ASP.NET Core class library fetch profile appsettings.json

First reference NuGet package

1. Microsoft.Extensions.Configuration  
2. Microsoft.Extensions.Configuration.Json  
3. Microsoft.Extensions.DependencyInjection  
4. Microsoft.Extensions.Options  
5. Microsoft.Extensions.Options.ConfigurationExtensions  

 

Let's look appsettings.json file

 

1. {  
2.   "Logging": {  
3.     "IncludeScopes": false,  
4.     "Debug": {  
5.       "LogLevel": {  
6.         "Default": "Warning"  
7.       }  
8.     },  
9.     "Console": {  
10.       "LogLevel": {  
11.         "Default": "Warning"  
12.       }  
13.     }  
14.   },  
15.   "AppSupportDatabase": {  
16.     "ConnectionString": "server=.;initial catalog=TestDB;user id=sa;password=123",  
17.     "ProviderName": "System.Data.SqlClient"  
18.   }  
19. }  

We would like to take ProviderName how to do it? First, a new ConfigManager

 

1. public class  ConfigManager   
2.   {  
3.       public string ProviderName { get; set; }  
4.   
5.       public string ConnectionString { get; set; }  
6.   }  

GetAppsettings way

 

1. public T GetAppsettings<T>(string key) where T : class, new()  
2.  {  
3.      string keyDir = System.IO.Directory.GetCurrentDirectory();  
4.   
5.      IConfiguration config = new ConfigurationBuilder()  
6.          .SetBasePath(keyDir)  
7.          .Add(new JsonConfigurationSource { Path = "appsettings.json", ReloadOnChange = true })  
8.          .Build();  
9.      var appconfig = new ServiceCollection()  
10.          .AddOptions()  
11.          .Configure<T>(config.GetSection(key))  
12.          .BuildServiceProvider()  
13.          .GetService<IOptions<T>>()  
14.          .Value;  
15.      return appconfig;  
16.  }  

Examples of call

 

1. GetAppsettings<ConfigManager>("AppSupportDatabase").ProviderName  

 

Source: https://www.studenty.cn/?p=1094

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We need to quote the official nuget package

①：Microsoft.Extensions.Configuration

②：Microsoft.Extensions.Options.ConfigurationExtensions

User-defined profiles json

Here profile name I use appsettings.json

Content profile as shown:

In the Startup method Startup class in the code editor, I put the code posted Come:

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);

In the code ConnectionStrings class is a Model, and then you create connString variable has been instantiated. You can visit

Author: Oscar skin
link: https: //www.jianshu.com/p/a13a0194ff91
Source: Jane book
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