How to Implement a Custom ConfigurationSection with a ConfigurationElementCollection in .NET?

Implementing a ConfigurationSection with a ConfigurationElementCollection

In this scenario, you're encountering exceptions while implementing a custom configuration section due to a misunderstanding about the configuration element handler. This article aims to clarify the process of implementing a ConfigurationSection with a ConfigurationElementCollection.

Understanding the Exception

The exception you're facing arises because the IConfigurationSectionHandler interface is deprecated and no longer supported.

Custom Configuration Section

Instead of using the deprecated IConfigurationSectionHandler, you should create a custom ConfigurationSection class. Define it as a derived class of ConfigurationSection and add various properties and methods to configure your custom section. For instance, in this case, ServiceConfigurationSection would hold the Services collection property.

Custom ConfigurationElementCollection

To define a collection of elements, create a custom ConfigurationElementCollection class. This class should inherit from ConfigurationElementCollection and implement methods for adding, removing, and accessing elements. In this instance, you've already defined the ServiceCollection class to manage the collection of ServiceConfig elements.

ConfigurationSectionHandler

The deprecated IConfigurationSectionHandler interface is not utilized in this approach. Instead, define a class that inherits from ConfigurationSection and implements the properties and methods required for handling the configuration section.

Sample Code

Here's an example of the necessary code:

public class ServiceConfigurationSection : ConfigurationSection
{
    [ConfigurationProperty("Services", IsDefaultCollection = false)]
    [ConfigurationCollection(typeof(ServiceCollection),
        AddItemName = "add",
        ClearItemsName = "clear",
        RemoveItemName = "remove")]
    public ServiceCollection Services { get; }
}

public class ServiceCollection : ConfigurationElementCollection
{
    // ... (your custom element collection logic)
}

Accessing the Config Data

To access the configured data, instantiate the ServiceConfigurationSection class and access its properties, for example:

ServiceConfigurationSection section = ConfigurationManager.GetSection("ServicesSection") as ServiceConfigurationSection;
ServiceConfig config = section.Services[0];

By following these steps, you can successfully implement a custom ConfigurationSection with a ConfigurationElementCollection to read and manage your application configuration.

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