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IMetadataProvider Interface

Defines an attribute that provides custom metadata generation.

Namespace:  Autofac.Extras.AttributeMetadata
Assembly:  Autofac.Extras.AttributeMetadata (in Autofac.Extras.AttributeMetadata.dll) Version: 4.0.1-CI-226
Syntax
public interface IMetadataProvider

The IMetadataProvider type exposes the following members.

Methods
  NameDescription
Public methodGetMetadata
Gets metadata pairs for the passed target type.
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Remarks

The standard attribute metadata mechanism takes the names of public properties from an attribute and creates a dictionary of name/value pairs based on those properties, using that as the metadata for a service.

When you need to provide a more robust attribute-based definition of metadata, you can instead have your metadata attribute implement this interface. Rather than using name/value pairs generated by the properties on your attribute, you can directly provide the metadata key/value pairs to associate with a service.

Examples

This example shows what a metadata attribute might look like when providing custom metadata:

C#
[MetadataAttribute]
[AttributeUsage(AttributeTargets.Class)]
public class ProvidedMetadataAttribute : Attribute, IMetadataProvider
{
  public IDictionary<string, object> GetMetadata(Type targetType)
  {
    return new Dictionary<string, object>()
    {
      { "Key1", "Value1" },
      { "Key2", "Value2" }
    };
  }
}
See Also