Entity Framework exception telemetry for Application Insights

EntityFrameworkExceptionTelemetryInitializer.cs

using System.Data.Entity.Validation;
using System.Linq;

using Microsoft.ApplicationInsights.Channel;
using Microsoft.ApplicationInsights.DataContracts;
using Microsoft.ApplicationInsights.Extensibility;

public class EntityFrameworkExceptionTelemetryInitializer : ITelemetryInitializer
{
    public void Initialize(ITelemetry telemetry)
    {
        if (!(telemetry is ExceptionTelemetry exceptionTelemetry))
        {
            return;
        }

        if (exceptionTelemetry.Exception is DbEntityValidationException dbException)
        {
            var validationErrors = dbException.EntityValidationErrors.ToArray();
            for (var i = 0; i < validationErrors.Length; i++)
            {
                var error = validationErrors[i];

                // keys need to be unique
                var key = $"{error.Entry.Entity}[{i}]";
                var value = string.Join("; ", error.ValidationErrors.Select(e => $"{e.PropertyName}: {e.ErrorMessage}"));

                telemetry.Context.Properties.Add(key, value);
            }
        }
    }
}

telemetry.Context.Properties is deprecated in latest AI and should be replaced with GlobalProperties.

using System.ComponentModel;
using System.Data.Entity.Validation;
using System.Linq;
using Microsoft.ApplicationInsights.Channel;
using Microsoft.ApplicationInsights.DataContracts;
using Microsoft.ApplicationInsights.Extensibility;
using MoreLinq;

public class EntityFrameworkExceptionTelemetryInitializer : ITelemetryInitializer
{
    [Localizable(false)]
    public void Initialize(ITelemetry telemetry)
    {
        if (!(telemetry is ExceptionTelemetry exceptionTelemetry) || 
            !(exceptionTelemetry.Exception is DbEntityValidationException dbException))
        {
            return;
        }

        dbException.EntityValidationErrors.ForEach((error, index) =>
        {
            var key = $"{error.Entry.Entity}[{index}]";
            var value = string.Join("; ", error.ValidationErrors.Select(e => $"{e.PropertyName}: {e.ErrorMessage}"));
            telemetry.Context.GlobalProperties.Add(key, value);
        });
    }
}