# Code Snippets # Async Parallel ```c# static Task ParallelForEachAsync (IEnumerable source, int degreeofParallelization, Func body) { async Task AwaitPartition(IEnumerator partition) { using (partition) { while (partition.MoveNext()) { await body(partition.Current); } } } return Task.WhenAll(Partitioner .Create(source) .GetPartitions(degreeofParallelization) .AsParallel() .Select(AwaitPartition)); } ``` #### Usage: ```c# var tasks = Enumerable.Range(0, 10000).Select(_ => new Func(() => Worker(results))).ToList(); await ParallelForEachAsync(tasks, 1000, async func => { await func(); }); ``` # AsyncHelper ```c# public static class AsyncHelper { private static readonly TaskFactory _myTaskFactory = new TaskFactory(CancellationToken.None, TaskCreationOptions.None, TaskContinuationOptions.None, TaskScheduler.Default); public static TResult RunSync(Func> func) { var cultureUi = CultureInfo.CurrentUICulture; var culture = CultureInfo.CurrentCulture; return _myTaskFactory.StartNew(() => { Thread.CurrentThread.CurrentCulture = culture; Thread.CurrentThread.CurrentUICulture = cultureUi; return func(); }).Unwrap().GetAwaiter().GetResult(); } public static void RunSync(Func func) { var cultureUi = CultureInfo.CurrentUICulture; var culture = CultureInfo.CurrentCulture; _myTaskFactory.StartNew(() => { Thread.CurrentThread.CurrentCulture = culture; Thread.CurrentThread.CurrentUICulture = cultureUi; return func(); }).Unwrap().GetAwaiter().GetResult(); } } ``` [https://github.com/aspnet/AspNetIdentity/blob/main/src/Microsoft.AspNet.Identity.Core/AsyncHelper.cs](https://github.com/aspnet/AspNetIdentity/blob/main/src/Microsoft.AspNet.Identity.Core/AsyncHelper.cs) # Authentik NPM Redirect with Websocket support ```nginx # Increase buffer size for large headers # This is needed only if you get 'upstream sent too big header while reading response # header from upstream' error when trying to access an application protected by goauthentik proxy_buffers 8 16k; proxy_buffer_size 32k; location / { # Put your proxy_pass to your application here proxy_pass $forward_scheme://$server:$port; proxy_set_header Host $host; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection upgrade; proxy_set_header Accept-Encoding gzip; # authentik-specific config auth_request /outpost.goauthentik.io/auth/nginx; error_page 401 = @goauthentik_proxy_signin; auth_request_set $auth_cookie $upstream_http_set_cookie; add_header Set-Cookie $auth_cookie; # translate headers from the outposts back to the actual upstream auth_request_set $authentik_username $upstream_http_x_authentik_username; auth_request_set $authentik_groups $upstream_http_x_authentik_groups; auth_request_set $authentik_email $upstream_http_x_authentik_email; auth_request_set $authentik_name $upstream_http_x_authentik_name; auth_request_set $authentik_uid $upstream_http_x_authentik_uid; proxy_set_header X-authentik-username $authentik_username; proxy_set_header X-authentik-groups $authentik_groups; proxy_set_header X-authentik-email $authentik_email; proxy_set_header X-authentik-name $authentik_name; proxy_set_header X-authentik-uid $authentik_uid; } # all requests to /outpost.goauthentik.io must be accessible without authentication location /outpost.goauthentik.io { proxy_pass https://authentik-server-1:9443/outpost.goauthentik.io; # ensure the host of this vserver matches your external URL you've configured # in authentik proxy_set_header Host $host; proxy_set_header X-Original-URL $scheme://$http_host$request_uri; add_header Set-Cookie $auth_cookie; auth_request_set $auth_cookie $upstream_http_set_cookie; # required for POST requests to work proxy_pass_request_body off; proxy_set_header Content-Length ""; } # Special location for when the /auth endpoint returns a 401, # redirect to the /start URL which initiates SSO location @goauthentik_proxy_signin { internal; add_header Set-Cookie $auth_cookie; return 302 /outpost.goauthentik.io/start?rd=$request_uri; # For domain level, use the below error_page to redirect to your authentik server with the full redirect path # return 302 https://auth.ultimatecloud.tk/outpost.goauthentik.io/start?rd=$scheme://$http_host$request_uri; } ``` # Batching with LINQ ```c# static IEnumerable> Batch(this IEnumerable source, int batchSize) { return source.Select((item, inx) => new { item, inx }) .GroupBy(x => x.inx / batchSize) .Select(g => g.Select(x => x.item)); } ``` [https://stackoverflow.com/questions/13731796/create-batches-in-linq](https://stackoverflow.com/questions/13731796/create-batches-in-linq) # Build project with SourceGenerator on linux Add Microsoft.Net.Compilers.Toolset package to the project that references the