C# Asp.Net code snippets

How to create a nuget package ?#

On .csproj file, make sure <GeneratePackageOnBuild>true</GeneratePackageOnBuild> presented, then when building Release we would have .nupkg file. Then push it up to dotnet nuget like push -s http"//localhost:5555/v3/index.json .\bin\Release\Some.Pkg.1.0.0.nupkg

Entity Framework Core#

EF Core CLI#

Install Entity Framework Core tools first.

// Make sure starting project and targeted on Package Manage Console match
Get-Migration --Context [DbContextName - Optional]
Add-Migration [MigrationName] --Context [DbContextName - Optional]
Update-Database [MigrationName - Optional] --Context [DbContextName - Optional]
Remove-Migration --Context [DbContextName - Optional]
Script-Migration [From_MigrationName] [To_MigrationName] --Context [DbContextName - Optional]

// cd to folder that contain csproj that have `Microsoft.EntityFrameworkCore.Design` or `Microsoft.EntityFrameworkCore.Tools` package installed
dotnet ef migrations list --context [DbContextName - Optional]
dotnet ef migrations add [MigrationName] --context [DbContextName - Optional] --output-dir [Path to desire place to store migration - Optional]
dotnet ef database update [MigrationName - Optional] --context [DbContextName - Optional]
dotnet ef database update 0 --context [DbContextName - Optional] # Revert all the migrations was ever migrate to the Db
dotnet ef migrations remove --context [DbContextName - Optional]
dotnet ef migrations script [From_MigrationName] [To_MigrationName - Optional] --context [DbContextName - Optional]

App monitoring#

# The two need to be on the same net
docker network create -d bridge monitoring-local

# Prometheus
docker run -d -–net=monitoring-local --name=prometheus --hostname=prometheus-local -p 9090:9090 -v I:/prometheus.yml:/etc/prometheus/prometheus.yml prom/prometheus

# Grafana
docker run -d -–net=monitoring-local --name=grafana-local -p 9091:3000 grafana/grafana

# my global config
global:
  scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).

# Alertmanager configuration
alerting:
  alertmanagers:
    - static_configs:
        - targets:
          # - alertmanager:9093

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'

    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.

    static_configs:
      - targets: ['localhost:9090']
  - job_name: 'barebone-api'
    static_configs:
      - targets: ['localhost:5000']
    metrics_path: '/metrics-text'

Better example of prometheus configuration file

Some basic libs:#

• App.Metrics.AspNetCore
• App.Metrics.AspNetCore.Endpoints
• App.Metrics.AspNetCore.Tracking
• App.Metrics.Formatters.Prometheus

// Some others register
services.AddMetrics();
// Some others register

Host.CreateDefaultBuilder(args)
  .UseMetricsWebTracking()
  .UseMetrics(opts =>
  {
      opts.EndpointOptions = endpointsOptions =>
      {
          endpointsOptions.MetricsTextEndpointOutputFormatter = new MetricsPrometheusTextOutputFormatter();
          endpointsOptions.MetricsEndpointOutputFormatter = new MetricsPrometheusProtobufOutputFormatter();
          endpointsOptions.EnvironmentInfoEndpointEnabled = false;
      };
  });

Some useful things#

# Generate private key
openssl ecparam -genkey -name prime256v1 -noout -out ec-prime256v1-priv-dev.pem

# Generate public key
openssl ec -in ec-prime256v1-priv-dev.pem -pubout -out ec-prime256v1-pub-dev.pem