Garbage Collection

>ng g c product/ProductDetail
>ng g c product/ProductEdit

import { ProductEditComponent } from './product-edit/product-edit.component';
import { ProductDetailComponent } from './product-detail/product-detail.component';
import { ProductListComponent } from './product-list/product-list.component';

const routes: Routes = [
  { path: 'products', component: ProductListComponent },
  { path: 'products/:id', component: ProductDetailComponent },
  { path: 'products/:id/edit', component: ProductEditComponent }
];

 > ng g i product/IProduct

export interface IProduct {
    id: number;
    productName: string;
    productCode: string;
}

 >npm install angular-in-memory-web-api --save

"dependencies": {
   "angular-in-memory-web-api": "^0.3.1"
},

 > ng g cl product/ProductData

import { IProduct } from './iproduct';
import { InMemoryDbService, InMemoryBackendConfig } from 'angular-in-memory-web-api';

export class ProductData implements InMemoryDbService, InMemoryBackendConfig {
    createDb() {
        let products: IProduct[] = [
            {
                'id': 1,
                'productName': 'Product 1',
                'productCode': '0011'
            },
            {
                'id': 2,
                'productName': 'Product 2',
                'productCode': '0023'
            },
            {
                'id': 5,
                'productName': 'Product 5',
                'productCode': '0048'
            },
            {
                'id': 8,
                'productName': 'Product 8',
                'productCode': '0022'
            },
            {
                'id': 10,
                'productName': 'Product 10',
                'productCode': '0042'
            }
        ];
        return { products };
    }
}

import { ProductData } from './product/product-data';
import { InMemoryWebApiModule } from 'angular-in-memory-web-api';

@NgModule({
  declarations: [
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    InMemoryWebApiModule.forRoot(ProductData, { delay: 1000 }),

    ProductModule,
    UserModule,

    AppRoutingModule
  ],

 >ng g s product/product -m product/product.module

 installing service
  create src\app\product\product.service.spec.ts
  create src\app\product\product.service.ts
  update src\app\product\product.module.ts

import { Injectable } from '@angular/core';
import { Http, Response, Headers, RequestOptions } from '@angular/http';

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/throw';
import 'rxjs/add/operator/map';
import 'rxjs/add/observable/of';

import { IProduct } from './iproduct';

@Injectable()
export class ProductService {
  private baseUrl = 'api/products';

  constructor(private http: Http) { }

  getProducts(): Observable<IProduct[]> {
    return this.http.get(this.baseUrl)
      .map(this.extractData)
      .do(data => console.log('getProducts: ' + JSON.stringify(data)))
      .catch(this.handleError);
  }

  getProduct(id: number): Observable<IProduct> {
    if (id === 0) {
      return Observable.of(this.initializeProduct());
    };
    const url = `${this.baseUrl}/${id}`;
    return this.http.get(url)
      .map(this.extractData)
      .do(data => console.log('getProduct: ' + JSON.stringify(data)))
      .catch(this.handleError);
  }

  deleteProduct(id: number): Observable<Response> {
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });

    const url = `${this.baseUrl}/${id}`;
    return this.http.delete(url, options)
      .do(data => console.log('deleteProduct: ' + JSON.stringify(data)))
      .catch(this.handleError);
  }

  saveProduct(product: IProduct): Observable<IProduct> {
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });

    if (product.id === 0) {
      return this.createProduct(product, options);
    }
    return this.updateProduct(product, options);
  }

  private createProduct(product: IProduct, options: RequestOptions): Observable<IProduct> {
    product.id = undefined;
    return this.http.post(this.baseUrl, product, options)
      .map(this.extractData)
      .do(data => console.log('createProduct: ' + JSON.stringify(data)))
      .catch(this.handleError);
  }

  private updateProduct(product: IProduct, options: RequestOptions): Observable<IProduct> {
    const url = `${this.baseUrl}/${product.id}`;
    return this.http.put(url, product, options)
      .map(() => product)
      .do(data => console.log('updateProduct: ' + JSON.stringify(data)))
      .catch(this.handleError);
  }

