Unlocking Performance, Productivity, and Modern Features

When a Long-Term Support (LTS) release of .NET drops, the entire ecosystem pays attention. Enterprises want stability. Developers want productivity and performance. With .NET 10, we get both.

Compared to short-term releases like .NET 9, .NET 10 cements improvements into a version that teams will use for years. It enhances runtime performance, streamlines everyday tooling, modernizes the language with C# 14, and provides significant feature upgrades to frameworks like ASP.NET Core and EF Core.

This is not just “one more yearly update.” It’s a release that makes .NET feel more powerful — and more enjoyable — for building modern apps.

Runtime + Native AOT: Speed You Can Feel

Performance is always a highlight, and .NET 10 delivers under the hood.

Smarter JIT Optimizations

  • Inlining improvements reduce call overhead.
  • Loop inversion optimizes performance in tight loops.
  • Array de-virtualization removes extra lookups when iterating over arrays.

These changes add up — making hot paths faster with no code changes.

Native AOT Improvements

Native AOT compiles apps ahead of time, reducing startup time and memory.

When to use it?

  • Microservices → faster cold starts in Kubernetes.
  • Serverless → lower latency on the first request.
  • CLI tools → snappy execution and smaller size.

Example Benchmark (Hello World)

  • JIT: ~120ms startup, ~15MB memory.
  • Native AOT: ~40ms startup, ~8MB memory.

This isn’t theoretical — we can feel the speed.

SDK Tooling: One-Shot Tools & Smarter CLI

Developers spend a lot of time in the CLI. .NET 10 makes that time productive.

One-Shot Tool Execution

Before .NET 10, running a tool required:

dotnet tool install -g dotnet-format
dotnet format

Now, with dnx, we can:

dnx dotnet-format -- --check

No install. No cleanup. Perfect for CI/CD pipelines.

CLI Introspection

We can now ask the CLI about itself:

dotnet build --cli-schema json

This returns structured JSON of available options, enabling IDEs and shells to provide richer autocompletion and automation.

File-Based Apps

We can run a single file:

dotnet run hello.cs

Or publish it with NativeAOT for distribution. This is “npx for .NET.”

C# 14: Tiny Features, Big Joy

C# continues to evolve with small features that remove friction.

Extension Members

Instead of cluttering with static helper classes, we extend types directly:

extension OrderExtensions
{
    public decimal TaxedTotal(Order o) => o.Total * 1.1m;
}

Cleaner, more discoverable APIs.

Field-Backed Properties

We no longer need verbose code to customize auto-properties:

public string Name
{
    get => field;
    set => field = value?.Trim() ?? "";
}

The field keyword references the backing field automatically.

Null-Conditional Assignment

Updating safely used to be noisy:

if (person?.Scores != null)
    person.Scores += 10;

Now:

person?.Scores += 10;

Simple. Readable.

Span Conversions

Working with slices of memory is now even smoother with implicit conversions to/from Span<T>. Great for performance-sensitive code.

ASP.NET Core: Modern Defaults

Web apps get a serious boost.

OpenAPI 3.1 Support

Minimal APIs can now generate OpenAPI 3.1 docs, including YAML.

builder.Services.AddOpenApi();
app.MapOpenApi();

API-first teams can integrate instantly with tooling like Stoplight or Postman.

Server-Sent Events (SSE)

Real-time updates without WebSockets are now built-in:

app.MapGet("/events", () => 
    Results.ServerSentEvents(async channel =>
    {
        await channel.SendEventAsync("ready");
        await channel.SendEventAsync("update", "Order processed");
    }));

Streaming updates become a one-liner.

Identity with Passkeys

Out of the box, ASP.NET Identity now supports passkeys (WebAuthn). Passwordless apps are easier than ever.

Blazor Improvements

  • <LinkPreload /> for faster page loads.
  • Bundler-friendly builds for Webpack/Rollup.
  • Better validation and reconnection UX.

All of this makes ASP.NET Core more modern by default.

EF Core 10: Real Features for Real Apps

Entity Framework Core continues to close the gap between LINQ and SQL.

Named Query Filters

We can toggle filters by name — useful for soft deletes or multitenancy.

builder.Entity<Order>()
    .HasQueryFilter("IsActive", o => !o.IsDeleted);

Later, we can disable it:

context.IgnoreQueryFilters("IsActive");

LINQ LeftJoin / RightJoin

Before EF Core 10, writing a left join meant juggling join ... into plus DefaultIfEmpty(). It worked, but it wasn’t obvious to new readers what was going on.

Now, EF Core 10 gives us first-class operators:

Left Join Example:

var query = context.Customers
    .LeftJoin(
        context.Orders,
        c => c.Id,
        o => o.CustomerId,
        (c, o) => new { c.Name, OrderId = o != null ? o.Id : (int?)null }
    )
    .ToList();

Right Join Example:

var query = context.Orders
    .RightJoin(
        context.Customers,
        o => o.CustomerId,
        c => c.Id,
        (o, c) => new { CustomerName = c?.Name, OrderId = o.Id }
    )
    .ToList();

These new operators are:

  • Clearer → The join type is explicit.
  • Less boilerplate → No into or DefaultIfEmpty().
  • Safer → Easier to maintain and less error-prone.

Cosmos DB Hybrid Search

EF Core 10 also adds vector search combined with full-text search in Cosmos DB. This means we can run semantic + keyword search together, enabling AI-style queries inside our data layer.

var results = await context.Products
    .Where(p => p.Description.Contains("camera"))
    .OrderByVector(p => p.Embedding, queryVector)
    .ToListAsync();

What to Upgrade First

.NET 10 is big, but we don’t need to adopt everything at once.

  • SDK + Tools → Zero-risk productivity boost.
  • ASP.NET Core → Gain OpenAPI 3.1 and SSE immediately.
  • EF Core 10 → Use named filters for cleaner queries.
  • AOT → Start with utilities or microservices.
  • C# 14 → Introduce gradually into new modules.

Step by step, we modernize safely.

Final Thoughts

.NET 10 isn’t just another yearly release. It’s a platform upgrade that makes apps faster, tooling smoother, APIs cleaner, and databases smarter.

We get immediate benefits — shorter startup, simpler CLI, expressive C# code, and modern web standards. We also gain long-term stability as an LTS release.

This is the version to adopt. Not because Microsoft says so, but because we feel it in every project we touch.

BÀI VIẾT LIÊN QUANXEM THÊM