. NET core configuration file loading with di injection configuration data

. NET Core Configuration files

In the past. NET is a configuration file in XML format such as App.config/web.config, and. NET core recommends using a JSON-formatted configuration file because it is more flexible to use, and you can use DI injection configuration data from. NET Core.

Use:

1             var config = new Configurationbuilder () 2                 . Addinmemorycollection ()    //load the data of the configuration file into memory 3                 . Setbasepath (Directory.GetCurrentDirectory ())   //Specify the directory where the configuration file is located 4                 . Addjsonfile ("Appsettings.json", Optional:true, Reloadonchange:true)  //Specify the configuration file to load 5                 . Build ();    Compiled into Object  6             Console.WriteLine (config["Test"]);  Gets the data in the configuration 7             config["test"] = "test test";   Modify the data of the configuration object, the data of the configuration object is 8             Console.WriteLine (config["test11") that can be modified;    9             Console.WriteLine (config["Thekey:nextkey"])    to obtain data that does not exist in the configuration file and does not error. Get: Thekey---Nextkey value

Configuration file Appsettings.json file contents:

1 {2   "test": "TestVal", 3   "Thekey": {4     "Nextkey": "Keyval" 5   }6}

Attention:

Configurationbuilder need to add Package: "Microsoft.Extensions.Configuration"

Addjsonfile need to add Package: "Microsoft.Extensions.Configuration.Json"

Use with Di

 1 var sp = new Servicecollection () 2. AddOptions ()///inject ioptions<t&gt, so you can get ioptions<t> 3 in the Di container. configure<testcls> (config. GetSection ("Testcls"))//injection configuration Data 4//can also be modified to the injected configuration data 5. Configure<testcls> (t = 6 {7 T.name = "Jame";//Modify the value of Name 8} ) 9.    Buildserviceprovider (); Compile ten var test = sp.    Getservice<ioptions<testcls>> (); Gets the injected configuration data object, Console.WriteLine (Test. Jsonconvert.serializeobject).    Value)); {"Name": "Jame", "Age": 123}13 14//The following code verifies that the configuration data object injected by configure is in Singleton mode (three lifecycles for the Di container in. NET Core: Singleton (singleton), Scope D (Scope), Transient (transient)), var test1 = sp.   Getservice<ioptions<testcls>> (); Console.WriteLine (test = = test1); TRUE17//Create a new scope gets the configuration data object at var test2 = sp. Getservice<iservicescopefactory> (). Createscope ().   Serviceprovider.getservice<ioptions<testcls>> (); Console.WriteLine (test = = test2); True

To configure the test class:

1 public         class TESTCLS2         {3 public             string Name {get; set;} 4 public             int age {get; set;} 5         }

Content in Appsettings.json:

1 {2   "Testcls": {3     "Name": "Tom", 4     "age": 1235   }6}

Attention:

Servicecollection need to add Package: "Microsoft.Extensions.DependencyInjection"

AddOptions need to add Package: "Microsoft.Extensions.Options.ConfigurationExtensions"

Use in ASP. NET Core

Initialize the configuration file in the startup construction method, Startup.cs:

1             var builder = new Configurationbuilder () 2                 . Addinmemorycollection () 3                 . Setbasepath (env. Contentrootpath) 4                 . Addjsonfile ("Appsettings.json", Optional:true, Reloadonchange:true) 5                 . Addjsonfile ($ "appsettings.{ Env. Environmentname}.json ", optional:true); 6             Configuration = Builder. Build ();

Injection configuration data in the Startup.cs-I configureservices method:

1             Services. AddOptions ()        //inject ioptions<t>2                 . Configure<testcls> (Configuration.getsection (nameof (TESTCLS)) 3                 . configure<testcls> (Test =>4                 {5                     test). Name = "Jame"; Modify the value of name 6                 });

Configuration data in the configuration file:

1 {2   "Logging": {3     "Includescopes": false, 4     "LogLevel": {5       "Default": "Debug", 6       "System": "Infor Mation ", 7       " Microsoft ":" Information "8     } 9   },10   " Testcls ": {one     " Name ":" Tom ",     " age ": 12313   }14}

Injection into the controller:

1     [Route ("Api/[controller]")] 2 public     class Valuescontroller:controller 3     {4         ioptions< Testcls> _test; 5 Public         Valuescontroller (ioptions<testcls> test) 6         {7             _test = test; 8         } 9         [httpget]10 Public         string Gets ()         One {             return Jsonconvert.serializeobject (_test). Value);         

. NET core configuration file loading with di injection configuration data