  private extractData(response: Response) {
    let body = response.json();
    return body.data || {};
  }

  private handleError(error: Response): Observable<any> {
    console.error(error);
    return Observable.throw(error.json().error || 'Server error');
  }

  initializeProduct(): IProduct {
    // Return an initialized object
    return {
      id: 0,
      productName: null,
      productCode: null
    };
  }
}

   private baseUrl = 'api/products';

import { ActivatedRoute } from '@angular/router';
import { Component, OnInit } from '@angular/core';

import { ProductService } from './../product.service';
import { IProduct } from './../iproduct';

@Component({
  selector: 'app-product-list',
  templateUrl: './product-list.component.html',
  styleUrls: ['./product-list.component.css']
})
export class ProductListComponent implements OnInit {
  pageTitle = 'Product List';
  errorMessage: string;

  products: IProduct[];

  constructor(private productService: ProductService,
    private route: ActivatedRoute) { }

  ngOnInit(): void {
    this.productService.getProducts()
      .subscribe(products => this.products = products,
      error => this.errorMessage = <any>error);
  }
}

<div class="panel panel-default">
  <div class="panel-heading">
    {{pageTitle}}
  </div>

  <div class="panel-body">
    <div class="has-error" *ngIf="errorMessage">{{errorMessage}}</div>

    <div class="table-responsive">
      <table class="table" *ngIf="products && products.length">
        <thead>
          <tr>
            <th>Product</th>
            <th>Code</th>
          </tr>
        </thead>
        <tbody>
          <tr *ngFor="let product of products">
            <td><a [routerLink]="['/products', product.id]">
                  {{product.productName}}
                </a>
            </td>
            <td>{{ product.productCode}}</td>
            <td>
              <a class="btn btn-primary" [routerLink]="['/products', product.id, 'edit']">
                Edit
              </a>
            </td>
          </tr>
        </tbody>
      </table>
    </div>
  </div>
</div>

<a [routerLink]="['/products', product.id]">
                  {{product.productName}}
</a>

<a class="btn btn-primary" [routerLink]="['/products', product.id, 'edit']">
     Edit
</a>

<li>
      <a [routerLink]="['/products', 0, 'edit']">Add Product</a>
</li>

  saveProduct(product: IProduct): Observable<IProduct> {
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });

    if (product.id === 0) {
      return this.createProduct(product, options);
    }
    return this.updateProduct(product, options);
  }

 this.router.navigate(['products', this.product.id]);

 let id = +this.route.snapshot.params['id'];

 { path: 'products/:id', component: ProductDetailComponent }

<a [routerLink]="['/products', product.id]">{{product.productName}}</a>

this.route.params.subscribe(
         params => {
            let id = +params['id'];
            this.getProduct(id);
         }
      );

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute } from '@angular/router';

import { ProductService } from './../product.service';
import { IProduct } from './../iproduct';

@Component({
  selector: 'app-product-detail',
  templateUrl: './product-detail.component.html',
  styleUrls: ['./product-detail.component.css']
})
export class ProductDetailComponent implements OnInit {
  pageTitle = 'Product Detail';
  product: IProduct;
  errorMessage: string;

  constructor(private productService: ProductService,
    private route: ActivatedRoute) { }

  ngOnInit(): void {
    let id = +this.route.snapshot.params['id'];
    this.getProduct(id);
  }

  getProduct(id: number) {
    this.productService.getProduct(id).subscribe(
      product => this.product = product,
      error => this.errorMessage = <any>error);
  }
}

<div class="panel panel-primary" *ngIf="product">
  <div class="panel-heading" style="font-size:large">
    {{pageTitle + ": " + product.productName}}
  </div>

  <div class="panel-body">
    <div>
      Name: {{product.productName}}
    </div>
    <div>
      Code: {{product.productCode}}
    </div>
    <div class="has-error" *ngIf="errorMessage">{{errorMessage}}</div>
  </div>

