. NET core usage configuration files

. NET core usage configuration files

In. NET core, the read of the configuration file is provided through IConfiguration, and the assembly is Microsoft.Extensions.Configuration , corresponding to a series of implementations, through which the configuration files of the type Json/xml/ini can be read.

In this section of the example, we use a JSON configuration file for the demo.

Read JSON configuration file

JSON is our common configuration file format, which can be very intuitive to reflect the configuration file hierarchy.

Create a new. NET Core console application and add a file to the project with appsettings.json the following file contents:

{  "Name": "Jerry",  "option1": "value1_from_json",  "option2": 2,  "subsection": {    "suboption1": "subvalue1_from_json"  },  "wizards": [    {      "Name": "Gandalf",      "Age": "1000"    },    {      "Name": "Harry",      "Age": "17"    }  ]}

Add the Microsoft.Extensions.Configuration.Json reference, and then use the following code to create the Iconfiguartion object:

public static IConfiguration Configuration { get; set; }//构建Configurationvar builder = new ConfigurationBuilder()    .SetBasePath(AppDomain.CurrentDomain.BaseDirectory)    .AddJsonFile("appsettings.json");Configuration = builder.Build();

Use the Iconfiguartion object to obtain configuration information:

static void ReadConfiguration(){    Console.WriteLine($"Name = {Configuration["Name"]}");    Console.WriteLine($"option1 = {Configuration["Option1"]}");    Console.WriteLine($"option2 = {Configuration["option2"]}");    Console.WriteLine($"suboption1 = {Configuration["subsection:suboption1"]}");    Console.WriteLine();    Console.WriteLine("Wizards:");    Console.Write($"{Configuration["wizards:0:Name"]}, ");    Console.WriteLine($"age {Configuration["wizards:0:Age"]}");    Console.Write($"{Configuration["wizards:1:Name"]}, ");    Console.WriteLine($"age {Configuration["wizards:1:Age"]}");    Console.WriteLine();    Console.WriteLine("Press a key...");    Console.ReadKey();}

To read configuration information using strongly typed:

static void ConvertConfiguration(){    //读取整个配置文件    var appSettings = Configuration.Get<AppSettings>();    Console.WriteLine("AppSettings = ");    Console.WriteLine(JsonConvert.SerializeObject(appSettings, Formatting.Indented));    //读取某个节点    IList<Wizard> wizards = Configuration.GetSection("wizards").Get<IList<Wizard>>();    Console.WriteLine("wizards = ");    Console.WriteLine(JsonConvert.SerializeObject(wizards, Formatting.Indented));    Console.WriteLine("Press a key...");    Console.ReadKey();}

Note: Using the Bind method conversion in version 1.0, 2.0 can use the Get method to obtain strongly typed files more easily = =

Note: When multiple profiles are used and the same key is included in the configuration file, the key values in the added configuration file will overwrite the first added value = =

Other types of configuration files are used similarly, not to repeat them.

Reference Document: https://docs.microsoft.com/zh-cn/aspnet/core/fundamentals/startup?view=aspnetcore-2.1

. NET core usage configuration files