DbChangeTrackerExtension.cs

using System.Linq;
using System.Data.Entity.Infrastructure;
using System;

namespace Reckon.Data.EF
{
    public static class DbChangeTrackerExtension
    {
        /// <summary>
        /// Get a summary of Tracked Changes on a DbContext.ChangeTracker
        /// </summary>
        /// <param name="dbChangeTracker">DbContext.ChangeTracker</param>
        /// <example>
        ///     Debug.WriteLine(myDbContext.ChangeTracker.GetTrackedChangesSummary());
        /// </example>       
        public static string GetTrackedChangesSummary(this DbChangeTracker dbChangeTracker)
        {
            var linesByEntityState = string.Join(Environment.NewLine, dbChangeTracker.Entries()
                .GroupBy(f => new { entityName = f.Entity.GetType().Name, f.State })
                .OrderBy(f => f.Key.entityName).ThenBy(f => f.Key.State)
                .Select(f => $"entity={f.Key.entityName}, state={f.Key.State}, count={f.Count()}"));

            var byState = string.Join(", ", dbChangeTracker.Entries()
                .GroupBy(f => f.State)
                .OrderBy(f => f.Key)
                .Select(f => $"{f.Key}={f.Count()}"));

            var totals = $"TOTALS total={dbChangeTracker.Entries().Count()}, {byState}";

            return string.Join(Environment.NewLine, new[] { linesByEntityState, totals });
        }
    }
}