Application Insight logging in Minimal API .netcore

Question

Hi,

I am working on minimal APIs and not quite sure how to add App Insights logging.

Could someone please point me to any documentation?

Thanks in advance.

Answer 1

It should be the same as in ASP.NET Core.

using Microsoft.Extensions.Logging;

WebApplicationBuilder builder = WebApplication.CreateBuilder(args);

// ConfigureServices
builder.Services.AddDbContext<EmployeeContext>(options =>
    options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection")));

// Add Application Insights
builder.Services.AddApplicationInsightsTelemetry();

await using WebApplication app = builder.Build();

// Configure
if (app.Environment.IsDevelopment())
{
    app.UseDeveloperExceptionPage();
}

app.MapGet("/employees", async (EmployeeContext dbContext) =>
{
    app.Logger.LogInformation("Getting employees");

    return await dbContext.Employees.ToListAsync();
});

await app.RunAsync();

You need to add AppInsights Key to appsettings.json

Answer 2

Hi @Newbie Dev ，

To add Application Insights telemetry to ASP.NET Core applications,

First, you need to ensure the Microsoft.ApplicationInsights.AspNetCore NuGet package is installed. If not, you can install it via Nuget.

Second, register and configure the Application Insights service in the Program.cs file:

using Microsoft.Extensions.Logging.ApplicationInsights;  
  
var builder = WebApplication.CreateBuilder(args);  
  
// Add services to the container.  
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle  
builder.Services.AddEndpointsApiExplorer();  
builder.Services.AddSwaggerGen();  
builder.Services.AddApplicationInsightsTelemetry();  
builder.Host.ConfigureLogging((context, builder) =>  
{  
    // Providing an instrumentation key is required if you're using the  
    // standalone Microsoft.Extensions.Logging.ApplicationInsights package,  
    // or when you need to capture logs during application startup, such as  
    // in Program.cs or Startup.cs itself.  
    builder.AddApplicationInsights(  
        context.Configuration["APPLICATIONINSIGHTS_CONNECTION_STRING"]);  
  
    // Capture all log-level entries from Program  
    builder.AddFilter<ApplicationInsightsLoggerProvider>(  
        typeof(Program).FullName, LogLevel.Trace);  
  
});  
...  

Finally, in the API controller, you can use the logger as below:

public class ValuesController : ControllerBase  
{  
    private readonly ILogger _logger;  
  
    public ValuesController(ILogger<ValuesController> logger)  
    {  
        _logger = logger;  
    }  
  
    [HttpGet]  
    public ActionResult<IEnumerable<string>> Get()  
    {  
        _logger.LogWarning("An example of a Warning trace..");  
        _logger.LogError("An example of an Error level message");  
  
        return new string[] { "value1", "value2" };  
    }  
}  

More detailed information, see Application Insights logging with .NET.

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Best regards,
Dillion