Program.cs

// <copyright file="Program.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 Microsoft.Extensions.Logging;
using OpenTelemetry.Logs;

namespace GettingStarted;

public class Program
{
    public static void Main()
    {
        using var loggerFactory = LoggerFactory.Create(builder =>
        {
            builder.AddOpenTelemetry(options =>
            {
                options.AddConsoleExporter();
            });
        });

        var logger = loggerFactory.CreateLogger<Program>();

        logger.LogInformation(eventId: 123, "Hello from {name} {price}.", "tomato", 2.99);

        if (logger.IsEnabled(LogLevel.Debug))
        {
            // If logger.IsEnabled returned false, the code doesn't have to spend time evaluating the arguments.
            // This can be especially helpful if the arguments are expensive to calculate.
            logger.LogDebug(eventId: 501, "System.Environment.Version: {version}.", System.Environment.Version);
        }
    }
}