  <div class="panel-footer">
    <a class="btn btn-default" [routerLink]="['/products']">
      <i class="glyphicon glyphicon-chevron-left"></i> Back
    </a>
    <a class="btn btn-primary" style="width:80px;margin-left:10px" 
       [routerLink]="['/products', product.id, 'edit']">
       Edit
    </a>
  </div>
</div>

import { FormsModule } from '@angular/forms';

@NgModule({
  imports: [
    CommonModule,
    FormsModule,
    ProductRoutingModule
  ]

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute, Router } from '@angular/router';

import { ProductService } from './../product.service';
import { IProduct } from './../iproduct';

@Component({
  selector: 'app-product-edit',
  templateUrl: './product-edit.component.html',
  styleUrls: ['./product-edit.component.css']
})
export class ProductEditComponent implements OnInit {
  pageTitle = 'Product Edit';
  product: IProduct;
  errorMessage: string;

  constructor(private productService: ProductService,
    private route: ActivatedRoute,
    private router: Router) { }

  ngOnInit(): void {
    let id = +this.route.snapshot.params['id'];
    this.getProduct(id);
  }

  getProduct(id: number): void {
    this.productService.getProduct(id)
      .subscribe(
      (product: IProduct) => this.onProductRetrieved(product),
      (error: any) => this.errorMessage = <any>error
      );
  }

  onProductRetrieved(product: IProduct): void {
    this.product = product;

    if (this.product.id === 0) {
      this.pageTitle = 'Add Product';
    } else {
      this.pageTitle = `Edit Product: ${this.product.productName}`;
    }
  }

  deleteProduct(): void {
    if (this.product.id === 0) {
      // Don't delete, it was never saved.
      this.onSaveComplete();
    } else {
      if (confirm(`Really delete the product: ${this.product.productName}?`)) {
        this.productService.deleteProduct(this.product.id)
          .subscribe(
          () => this.onSaveComplete(`${this.product.productName} was deleted`),
          (error: any) => this.errorMessage = <any>error
          );
      }
    }
  }

  saveProduct(): void {
    if (true === true) {
      this.productService.saveProduct(this.product)
        .subscribe(
        () => this.onSaveComplete(`${this.product.productName} was saved`),
        (error: any) => this.errorMessage = <any>error
        );
    } else {
      this.errorMessage = 'Please correct the validation errors.';
    }
  }

  onSaveComplete(message?: string): void {
    if (message) {
      // TODO: show msg
    }

    // Navigate back to the product list
    this.router.navigate(['/products']);
  }
}

<div class="panel panel-primary">
  <div class="panel-heading">
    {{pageTitle}}
  </div>

  <div class="panel-body" *ngIf="product">
    <form class="form-horizontal" novalidate (ngSubmit)="saveProduct()" #productForm="ngForm">
      <fieldset>
        <div class="form-group" [ngClass]="{'has-error': (productNameVar.touched || 
                                               productNameVar.dirty) && 
                                               !productNameVar.valid }">
          <label class="col-md-2 control-label" for="productNameId">Product Name</label>

          <div class="col-md-8">
            <input class="form-control" id="productNameId" type="text" placeholder="Name (required)" 
                   required minlength="3" [(ngModel)]=product.productName 
                   name="productName" #productNameVar="ngModel" />
            <span class="help-block" *ngIf="(productNameVar.touched ||
                                                         productNameVar.dirty) &&
                                                         productNameVar.errors">
                <span *ngIf="productNameVar.errors.required">
                    Product name is required.
                </span>
                <span *ngIf="productNameVar.errors.minlength">
                    Product name must be at least three characters.
                </span>
            </span>
          </div>
        </div>

        <div class="form-group" [ngClass]="{'has-error': (productCodeVar.touched || 
                                               productCodeVar.dirty) && 
                                               !productCodeVar.valid }">
          <label class="col-md-2 control-label" for="productCodeId">Product Code</label>

