C# Configuration Extensions example

TracerProvicerExtensions.cs

namespace OpenTelemetry.Trace
{
    /// <summary>
    /// Extension methods to simplify registering of dependency instrumentation.
    /// </summary>
    public static class TracerProviderBuilderExtensions
    {
        /// <summary>
        /// Enables Microsoft.EntityFrameworkCore instrumentation.
        /// </summary>
        /// <param name="builder"><see cref="TracerProviderBuilder"/> being configured.</param>
        /// <param name="configureOptions">EntityFrameworkCore configuration options.</param>
        /// <returns>The instance of <see cref="TracerProviderBuilder"/> to chain the calls.</returns>
        public static TracerProviderBuilder AddEntityFrameworkCoreInstrumentation(
            this TracerProviderBuilder builder,
            Action<EntityFrameworkInstrumentationOptions> configureOptions = null)
        {
            if (builder == null)
            {
                throw new ArgumentNullException(nameof(builder));
            }

            var options = new EntityFrameworkInstrumentationOptions();
            configureOptions?.Invoke(options);

            builder.AddInstrumentation(() => new EntityFrameworkInstrumentation(options));

            builder.AddSource(EntityFrameworkDiagnosticListener.ActivitySourceName);

            return builder;
        }
    }
}