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Showing content from https://github.com/autofac/Autofac.Configuration below:

autofac/Autofac.Configuration: Configuration support for Autofac IoC

Configuration support for Autofac.

Please file issues and pull requests for this package in this repository rather than in the Autofac core repo.

• Documentation
• NuGet
• Contributing
• Open in Visual Studio Code

The basic steps to getting configuration set up with your application are:

1. Set up your configuration in JSON or XML files that can be read by Microsoft.Extensions.Configuration.
   • JSON configuration uses Microsoft.Extensions.Configuration.Json
   • XML configuration uses Microsoft.Extensions.Configuration.Xml
2. Build the configuration using the Microsoft.Extensions.Configuration.ConfigurationBuilder.
3. Create a new Autofac.Configuration.ConfigurationModule and pass the built Microsoft.Extensions.Configuration.IConfiguration into it.
4. Register the Autofac.Configuration.ConfigurationModule with your container.

A configuration file with some simple registrations looks like this:

{
  "defaultAssembly": "Autofac.Example.Calculator",
  "components": [{
    "type": "Autofac.Example.Calculator.Addition.Add, Autofac.Example.Calculator.Addition",
    "services": [{
      "type": "Autofac.Example.Calculator.Api.IOperation"
    }],
    "injectProperties": true
  }, {
    "type": "Autofac.Example.Calculator.Division.Divide, Autofac.Example.Calculator.Division",
    "services": [{
      "type": "Autofac.Example.Calculator.Api.IOperation"
    }],
    "parameters": {
      "places": 4
    }
  }]
}

JSON is cleaner and easier to read, but if you prefer XML, the same configuration looks like this:

<?xml version="1.0" encoding="utf-8" ?>
<autofac defaultAssembly="Autofac.Example.Calculator">
    <components name="0">
        <type>Autofac.Example.Calculator.Addition.Add, Autofac.Example.Calculator.Addition</type>
        <services name="0" type="Autofac.Example.Calculator.Api.IOperation" />
        <injectProperties>true</injectProperties>
    </components>
    <components name="1">
        <type>Autofac.Example.Calculator.Division.Divide, Autofac.Example.Calculator.Division</type>
        <services name="0" type="Autofac.Example.Calculator.Api.IOperation" />
        <injectProperties>true</injectProperties>
        <parameters>
            <places>4</places>
        </parameters>
    </components>
</autofac>

Note the ordinal "naming" of components and services in XML - this is due to the way Microsoft.Extensions.Configuration handles ordinal collections (arrays).

Build up your configuration and register it with the Autofac ContainerBuilder like this:

// Add the configuration to the ConfigurationBuilder.
var config = new ConfigurationBuilder();
// config.AddJsonFile comes from Microsoft.Extensions.Configuration.Json
// config.AddXmlFile comes from Microsoft.Extensions.Configuration.Xml
config.AddJsonFile("autofac.json");

// Register the ConfigurationModule with Autofac.
var module = new ConfigurationModule(config.Build());
var builder = new ContainerBuilder();
builder.RegisterModule(module);

Check out the Autofac configuration documentation for more information.

Need help with Autofac? We have a documentation site as well as API documentation. We're ready to answer your questions on Stack Overflow or check out the discussion forum.

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