Whats New in ASP.NET Core
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The document discusses Span<T> and Memory<T> in .NET Core, which provide new ways to access arrays and memory without boxing or copying. It demonstrates slicing a Span to access a subset of an array, and shows that changes to the sliced Span are reflected in the original array. It also summarizes performance improvements in .NET Core 2.1 for StringBuilder and string operations.
![var arr = new byte[10];
Span<byte> bytes = arr; // Implicit cast from T[] to Span<T>
Span<byte> slicedBytes = bytes.Slice(start: 5, length: 2);
slicedBytes[0] = 42;
slicedBytes[1] = 43;
Assert.Equal(42, slicedBytes[0]);
Assert.Equal(43, slicedBytes[1]);
Assert.Equal(arr[5], slicedBytes[0]);
Assert.Equal(arr[6], slicedBytes[1]);
slicedBytes[2] = 44; // Throws IndexOutOfRangeException
bytes[2] = 45; // OK
Assert.Equal(arr[2], bytes[2]);
Assert.Equal(45, arr[2]);](https://image.slidesharecdn.com/whatsnewinasp-180920202000/85/Whats-New-in-ASP-NET-Core-6-320.jpg)
![SignalR
Razor class
libraries
Identity UI library
& scaffolding
HTTPS
GDPR
MVC functional
testing
[ApiController],
ActionResult<T>
IHttpClientFactory
Kestrel on Sockets
Generic host
builder
Performance
Updated SPA
templates](https://image.slidesharecdn.com/whatsnewinasp-180920202000/85/Whats-New-in-ASP-NET-Core-13-320.jpg)
Whats New in ASP.NET Core
- 6. var arr = new byte[10]; Span<byte> bytes = arr; // Implicit cast from T[] to Span<T> Span<byte> slicedBytes = bytes.Slice(start: 5, length: 2); slicedBytes[0] = 42; slicedBytes[1] = 43; Assert.Equal(42, slicedBytes[0]); Assert.Equal(43, slicedBytes[1]); Assert.Equal(arr[5], slicedBytes[0]); Assert.Equal(arr[6], slicedBytes[1]); slicedBytes[2] = 44; // Throws IndexOutOfRangeException bytes[2] = 45; // OK Assert.Equal(arr[2], bytes[2]); Assert.Equal(45, arr[2]);
- 9. private static readonly StringBuilder s_builder = new StringBuilder(); public void StringBuilderAppend() { StringBuilder sb = s_builder; sb.Length = 0; for (int i = 0; i < 100_000; i++) sb.Append(i); } Toolchain Mean Allocated .NET Core 2.0 6.523 ms 3992000 B .NET Core 2.1 3.268 ms 0 B
- 10. public string StringToLowerChangesNeeded() => "This is a test to see what happens when we call ToLower.".ToLower(); public string StringToLowerAlreadyCased() => "this is a test to see what happens when we call tolower.".ToLower(); Method Toolchain Mean Allocated StringToLowerChangesNeeded .NET Core 2.0 187.00 ns 144 B StringToLowerChangesNeeded .NET Core 2.1 96.29 ns 144 B StringToLowerAlreadyCased .NET Core 2.0 197.21 ns 144 B StringToLowerAlreadyCased .NET Core 2.1 68.81 ns 0 B
- 11. “Using the same-size server, we were able to go from 1,000 requests per second per node with Node.js to 20,000 requests per second with .NET Core.“ — Raygun https://www.microsoft.com/net/customers Data sourced from official tests available at TechEmpower Round 16. Java Servlet .NET Core Node.js 6.97M requests / sec2.55M requests / sec 0.82M requests / sec
- 12. 2.6MM 599K 97K 2.9MM 662K 216K - 500,000 1,000,000 1,500,000 2,000,000 2,500,000 3,000,000 1 2 3 RUNTIME PERFORMANCE Series1 Series2 Data sourced from tests in our labs on same hardware as TechEmpower
- 13. SignalR Razor class libraries Identity UI library & scaffolding HTTPS GDPR MVC functional testing [ApiController], ActionResult<T> IHttpClientFactory Kestrel on Sockets Generic host builder Performance Updated SPA templates
- 15. • Add real-time web functionalities easily with Azure and .NET Core 2.1 • Enable via “services.AddSignalR().AddAzureSignalR()” Fully managed service No more worries about capacity provisioning, scaling, or persistent connections Use ASP.NET Core SignalR to build real-time experiences such as chat, stock tickers, live dashboards, and instant broadcasting </> Native SignalR development
- 29. .NET
- 30. ASP.NET Core 2.2 Preview 2
- 54. Install the .NET Core 2.2 Preview 2 SDK https://www.microsoft.com/net/download/dotnet-core/2.2
- 55. .NET
- 61. What's New in ASP.NET Core? - .NET Conf 2018 All presentation links (Scan QR Code