          <div class="col-md-8">
            <input class="form-control" id="productCodeId" type="text" placeholder="Code (required)" 
                   required [(ngModel)]=product.productCode
                   name="productCode" #productCodeVar="ngModel" />
            <span class="help-block" *ngIf="(productCodeVar.touched ||
                                                         productCodeVar.dirty) &&
                                                         productCodeVar.errors">
                <span *ngIf="productCodeVar.errors.required">
                     Product code is required.
                </span>
            </span>
          </div>
        </div>

        <div class="form-group">
          <div class="col-md-4 col-md-offset-2">
            <span>
                 <button class="btn btn-primary"
                         type="submit"
                         style="width:80px;margin-right:10px"
                         [disabled]="!productForm.valid"
                         (click)="saveProduct()">
                         Save
                 </button>
             </span>
             <span>
                 <a class="btn btn-default"
                    [routerLink]="['/products']">
                       Cancel
                 </a>
             </span>
             <span>
                 <a class="btn btn-default"
                    (click)="deleteProduct()">
                     Delete
                  </a>
             </span>
          </div>
        </div>
      </fieldset>
    </form>
    <div class="has-error" *ngIf="errorMessage">{{errorMessage}}</div>
  </div>
</div>

ngOnInit(): void {
    let id = +this.route.snapshot.params['id'];
    this.getProduct(id);
  }

  ngOnInit(): void {
    this.route.params.subscribe(
      params => {
        let id = +params['id'];
        this.getProduct(id);
      }
    );
  }

    // For Angular 4+
    let id = +this.route.snapshot.paramMap.get('id');
    this.getProduct(id);

    // OR
    this.route.paramMap.subscribe(params => {
          let id = +params['id'];
          this.getProduct(id);
        });

 { path: 'products/:name/:code', component: ProductListComponent }

 [routerLink]="['/products', productName, productCode]"

 { path: 'products', component: ProductListComponent },

 [routerLink]="['/products', {name: productName, code: productCode}]"

 http://localhost:4200/products;name=Controller;code=gmg

let name = this.route.snapshot.params['name'];
let code = this.route.snapshot.params['code'];

 http://localhost:42000/products/5?filterBy=product1

 { path: 'products', component: ProductListComponent}

<a [routerLink] = "['/products', product.id]"
     [queryParams] = "{ filterBy: 'er', showImage: true }">
{{product.productName}}
</a>

this.router.navigate(['/products'],
   {
       queryParams: { filterBy: 'er', showImage: true}
   }
);

 [preserveQueryParams] = "true"

<a class="btn btn-default"
           [routerLink]="['/products']"
           [preserveQueryParams]="true">
            <i class="glyphicon glyphicon-chevron-left"></i> Back
</a>

this.router.navigate(['/products'],
   { queryParamsHandling: 'preserve'}
);

var filter = this.route.snapshot.queryParams['filterBy'] || '';
var showImage = this.route.snapshot.queryParams['showImage'] === 'true';

 >ng g p product/ProductFilter

import { PipeTransform, Pipe } from '@angular/core';
import { IProduct } from './iproduct';

@Pipe({
  name: 'productFilter'
})
export class ProductFilterPipe implements PipeTransform {
  transform(value: IProduct[], filterBy: string): IProduct[] {
    filterBy = filterBy ? filterBy.toLocaleLowerCase() : null;
    return filterBy ? value.filter((product: IProduct) =>
      product.productName.toLocaleLowerCase().indexOf(filterBy) !== -1) : value;
  }
}

  <div class="panel-body">
    <div class="row">
            <div class="col-md-2">Filter by:</div>
            <div class="col-md-4">
                <input type="text" [(ngModel)]="listFilter" />
            </div>
    </div>
    <div class="row" *ngIf="listFilter">
            <div class="col-md-6">
                <h3>Filtered by: {{listFilter}} </h3>
            </div>
    </div>

