Blob .NET Manual Trace Example

using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
using Datadog.Trace; //Adding the Datadog.Trace nuget package (https://www.nuget.org/packages/Datadog.Trace)

namespace BlobServiceAPI.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class BlobServiceController : ControllerBase
    {
        // GET api/values
        [HttpGet]
        public ActionResult<IEnumerable<string>> Get()
        {
            UploadToBlob();
            return new string[] { "Upload to blob triggered" };
        }
        private async void UploadToBlob()
        {
            //Creating a new instance of Tracer object for Datadog .NET APM
            using (var scope = Tracer.Instance.StartActive("blobServiceController.uploadToBlob"))
            {
                // adding additional metadata via tags to the spans.
                var span = scope.Span;
                span.Type = SpanTypes.Http;
                span.ResourceName = "POST";
                span.ServiceName = "blobserviceapi";

                string storageConnectionString = Startup.AzureConnectionString;
                CloudStorageAccount storageAccount;
                if (CloudStorageAccount.TryParse(storageConnectionString, out storageAccount))
                {
                    // If the connection string is valid, proceed with operations against Blob
                    CloudBlobClient cloudBlobClient = storageAccount.CreateCloudBlobClient();

                    CloudBlobContainer cloudBlobContainer = cloudBlobClient.GetContainerReference("products");

                    CloudBlockBlob cloudBlockBlob = cloudBlobContainer.GetBlockBlobReference("dd_test." + Guid.NewGuid().ToString() + ".txt");
                    
                    //adding manual Datadog trace_id injection for custom log, (https://docs.datadoghq.com/tracing/connect_logs_and_traces/dotnet/?tab=serilog)
                    string msgbody = $"New blob added to {cloudBlobContainer.StorageUri.PrimaryUri} :: dd.trace_id={span.TraceId} dd.span_id={span.SpanId}";
                    await cloudBlockBlob.UploadTextAsync(msgbody);
                }
                else
                {
                    // Otherwise, let the user know that they need to define the environment variable.
                    throw new Exception(
                        "A connection string has not been defined in the system environment variables. " +
                        "Add an environment variable named 'CONNECT_STR' with your storage " +
                        "connection string as a value.");
                }
            }
        }
    }
}