@@ -39,8 +39,8 @@ namespace OpenTelemetry.Trace
         /// <summary>
         /// Adds given activitysource names to the list of subscribed sources.
         /// </summary>
-        /// <param name="names">Activity source names.</param>
+        /// <param name="sources">Activity source names.</param>
         /// <returns>Returns <see cref="TracerProviderBuilder"/> for chaining.</returns>
-        public abstract TracerProviderBuilder AddSource(params string[] names);
+        public abstract TracerProviderBuilder AddSource(params Source[] sources);
     }
 }
// <copyright file="TracerProviderBuilder.cs" company="OpenTelemetry Authors">
// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>
using System;

namespace OpenTelemetry.Trace
{
    /// <summary>
    /// TracerProviderBuilder base class.
    /// </summary>
    public abstract class TracerProviderBuilder
    {
        internal TracerProviderBuilder()
        {
        }

        /// <summary>
        /// Adds an instrumentation to the provider.
        /// </summary>
        /// <typeparam name="TInstrumentation">Type of instrumentation class.</typeparam>
        /// <param name="instrumentationFactory">Function that builds instrumentation.</param>
        /// <returns>Returns <see cref="TracerProviderBuilder"/> for chaining.</returns>
        public abstract TracerProviderBuilder AddInstrumentation<TInstrumentation>(
            Func<TInstrumentation> instrumentationFactory)
            where TInstrumentation : class;

        /// <summary>
        /// Adds given activitysource names to the list of subscribed sources.
        /// </summary>
        /// <param name="names">Activity source names.</param>
        /// <returns>Returns <see cref="TracerProviderBuilder"/> for chaining.</returns>
        public abstract TracerProviderBuilder AddSource(params string[] names);
    }
}

We can keep the string version as well, and internally convert that to use Source. Most users don't care about Version, so they can use the easy version.