<tr *ngFor="let product of products | productFilter:listFilter">
            <td><a [routerLink]="['/products', product.id]"
                   [queryParams]="{filterBy: listFilter}">
                  {{product.productName}}
                </a>
            </td>

@Component({
  selector: 'app-product-list',
  templateUrl: './product-list.component.html',
  styleUrls: ['./product-list.component.css']
})
export class ProductListComponent implements OnInit {
  listFilter: string;

  ngOnInit(): void {
    this.listFilter = this.route.snapshot.queryParams['filterBy'] || '';

public class OrderProductVarientModel
    {
       public int OrderProductVarientId
        {
            get;
            set;
        }
    }

  .MainTableDataSource(dataSource =>
            {
                var listOfRows = new List<OrderProductVarientModel>();
                for (int i = 0; i < orderProductVariants.Count; i++)
                {
                    listOfRows.Add(new OrderProductVarientModel { OrderProductVarientId = orderProductVariants[i].OrderProductVariantId });
                }
                dataSource.StronglyTypedList(listOfRows);
                //dataSource.StronglyTypedList(orderProductVariants);
            })

var first = someArray[0];
var second = someArray[1];
var third = someArray[2];

 var [first, second, third] = someArray;

 let [one, two, three] = ['globin', 'ghoul', 'ghost', 'white walker'];
console.log(`one is ${one}, two is ${two}, three is ${three}`)
// => one is globin, two is ghoul, three is ghost

 let [firstMonster, , , fourthMonster] =  ['globin', 'ghoul', 'ghost', 'white walker'];
console.log(`the first monster is ${firstMonster}, the fourth is ${fourthMonster}`)
// => one is globin, two is ghoul, three is ghost

 let nested = [1, [2, 3], 4];
let [a, [b], d] = nested;
console.log(a); // 1
console.log(b); // 2
console.log(d); // 4

 let point = [1, 2];
let [xVal, yVal] = point;
[xVal, yVal] = [yVal, xVal];
console.log(xVal); // 2
console.log(yVal); // 1

 let pouch = {coins: 10};

 let coins = pouch.coins;

 let {coins} = pouch;

 let pouch = {coins: 10};
let {coins: newVar1 } = pouch;
console.log(newVar1); //10

let point = {
    x: 1,
    y: 2,
    z: {
         one: 3,
         two: 4
    }
};
let { x: a, y: b, z: { one: c, two: d } } = point;
console.log(a); // 1
console.log(b); // 2
console.log(c); // 3
console.log(d); // 4

let mixed = {
    one: 1,
    two: 2,
    values: [3, 4, 5]
};
let { one: a, two: b, values: [c, , e] } = mixed;
console.log(a); // 1
console.log(b); // 2
console.log(c); // 3
console.log(e); // 5

 function removeBreakpoint({ url, line, column }) {
  // ...
}

 function random ({ min=1, max=300 }) {
    return Math.floor(Math.random() * (max - min)) + min
}
console.log(random({}))
// <- 174
console.log(random({max: 24}))
// <- 18

 jQuery.ajax = function (url, {
  async = true,
  beforeSend = noop,
  cache = true,
  complete = noop,
  crossDomain = false,
  global = true,
  // ... more config
}) {
    // ... do stuff
};
 

 function returnMultipleValues() {
     return [1, 2];
}
var [foo, bar] = returnMultipleValues();

function returnMultipleValues() {
  return {
            foo: 1,
            bar: 2
     };
}
var { foo, bar } = returnMultipleValues();

var {foo=3} = { bar: 2 }
console.log(foo)
// <- 3

var {foo=3} = { foo: 2 }
console.log(foo)
// <- 2

var {foo=3} = { foo: undefined }
console.log(foo)
// <- 3

var [b=10] = [undefined]
console.log(b)
// <- 10

var [c=10] = []
console.log(c)
// <- 10

function inc(number, increment) {
        increment = increment || 1;
        return number + increment;
}
console.log(inc(2, 2)); // 4
console.log(inc(2)); // 3

