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Home Forums How to use appsettings.json in Asp.net core? – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 07 Jul 2023
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The appsettings.json file is used to store configuration settings for an ASP.NET Core application. These settings can be used to configure anything from database connection strings to application secrets.

To use the appsettings.json file, you first need to add it to your project. You can do this by right-clicking on your project in Solution Explorer and selecting Add > New Item. From the list of templates, select App Settings File and click Add.

Once the appsettings.json file has been added, you can start adding configuration settings to it. Each setting is defined as a key-value pair. The key is the name of the setting and the value is the value of the setting.

For example, to define a database connection string, you would add the following setting to the appsettings.json file:

Code snippet

"ConnectionStrings": {
    "DefaultConnection": "Data Source=localhost;Initial Catalog=MyDatabase;Integrated Security=True"
}

Once you have added your configuration settings to the appsettings.json file, you can access them in your code using the IConfiguration service. The IConfiguration service is provided by the ASP.NET Core framework and it can be injected into your classes using dependency injection.

To access a configuration setting, you can use the GetSection() method. The GetSection() method takes the name of the section as its parameter and returns an IConfigurationSection object. The IConfigurationSection object contains all of the settings in the specified section.

For example, to get the database connection string, you would use the following code:

Code snippet

var configuration = DependencyResolver.Current.GetService<IConfiguration>();
var section = configuration.GetSection("ConnectionStrings");
var connectionString = section["DefaultConnection"];

The connectionString variable will now contain the value of the DefaultConnection setting in the ConnectionStrings section of the appsettings.json file.

You can also use the IConfiguration service to get individual configuration settings by using the GetValue() method. The GetValue() method takes the name of the setting and the default value as its parameters. If the setting is not found in the configuration file, the default value will be returned.

For example, to get the value of the MySetting setting, you would use the following code:

Code snippet

var configuration = DependencyResolver.Current.GetService<IConfiguration>();
var value = configuration.GetValue("MySetting", "Default Value");

The value variable will now contain the value of the MySetting setting, or the default value if the setting is not found in the configuration file.

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