source generator. # Change file encoding with linux To get current encoding: ```bash file -i {filename} ``` To convert it: ```bash iconv -f {sourceEncoding} -t {targetEncoding} {filename} ``` Example: ```bash iconv -f ISO_8859-1 -t UTF-8 filename.txt ``` # Docker Buildx Multi-Arch ```bash sudo docker buildx create --use --name multi-arch-builder ``` Usage: ```bash sudo docker buildx build --platform=linux/arm64 -t tag:latest -f ./DockerTest/Dockerfile --load --no-cache . ``` DockerFile: ```bash #See https://aka.ms/customizecontainer to learn how to customize your debug container and how Visual Studio uses this Dockerfile to build your images for faster debugging. FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine AS base USER app WORKDIR /app EXPOSE 8080 EXPOSE 8081 FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS build ARG BUILDPLATFORM ARG TARGETARCH ARG BUILD_CONFIGURATION=Release RUN echo "Target: $TARGETARCH" RUN echo "Build: $BUILDPLATFORM" WORKDIR /src COPY ["DockerTest/DockerTest.csproj", "DockerTest/"] RUN dotnet restore "./DockerTest/DockerTest.csproj" -a $TARGETARCH COPY . . WORKDIR "/src/DockerTest" RUN dotnet build "./DockerTest.csproj" -c $BUILD_CONFIGURATION -o /app/build -a $TARGETARCH FROM build AS publish ARG TARGETARCH ARG BUILD_CONFIGURATION=Release RUN dotnet publish "./DockerTest.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false -a $TARGETARCH FROM base AS final WORKDIR /app COPY --from=publish /app/publish . ENTRYPOINT ["dotnet", "DockerTest.dll"] ``` [https://stackoverflow.com/questions/70757791/build-linux-arm64-docker-image-on-linux-amd64-host](https://stackoverflow.com/questions/70757791/build-linux-arm64-docker-image-on-linux-amd64-host) [https://ruanbekker.medium.com/how-to-create-arm-based-container-images-with-buildx-fe917d186824](https://ruanbekker.medium.com/how-to-create-arm-based-container-images-with-buildx-fe917d186824) # Handle Exceptions with Task.WhenAll() ```c# var tasks = Enumerable.Range(0, 10).Select(async _ => await Task.Delay(1000)); var whenAll = Task.WhenAll(tasks); try { await whenAll; } catch {} if (whenAll.Exception is AggregateException ex) { //Handle Exception } ``` [https://www.youtube.com/watch?v=s\_NrqRI7Gnc&t=321s](https://www.youtube.com/watch?v=s_NrqRI7Gnc&t=321s) # Left outer join ```c# from leftTable in context.leftTable join rightTable in context.rightTable on leftTable.FKRightTable equals rightTable.Id into rightTableJoin from joinedRightTable in rightTableJoin.DefaultIfEmpty() select new { LeftData = leftTable.data, RightData = joinedRightTable?.data } ``` # List iteration using span ```c# var list = new List(); foreach(var item in CollectionsMarshal.AsSpan(list)) { } ``` Only usable if the collection is not changed during iteration (read only) # Load Assembly Dynamically In order to Copy NuGet dependecies to the output folder add this to classlibrary.csproj: ```xml true ``` Set the Output directory with ```xml $(SolutionDir)AppName\bin ``` To load Assembly the best approach is to use ```c# Assembly module = Assembly.LoadFrom(filePath); ``` To check if type A can be assigned to a variable with type B: ```c# B.IsAssignableFrom(A) ``` # macOS Defaults ### Auto-Resize Columns in column view ```bash defaults write com.apple.finder _FXEnableColumnAutoSizing -bool YES && killall Finder ``` ### Scroll to Exposé app ```bash defaults write com.apple.dock "scroll-to-open" -bool "true" && killall Dock ``` ### Make Dock icons of hidden applications translucent ```bash defaults write com.apple.dock showhidden -bool true && killall Dock ``` [https://raw.githubusercontent.com/mathiasbynens/dotfiles/refs/heads/main/.macos](https://raw.githubusercontent.com/mathiasbynens/dotfiles/refs/heads/main/.macos "https://raw.githubusercontent.com/mathiasbynens/dotfiles/refs/heads/main/.macos") [https://macos-defaults.com](https://macos-defaults.com "https://macos-defaults.com") # Mount host volumes in WSL2 Add the following to `/etc/wsl.conf` ```bash [automount] options = "metadata" ``` # Optional See Attachments # RegEx in multiple files multi-line pattern ```bash pcregrep -h -r --include=".*\.cs" -M "LogEvent\([\s\S]*?\)\;" . ``` - -h: Exclude filenames - -r: recursive - --include: include file names that matches with the pattern - -M: multi-line mode - PATTERN: match all occurrence even if it is multi-line Example: await LogEvent($"This is a test message that has embedded {property}"); ```bash pcregrep -h -r --include=".*\.cs" -o1 -M "LogEvent\(([\s\S]*?)\)\;" . ``` - -o: shows only match, not the entire line. -o{n} shows only the {n}th group - Matches only: $"This is a test message that has embedded {property}"