.NET Core development actual combat (Lesson 11: Configuration File Provider) - Study Notes

11 | Configuration File Provider: the freedom to choose the format configuration

Configuration File Provider

• Microsoft.Extensions.Configuration.Ini
• Microsoft.Extensions.Configuration.Json
• Microsoft.Extensions.Configuration.NewtonsoftJson
• Microsoft.Extensions.Configuration.Xml
• Microsoft.Extensions.Configuration.UserSecrets

These are needed to read a different file formats, or to read the file from different locations

File provider supports

• If the file Optional
• Monitoring file changes

By following the code to understand these properties

Source link:
https://github.com/witskeeper/geektime/tree/master/samples/ConfigurationFileDemo

References the following four packages:

• Microsoft.Extensions.Configuration
• Microsoft.Extensions.Configuration.Abstractions
• Microsoft.Extensions.Configuration.Ini
• Microsoft.Extensions.Configuration.Json

Read appsettings.json

{
  "Key1": "Value1",
  "Key2": "Value2"
}

The main program

var builder = new ConfigurationBuilder();
builder.AddJsonFile("appsettings.json");
var configurationRoot = builder.Build();

Console.WriteLine($"Key1:{configurationRoot["Key1"]}");
Console.WriteLine($"Key2:{configurationRoot["Key2"]}");
Console.WriteLine($"Key3:{configurationRoot["Key3"]}");
Console.ReadKey();

Start the program, the output is as follows:

Key1:Value1
Key2:Value2
Key3:

Key3 does not exist, so his value is empty

If the file is its optional second parameter optional, default is false

builder.AddJsonFile("appsettings.json", optional:false);

This means that when the file does not exist it will complain

It's another argument is reloadOnChange, default is true

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

This means that every time a file is changed, it will go to read the new file

Then look at the appsettings.ini

Key3=Value3 in ini

The main program

var builder = new ConfigurationBuilder();
builder.AddJsonFile("appsettings.json", optional:false, reloadOnChange:true);
builder.AddIniFile("appsettings.ini");
var configurationRoot = builder.Build();

Console.WriteLine($"Key1:{configurationRoot["Key1"]}");
Console.WriteLine($"Key2:{configurationRoot["Key2"]}");
Console.WriteLine($"Key3:{configurationRoot["Key3"]}");
Console.ReadKey();

Start the program, the output is as follows:

Key1:Value1
Key2:Value2
Key3:Value3 in ini

Here you can see the new configuration has been added to take effect

source is arranged to add builder sequential relationship, the configuration will be added to cover the first add arrangement

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