function inc(number, increment = 1) {
        return number + increment;
}
console.log(inc(2, 2)); // 4
console.log(inc(2)); // 3

function sum(a, b = 2, c) {
     return a + b + c;
}
console.log(sum(1, 5, 10)); // 16 -> b === 5
console.log(sum(1, undefined, 10)); // 13 -> b as default

 function getDefaultIncrement() {
    return 1;
}
function inc(number, increment = getDefaultIncrement()) {
    return number + increment;
}
console.log(inc(2, 2)); // 4
console.log(inc(2)); // 3

function sum(a, b, c) {
   return a + b + c;
}

 var args = [1, 2, 3];
console.log(sum(…args)); // 6

var args = [1, 2];
console.log(sum(…args, 3)); // 6

 a = list[0], rest = list.slice(1)

 [a, ...rest] = list

 [1, 2].concat(more)

[1, 2, ...more]

 list.push.apply(list, [3, 4])

 list.push(...[3, 4])

function sum() {
     var numbers = Array.prototype.slice.call(arguments),
     result = 0;
     numbers.forEach(function (number) {
          result += number;
    });
    return result;
}

console.log(sum(1)); // 1
console.log(sum(1, 2, 3, 4, 5)); // 15

function sum(…numbers) {
      var result = 0;
      numbers.forEach(function (number) {
          result += number;
      });
      return result;
}
console.log(sum(1)); // 1
console.log(sum(1, 2, 3, 4, 5)); // 15

 function sum(…numbers, last) { // causes a syntax error

static async IAsyncEnumerable<int> RangeAsync(int start, int count)
{
  for (int i = 0; i < count; i++)
  {
    await Task.Delay(i);
    yield return start + i;
  }
}

    [ApiController]
    [Route("[controller]")]
    public class CustomerController : ControllerBase
    {
        private readonly IDictionary<int, Customer> _customers;
        private void FillCustomerFromMemory(int countOfCustomer)
        {
            for (int CustomerId = 1; CustomerId <= countOfCustomer; CustomerId++)
            {
                _customers.Add(key: CustomerId, new Customer($"name_{CustomerId}", CustomerId));
            }
        }
        public CustomerController()
        {
            _customers = new Dictionary<int, Customer>();
            FillCustomerFromMemory(countOfCustomer : 100);
        }
        [HttpGet]
        public async Task<IEnumerable<Customer>> Get()
        {
            var output = new List<Customer>();
            while (_customers.Any(_ => _.Key % 10 == 0))
            {
                var customer = _customers.First(_ => _.Key % 10 == 0);
                output.Add(new Customer(customer.Value.Name, customer.Key));
                await Task.Delay(500);
                _customers.Remove(customer);
            }
            return output;
        }

        public class Customer
        {
            public int Id { get; private set; }

            public string Name { get; private set; }
            public Customer(string name, int id)
            {
                Name = name;
                Id = id;
            }
        }
    }

  [HttpGet]
        public async IAsyncEnumerable<Customer> Get()
        {
            while (_customers.Any(_ => _.Key % 10 == 0))
            {
                var customer = _customers.First(_ => _.Key % 10 == 0);
                yield return new Customer(customer.Value.Name, customer.Key);
                _customers.Remove(customer);
                await Task.Delay(500);
            }
        }

const int TARGET = 80;
var _httpClient = new HttpClient();
using (var response = await _httpClient.GetAsync(
    "https://localhost:7284/customer",
     HttpCompletionOption.ResponseHeadersRead))
{
    var stream = await response.Content.ReadAsStreamAsync();

    var _jsonSerializerSettings = new JsonSerializerSettings();
    var _serializer = Newtonsoft.Json.JsonSerializer.Create(_jsonSerializerSettings);

    using TextReader textReader = new StreamReader(stream);
    using JsonReader jsonReader = new JsonTextReader(textReader);

    await using (stream.ConfigureAwait(false))
    {
        await jsonReader.ReadAsync().ConfigureAwait(false);
        while (await jsonReader.ReadAsync().ConfigureAwait(false) &&
               jsonReader.TokenType != JsonToken.EndArray)
        {
            Customer customer = _serializer!.Deserialize<Customer>(jsonReader);
            if (customer.Id == TARGET)
            {
                Console.WriteLine(customer.Id + " : " + customer.Name);
                break;
            }
        }
    }
}

[HttpGet]
        public async IAsyncEnumerable<Customer> Get(CancellationToken cancellationToken)
        {
            while (!cancellationToken.IsCancellationRequested && _customers.Any(_ => _.Key % 10 == 0))
            {
                var customer = _customers.First(_ => _.Key % 10 == 0);
                yield return new Customer(customer.Value.Name, customer.Key);
                _customers.Remove(customer);
                await Task.Delay(500,cancellationToken);
            }
        }

const int TARGET = 80;
var _httpClient = new HttpClient();
var _cancelationTokenSource = new CancellationTokenSource();

using (var response = await _httpClient.GetAsync(
    "https://localhost:7284/customer",
     HttpCompletionOption.ResponseHeadersRead,
     _cancelationTokenSource.Token))
{
    var stream = await response.Content.ReadAsStreamAsync(_cancelationTokenSource.Token);

    var _jsonSerializerSettings = new JsonSerializerSettings();
    var _serializer = Newtonsoft.Json.JsonSerializer.Create(_jsonSerializerSettings);

    using TextReader textReader = new StreamReader(stream);
    using JsonReader jsonReader = new JsonTextReader(textReader);

    await using (stream.ConfigureAwait(false))
    {
        await jsonReader.ReadAsync(_cancelationTokenSource.Token).ConfigureAwait(false);
        while (await jsonReader.ReadAsync(_cancelationTokenSource.Token).ConfigureAwait(false) &&
               jsonReader.TokenType != JsonToken.EndArray)
        {
            Customer customer = _serializer!.Deserialize<Customer>(jsonReader);
            if (customer.Id == TARGET)
            {
                Console.WriteLine(customer.Id + " : " + customer.Name);
                _cancelationTokenSource.Cancel();
                break;
            }
        }
    }
}

  var manager = new breeze.EntityManager({  
  dataService: dataService,          
  metadataStore: metadataStore,                     
  saveOptions: new breeze.SaveOptions({    allowConcurrentSaves: true, tag: [{}] })   
                 });

var dataService = new breeze.DataService({  
serviceName: "/breeze/"+ "Automobile",             
hasServerMetadata: false,
namingConvention: breeze.NamingConvention.camelCase        
});
var metadataStore = new breeze.MetadataStore({});

[BreezeController]
public class AutomobileController : ApiController
    {
        readonly EFContextProvider<ApplicationDbContext> _contextProvider =
        new EFContextProvider<ApplicationDbContext>();
        [HttpGet]
        public string Metadata()
        {
            return _contextProvider.Metadata();
        }
        [HttpGet]
        public IQueryable<Customer> Customers() {
           return _contextProvider.Context.Customers;
        }

        [System.Web.Http.HttpPost]
        public SaveResult SaveChanges(JObject saveBundle)
        {
           _contextProvider.BeforeSaveEntitiesDelegate = BeforeSaveEntities;
           _contextProvider.AfterSaveEntitiesDelegate = afterSaveEntities;
            return _contextProvider.SaveChanges(saveBundle);
        }
protected Dictionary<Type, List<EntityInfo>> BeforeSaveEntities(Dictionary<Type, List<EntityInfo>> saveMap)
        {
        }
private void afterSaveEntities(Dictionary<Type, List<EntityInfo>> saveMap, List<KeyMapping> keyMappings)
        {
        }
    }

1. Forgotten await

2. Ignoring tasks

3. Using async void methods

4. Blocking on tasks with .Result or .Wait

5. Mixing ForEach with async methods

and ...