richlander

const string Bar = "Bar";
const string DoubleBar = $"{Bar}_{Bar}";

WriteLine(DoubleBar);

richlander

private static string GetLoggingPath()
{
    // Verify the code is running on Windows.
    if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
    {
        using (var key = Registry.CurrentUser.OpenSubKey(@"Software\Fabrikam\AssetManagement"))
        {
            if (key?.GetValue("LoggingDirectoryPath") is string configuredPath)
                return configuredPath;
        }

richlander

Playing with .NET 8 Containers

We just shipped a cool new scenario for .NET, which is making it really easy to run .NET 8 container images as a non-root user.

Friends don't let friends run as root

We should all get T-Shirts that say that.

Let's take a quick look using our favourite aspnetapp sample. I'm going to use WSL. I'll show you everthing I do. I use the patterns that are easiest for me, which might not be the same for you.

richlander

.NET Core 3.0 SDK Size Improvements

The .NET Core SDK is significantly smaller with .NET Core 3.0. The primary reason is that we changed the way we construct the SDK, by moving to purpose-built “packs” of various kinds (reference assemblies, frameworks, templates). In previous versions (including .NET Core 2.2), we constructed the SDK from NuGet packages, which included many artifacts that were not required and wasted a lot of space.

The following sections demonstrate the size improvements for Windows, Linux and macOS, including container delivery. They detail the process and commands that were used to determine the product sizes, enabling you to reproduce the same results in your own environment. To keep thing simple, zips and tar balls were downloaded from dotnet/core-sdk as opposed to the official installers.

Some readers will be shocked on how large the .NET Core 2.2 installer directory grows when the NuGetFallback archive is expanded to the NuGetFallBackFolder. W

richlander

// Example 1: Signing a byte[] using PKCS#1 v1.5 padding and a SHA-256 hash
 
// 4.5:
public static byte[] SignDataPkcs1Sha256(X509Certificate2 cert, byte[] data)
{
    // X509Certificate2.PrivateKey returns the same object across multiple calls,
    // so it shouldn't be Disposed independent of the X509Certificate2 object.
    //
    // The RSA base class doesn't expose any signature-based methods.
    // The PrivateKey property returns AsymmetricAlgorithm, so really this call should be

richlander

static double ParseJson()
{
    const string json = " [ { \"name\": \"John\" }, [ \"425-000-1212\", 15 ], { \"grades\": [ 90, 80, 100, 75 ] } ]";

    double average = -1;

    using (JsonDocument doc = JsonDocument.Parse(json))
    {
        JsonElement root = doc.RootElement;
        JsonElement info = root[1];

richlander

.NET 6 Examples

• Record structs
• Readonly record structs
• Extended property patterns
• const interpolated string

Note: See .NET 5 examples

richlander

Battery battery = new("CR2032", 0.235, 100);

WriteLine(battery);

while (battery.RemainingCapacityPercentage > 0)
{
    battery.RemainingCapacityPercentage--;
}

WriteLine(battery);

richlander

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

</Project>

richlander

Battery battery = new("CR2032", 0.235, 100);

WriteLine(battery);

while (battery.RemainingCapacityPercentage > 0)
{
    Battery updatedBattery = battery with {RemainingCapacityPercentage = battery.RemainingCapacityPercentage - 1};
    battery = updatedBattery;
}