<PackageReference Include="System.Configuration.ConfigurationManager" Version="4.6.0-preview6.19264.9" />

ConfigurationCollectionAttribute

public sealed class ConfigurationCollectionAttribute : Attribute
Declaratively instructs the .NET Framework to create an instance of a configuration element collection. This class cannot be inherited.
public string AddItemName { get; set; }

Gets or sets the name of the &lt;add&gt; configuration element.

public string ClearItemsName { get; set; }

Gets or sets the name for the &lt;clear&gt; configuration element.

public ConfigurationElementCollectionType CollectionType { get; set; }

Gets or sets the type of the ConfigurationCollectionAttribute attribute.

public Type ItemType { get; }

Gets the type of the collection element.

public string RemoveItemName { get; set; }

Gets or sets the name for the &lt;remove&gt; configuration element.

public ConfigurationCollectionAttribute(Type itemType)

Initializes a new instance of the ConfigurationCollectionAttribute class.