？首先新建ConfigManager

public class ConfigManager
  {
      public string ProviderName { get; set; }

      public string ConnectionString { get; set; }
  }

GetAppsettings方法

public T GetAppsettings<T>(string key) where T : class, new()
 {
     string keyDir = System.IO.Directory.GetCurrentDirectory();

     IConfiguration config = new ConfigurationBuilder()
         .SetBasePath(keyDir)
         .Add(new JsonConfigurationSource { Path = "appsettings.json", ReloadOnChange = true })
         .Build();
     var appconfig = new ServiceCollection()
         .AddOptions()
         .Configure<T>(config.GetSection(key))
         .BuildServiceProvider()
         .GetService<IOptions<T>>()
         .Value;
     return appconfig;
 }

調用例子

GetAppsettings<ConfigManager>("AppSupportDatabase").ProviderName

 

出處：https://www.studenty.cn/?p=1094

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須要先引用官方的nuget包

①：Microsoft.Extensions.Configuration

②：Microsoft.Extensions.Options.ConfigurationExtensions

用戶自定義json的配置文件

在這裏我用的配置文件名稱是appsettings.json

配置文件內容如圖所示：

在Startup類中的Startup方法中編輯代碼，我先把代碼貼出來吧：

var builder = new ConfigurationBuilder()

.SetBasePath(env.ContentRootPath)

.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)

.AddEnvironmentVariables();

Configuration = builder.Build();

var connString = new ConnectionStrings();

Configuration.GetSection("ConnString").Bind(connString);

在代碼中 ConnectionStrings類是一個Model，而後你建立的變量connString已經被實例化了。你能夠訪問了

做者：奧斯卡的肌膚 連接：https://www.jianshu.com/p/a13a0194ff91 來源：簡書 簡書著做權歸做者全部，任何形式的轉載都請聯繫做者得到受權並註明出處。