SwaggerDefaultValues.cs

namespace Microsoft.Examples
{
    using Swashbuckle.Swagger;
    using System.Linq;
    using System.Web.Http.Description;

    /// <summary>
    /// Represents the Swagger/Swashbuckle operation filter used to document the implicit API version parameter.
    /// </summary>
    /// <remarks>This <see cref="IOperationFilter"/> is only required due to bugs in the <see cref="SwaggerGenerator"/>.
    /// Once they are fixed and published, this class can be removed.</remarks>
    public class SwaggerDefaultValues : IOperationFilter
    {
        /// <summary>
        /// Applies the filter to the specified operation using the given context.
        /// </summary>
        /// <param name="operation">The operation to apply the filter to.</param>
        /// <param name="schemaRegistry">The API schema registry.</param>
        /// <param name="apiDescription">The API description being filtered.</param>
        public void Apply( Operation operation, SchemaRegistry schemaRegistry, ApiDescription apiDescription )
        {
            if ( operation.parameters == null )
            {
                return;
            }

            foreach ( var parameter in operation.parameters )
            {
                var description = apiDescription.ParameterDescriptions.First( p => p.Name == parameter.name );

                // REF: https://github.com/domaindrivendev/Swashbuckle/issues/1101
                if ( parameter.description == null )
                {
                    parameter.description = description.Documentation;
                }

                // REF: https://github.com/domaindrivendev/Swashbuckle/issues/1089
                // REF: https://github.com/domaindrivendev/Swashbuckle/pull/1090
                if ( parameter.@default == null )
                {
                    parameter.@default = description.ParameterDescriptor.DefaultValue;
                }
            }
        }
    }
}