changhuixu

function deco(
  target: any,
  propertyKey: string,
  descriptor: PropertyDescriptor
) {
  console.log(`method "${propertyKey}" decorator: begin`);
  if (descriptor === undefined) {
    descriptor = Object.getOwnPropertyDescriptor(target, propertyKey);
  }
  const originalMethod = descriptor.value;

changhuixu

    public class WebBlogsDbContext : Microsoft.EntityFrameworkCore.DbContext
    {
        public virtual DbSet<Author> Authors { get; protected set; }

        public WebBlogsDbContext(DbContextOptions options) : base(options)
        {
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {

changhuixu

// Author.cs
public class Author
{
    public int Id { get; protected set; }
    public string FirstName { get; protected set; }
    public string LastName { get; protected set; }
    private readonly List<Blog> _blogs = new List<Blog>();
    public IReadOnlyCollection<Blog> Blogs => _blogs;
}

changhuixu

// AuthorEntityTypeConfiguration.cs
internal class AuthorEntityTypeConfiguration : IEntityTypeConfiguration<Author>
{
    public void Configure(EntityTypeBuilder<Author> builder)
    {
        builder.ToTable("Authors");
        builder.HasKey(x => x.Id);

        builder.Property(x => x.Id).HasColumnName("Id").ValueGeneratedOnAdd();
        builder.Property(x => x.FirstName).HasColumnName("FirstName").HasMaxLength(50).IsRequired();

changhuixu

export class CanvasAnimation {
  private readonly context: CanvasRenderingContext2D;

  constructor(private readonly canvas: HTMLCanvasElement) {
    this.context = this.canvas.getContext('2d');
    window.requestAnimationFrame(() => this.draw());
  }

  draw() {
    // do stuff

changhuixu

private calculateMouseRelativePositionInCanvas(e: MouseEvent) {
  // Note: I have handled scroll effect
  this.mousePosition.x =
    e.clientX +
    (document.documentElement.scrollLeft || document.body.scrollLeft) -
    this.canvas.offsetLeft;
  this.mousePosition.y =
    e.clientY +
    (document.documentElement.scrollTop || document.body.scrollTop) -
    this.canvas.offsetTop;

changhuixu

export class CsvDataService {
  static exportToCsv(filename: string, rows: object[]) {
    if (!rows || !rows.length) {
      return;
    }
    const separator = ',';
    const keys = Object.keys(rows[0]);
    const csvContent =
      keys.join(separator) +
      '\n' +

changhuixu

import { Injectable, Inject } from '@angular/core';
import { ReplaySubject, Observable, forkJoin } from 'rxjs';
import { DOCUMENT } from '@angular/common';

@Injectable({
  providedIn: 'root'
})
export class QuillEditorService {
  private _loadedLibraries: { [url: string]: ReplaySubject<any> } = {};

changhuixu

declare var Quill: any;

@Component({
  //...
})
export class QuillEditorComponent implements OnInit {

  constructor(
    // ...
    private readonly svc: QuillEditorService,

changhuixu

public class LotNamesCache : ILotNamesCache
{
    public const string CacheKey = nameof(LotNamesCache);
    private readonly ImmutableCacheDbContext _dbContext;
    private readonly IMemoryCache _cache;

    public LotNamesCache(ImmutableCacheDbContext dbContext, IMemoryCache cache)
    {
        _dbContext = dbContext;
        _cache = cache;