Azure – How to register Custom Events in Application Insights by using OpenTelemetry .NET

How to register Custom Events in Application Insights by using OpenTelemetry .NET

Using below code I am able to register the custom events by using Open telemetry in C#.

Code:

using System;
using Microsoft.Extensions.Logging;
using OpenTelemetry;
using OpenTelemetry.Trace;
using Microsoft.ApplicationInsights;
using Microsoft.ApplicationInsights.DataContracts;
using OpenTelemetry.Resources;
using Azure.Monitor.OpenTelemetry.Exporter;

class Program
{
    [Obsolete]
    static void Main(string[] args)
    {
        // Initialize OpenTelemetry with Azure Monitor exporter
        using var tracerProvider = Sdk.CreateTracerProviderBuilder()
            .AddSource("YourApplication")
            .SetResourceBuilder(ResourceBuilder.CreateDefault().AddService("sample"))
            .AddAzureMonitorTraceExporter(options =>
            {
                options.ConnectionString = "your-azure-monitor conn-string";
            })
            .Build();

        // Create a custom event
        var customEvent = new MyCustomEvent
        {
            Name = "CustomEvent",
            Property1 = "Value1",
            Property2 = "Value2"
        };

        // Send the custom event to Application Insights
        SendCustomEventToApplicationInsights(customEvent);
    }

    [Obsolete]
    static void SendCustomEventToApplicationInsights(MyCustomEvent customEvent)
    {
        // Initialize Application Insights TelemetryClient
        var telemetryClient = new TelemetryClient
        {
            InstrumentationKey = "your-application insights instrumentation-key"
        };

        // Track the custom event using TelemetryClient
        var properties = new Dictionary<string, string>
        {
            { "Property1", customEvent.Property1 },
            { "Property2", customEvent.Property2 }
        };

        telemetryClient.TrackEvent(customEvent.Name, properties);
        telemetryClient.Flush(); // Flush the telemetry to ensure it is sent immediately
    }
}

class MyCustomEvent
{
    public string? Name { get; set; }
    public string? Property1 { get; set; }
    public string? Property2 { get; set; }
}

I am able to see custom events in application insights. check below:

Output: