• Elements عناصر
  
• Sequences توالی‌ها
  

1- یک کلاس معمولی تنها می‌تواند از یک کلاس Abstract ارث بری کند ولی همان کلاس میتواند از چندین Interface ارث ببرد.

4- وقتی شما متدی را به کلاس Abstract اضافه می‌کنید، به طور خودکار به همه زیر کلاسها اعمال می‌شود؛ اما در Interface اگر متدی اضافه کنید باید در تمام زیر کلاسها آن را اعمال کنید . 

a:first

p:odd

p:even

<table id="languages">
     <thead>
          <tr>
               <th>Language</th>
               <th>Type</th>
               <th>Invented</th>
          </tr>
     </thead>
<tbody>
<tr>
     <td>Java</td>
     <td>Static</td>
     <td>1995</td>
</tr>
<tr>
     <td>Ruby</td>
     <td>Dynamic</td>
     <td>1993</td>
</tr>
<tr>
     <td>Smalltalk</td>
     <td>Dynamic</td>
     <td>1972</td>
</tr>
<tr>
     <td>C++</td>
     <td>Static</td>
     <td>1983</td>
</tr>
</tbody>
</table>

├───authentication
│   ├───access-denied
│   └───login
├───core
│   ├───component
│   │   └───header
│   ├───models
│   └───services
├───dashboard
│   ├───call-protected-api
│   └───protected-page
├───page-not-found
├───shared
│   └───directives
└───welcome

 public static IEnumerable<TResult> Empty<TResult>()

IEnumerable<Ingredient> ingredients = Enumerable.Empty<Ingredient>();
Console.WriteLine(ingredients.Count());

 0

5
6
7
8
9
10

42
42
42
42
42
42

int[] nums = {1, 2, 3};
bool isTowThere = nums.Contains(2);
bool isFiveThere = nums.Contains(5);

Console.WriteLine(isTowThere);
Console.WriteLine(isFiveThere);

True
False

int[] nums = { 1, 2, 3 };
IEnumerable<int> noNums = Enumerable.Empty<int>();

Console.WriteLine(nums.Any());
Console.WriteLine(noNums.Any());

True
False

int[] nums = { 1, 2, 3 };
bool areAnyEvenNumbers = nums.Any(x => x % 2 == 0);
Console.WriteLine(areAnyEvenNumbers);

 True

Ingredient[] ingredients =
{
new Ingredient { Name = "Sugar", Calories = 500 },
new Ingredient { Name = "Egg", Calories = 100 },
new Ingredient { Name = "Milk", Calories = 150 },
new Ingredient { Name = "Flour", Calories = 50 },
new Ingredient { Name = "Butter", Calories = 400 }
};
bool isLowFatRecipe = ingredients.All(x => x.Calories < 200);
Console.WriteLine(isLowFatRecipe);

False

IEnumerable<int> sequence1 = new[] {1, 2, 3};
IEnumerable<int> sequence2 = new[] { 1, 2, 3 };
bool isSeqEqual = sequence1.SequenceEqual(sequence2);
Console.WriteLine(isSeqEqual);

 True

IEnumerable<int> sequence1 = new[] { 1, 2, 3 };
IEnumerable<int> sequence2 = new[] { 3, 2, 1 };
bool isSeqEqual = sequence1.SequenceEqual(sequence2);
Console.WriteLine(isSeqEqual);

False

int[] nums = { 1, 2, 3 };
int numberOfElements = nums.Count();
Console.WriteLine(numberOfElements);

 3

int[] nums = { 1, 2, 3 };
int numberOfEvenElements = nums.Count(x => x % 2 == 0);
Console.WriteLine(numberOfEvenElements);

int[] nums = { 1, 2, 3 };
int total = nums.Sum();
Console.WriteLine(total);

 6

Ingredient[] ingredients =
{
new Ingredient { Name = "Sugar", Calories = 500 },
new Ingredient { Name = "Egg", Calories = 100 },
new Ingredient { Name = "Milk", Calories = 150 },
new Ingredient { Name = "Flour", Calories = 50 },
new Ingredient { Name = "Butter", Calories = 400 }
};
int totalCalories = ingredients.Sum(x => x.Calories);
Console.WriteLine(totalCalories);

 1200

int[] nums = { 1, 2, 3 };
var avg = nums.Average();
Console.WriteLine(avg);

 2

Ingredient[] ingredients =
{
new Ingredient { Name = "Sugar", Calories = 500 },
new Ingredient { Name = "Egg", Calories = 100 },
new Ingredient { Name = "Milk", Calories = 150 },
new Ingredient { Name = "Flour", Calories = 50 },
new Ingredient { Name = "Butter", Calories = 400 }
};
var avgCalories = ingredients.Average(x => x.Calories);
Console.WriteLine(avgCalories);

 240

int[] nums = { 3, 2, 1 };
var smallest = nums.Min();
Console.WriteLine(smallest);

 1

Ingredient[] ingredients =
{
new Ingredient { Name = "Sugar", Calories = 500 },
new Ingredient { Name = "Egg", Calories = 100 },
new Ingredient { Name = "Milk", Calories = 150 },
new Ingredient { Name = "Flour", Calories = 50 },
new Ingredient { Name = "Butter", Calories = 400 }
};
var smallestCalories = ingredients.Min(x => x.Calories);
Console.WriteLine(smallestCalories);

int[] nums = { 1 ,3, 2 };
var largest = nums.Max();
Console.WriteLine(largest);

 3

int[] nums = {1, 2, 3};
var result = nums.Aggregate(0,
(currentElement, runningTotal) => runningTotal + currentElement);
Console.WriteLine(result);

 6

 int[] nums = { 1, 2, 3 ,4,5};
var result = nums.Aggregate((runningProduct, nextfactor) => runningProduct * nextfactor);
Console.WriteLine(result);

 120

> npm install bootstrap --save
> npm install ngx-bootstrap --save

  "apps": [
    {
      "styles": [
    "../node_modules/bootstrap/dist/css/bootstrap.min.css",
        "styles.css"
      ],

import { PaginationModule } from "ngx-bootstrap";

@NgModule({
  imports: [
    PaginationModule.forRoot()
  ]

 >ng g m SimpleGrid -m app.module --routing

 >ng g c SimpleGrid/products-list

 >ng g cl SimpleGrid/app-product

export class AppProduct {
  constructor(
    public productId: number,
    public productName: string,
    public price: number,
    public isAvailable: boolean
  ) {}
}

 >ng g cl SimpleGrid/PagedQueryModel

export class PagedQueryModel {
  constructor(
    public sortBy: string,
    public isAscending: boolean,
    public page: number,
    public pageSize: number
  ) {}
}

 >ng g cl SimpleGrid/PagedQueryResult

export class PagedQueryResult<T> {
  constructor(public totalItems: number, public items: T[]) {}
}

 >ng g cl SimpleGrid/GridColumn

export class GridColumn {
  constructor(
    public title: string,
    public propertyName: string,
    public isSortable: boolean
  ) {}
}

 >ng g s SimpleGrid/products-list -m simple-grid.module

  toQueryString(obj: any): string {
    const parts = [];
    for (const key in obj) {
      if (obj.hasOwnProperty(key)) {
        const value = obj[key];
        if (value !== null && value !== undefined) {
          parts.push(encodeURIComponent(key) + "=" + encodeURIComponent(value));
        }
      }
    }
    return parts.join("&");
  }

[HttpGet("[action]")]
public PagedQueryResult<Product> GetPagedProducts(ProductQueryViewModel queryModel)

 http://localhost:5000/api/Product/GetPagedProducts?sortBy=productId&isAscending=true&page=2&pageSize=7

@Injectable()
export class ProductsListService {
  private baseUrl = "api/Product";

  constructor(private http: Http) {}

  getPagedProductsList(
    queryModel: PagedQueryModel
  ): Observable<PagedQueryResult<AppProduct>> {
    return this.http
      .get(`${this.baseUrl}/GetPagedProducts?${this.toQueryString(queryModel)}`)
      .map(res => {
        const result = res.json();
        return new PagedQueryResult<AppProduct>(
          result.totalItems,
          result.items
        );
      });
  }

  <table class="table table-striped table-hover table-bordered table-condensed">
    <thead>
      <tr>
        <th class="text-center" style="width:3%">#</th>
        <th *ngFor="let column of columns" class="text-center">
          <div *ngIf="column.isSortable" (click)="sortBy(column.propertyName)" style="cursor: pointer">
            {{ column.title }}
            <i *ngIf="queryModel.sortBy === column.propertyName" class="glyphicon"
              [class.glyphicon-sort-by-order]="queryModel.isAscending" [class.glyphicon-sort-by-order-alt]="!queryModel.isAscending"></i>
          </div>
          <div *ngIf="!column.isSortable" style="cursor: pointer">
            {{ column.title }}
          </div>
        </th>
      </tr>
    </thead>

export class ProductsListComponent implements OnInit {
  columns: GridColumn[] = [
    new GridColumn("Id", "productId", true),
    new GridColumn("Name", "productName", true),
    new GridColumn("Price", "price", true),
    new GridColumn("Available", "isAvailable", true)
  ];

export class ProductsListComponent implements OnInit {
  itemsPerPage = 7;
  queryModel = new PagedQueryModel("productId", true, 1, this.itemsPerPage);

  sortBy(columnName) {
    if (this.queryModel.sortBy === columnName) {
      this.queryModel.isAscending = !this.queryModel.isAscending;
    } else {
      this.queryModel.sortBy = columnName;
      this.queryModel.isAscending = true;
    }
    this.getPagedProductsList();
  }
}

    <tbody>
      <tr *ngFor="let item of queryResult.items; let i = index">
        <td class="text-center">{{ itemsPerPage * (currentPage - 1) + i + 1 }}</td>
        <td class="text-center">{{ item.productId }}</td>
        <td class="text-center">{{ item.productName }}</td>
        <td class="text-center">{{ item.price | number:'.0' }}</td>
        <td class="text-center">
          <input id="item-{{ item.productId }}" type="checkbox" [checked]="item.isAvailable"
            disabled="disabled" />
        </td>
      </tr>
    </tbody>
  </table>

export class ProductsListComponent implements OnInit {
  itemsPerPage = 7;
  currentPage: number;
  numberOfPages: number;
  isLoading = false;
  queryModel = new PagedQueryModel("productId", true, 1, this.itemsPerPage);
  queryResult = new PagedQueryResult<AppProduct>(0, []);

  constructor(private productsListService: ProductsListService) {}

  ngOnInit() {
    this.getPagedProductsList();
  }

  private getPagedProductsList() {
    this.isLoading = true;
    this.productsListService
      .getPagedProductsList(this.queryModel)
      .subscribe(result => {
        this.queryResult = result;
        this.isLoading = false;
      });
  }
}

  <div align="center">
    <pagination [maxSize]="8" [boundaryLinks]="true" [totalItems]="queryResult.totalItems"
      [rotate]="false" previousText="&lsaquo;" nextText="&rsaquo;" firstText="&laquo;"
      lastText="&raquo;" (numPages)="numberOfPages = $event" [(ngModel)]="currentPage"
      (pageChanged)="onPageChange($event)"></pagination>
  </div>
  <pre class="card card-block card-header">Page: {{currentPage}} / {{numberOfPages}}</pre>

export class ProductsListComponent implements OnInit {
  itemsPerPage = 7;
  currentPage: number;
  numberOfPages: number;

  onPageChange(event: any) {
    this.queryModel.page = event.page;
    this.getPagedProductsList();
  }
}

            .PagesHeader(header =>
            {
                header.CacheHeader(cache: true); // It's a default setting to improve the performance.

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