DEV Community: wk

Create small ASP.NET Core Docker

wk — Sat, 20 Jun 2020 23:10:11 +0000

Create project

$ dotnet new webapi --language F# --output src/MyWeb

Create Dockerfile

FROM mcr.microsoft.com/dotnet/core/sdk:5.0-alpine AS base

WORKDIR /app
COPY src/MyWeb/MyWeb.fsproj src/MyWeb/
RUN dotnet restore src/MyWeb

COPY src/MyWeb src/MyWeb
RUN dotnet publish src/MyWeb \
    -r linux-musl-x64 \
    -c Release \
    -o /out \
    -p:PublishTrimmed=true

FROM mcr.microsoft.com/dotnet/core/runtime-deps:5.0-alpine
WORKDIR /app
COPY --from=base /out ./
CMD ./MyWeb
EXPOSE 80

Build image

$ docker build -f Dockerfile  -t wk/my-web .

Check image size

$ docker images | grep wk/my-web
wk/my-web    latest     e03dd2b6b198    4 hours ago    72.4MB

Create .NET Core 3 local tools without touching .csproj

wk — Fri, 18 Oct 2019 05:41:05 +0000

What is local tools

.NET Core 3.0 introduces local tools. Local tools are similar to global tools but are associated with a particular location on disk. Local tools aren't available globally and are distributed as NuGet packages.

Create project

dotnet new console --language C# --output sr/MyApp

Pack as tool

dotnet pack src/MyApp \
    /p:PackAsTool=true \
    /p:ToolCommandName=wk-my-app \
    /p:PackageId=wk.MyApp \
    /p:Version=0.0.1 \
    --output __publish__

Install as local tool

dotnet new tool-manifest
dotnet tool install wk.MyApp \
    --add-source __publish__

Execute

dotnet wk-my-ap

Uninstall

dotnet tool uninstall wk.MyApp

Pattern matching F# vs C#

wk — Tue, 15 Oct 2019 16:06:22 +0000

F#

type Address =
    { State: String }

let computeSalesTax address salePrice =
    match address with
    | { State = "WA" } -> salePrice * 0.06m
    | { State = "MN" } -> salePrice * 0.75m
    | { State = "MI" } -> salePrice * 0.05m
    | _ -> 0m

C#

class Address {
    public string State { set; get; }
}


static decimal ComputeSalesTax(Address address, decimal salePrice) =>
    address switch
    {
        { State: "WA" } => salePrice * 0.06M,
        { State: "MN" } => salePrice * 0.75M,
        { State: "MI" } => salePrice * 0.05M,
        _ => 0M
    }

Ternary operator in C# 8

wk — Tue, 15 Oct 2019 10:11:33 +0000

class Point {
  public int X { set; get; }
  public int Y { set; get; }
}


string IsOrigin(Point point) =>
  point is { X: 0, Y: 0 } ? "T" : "F";


var point = new Point { X = 0, Y = 0 };
var result = IsOrigin(point);