CRUD Operations

import { NgModule, Component, enableProdMode, ChangeDetectionStrategy, } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { HttpClient, HttpClientModule, HttpHeaders, HttpParams, } from '@angular/common/http'; import { DxDataGridModule, DxSelectBoxModule, DxButtonModule } from 'devextreme-angular'; import CustomStore from 'devextreme/data/custom_store'; import { formatDate } from 'devextreme/localization'; import { lastValueFrom } from 'rxjs'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } const URL = 'https://js.devexpress.com/Demos/Mvc/api/DataGridWebApi'; @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'], preserveWhitespaces: true, }) export class AppComponent { dataSource: any; customersData: any; shippersData: any; refreshModes: string[]; refreshMode: string; requests: string[] = []; constructor(private http: HttpClient) { this.refreshMode = 'reshape'; this.refreshModes = ['full', 'reshape', 'repaint']; this.dataSource = new CustomStore({ key: 'OrderID', load: () => this.sendRequest(`${URL}/Orders`), insert: (values) => this.sendRequest(`${URL}/InsertOrder`, 'POST', { values: JSON.stringify(values), }), update: (key, values) => this.sendRequest(`${URL}/UpdateOrder`, 'PUT', { key, values: JSON.stringify(values), }), remove: (key) => this.sendRequest(`${URL}/DeleteOrder`, 'DELETE', { key, }), }); this.customersData = { paginate: true, store: new CustomStore({ key: 'Value', loadMode: 'raw', load: () => this.sendRequest(`${URL}/CustomersLookup`), }), }; this.shippersData = new CustomStore({ key: 'Value', loadMode: 'raw', load: () => this.sendRequest(`${URL}/ShippersLookup`), }); } sendRequest(url: string, method = 'GET', data: any = {}): any { this.logRequest(method, url, data); const httpParams = new HttpParams({ fromObject: data }); const httpOptions = { withCredentials: true, body: httpParams }; let result; switch (method) { case 'GET': result = this.http.get(url, httpOptions); break; case 'PUT': result = this.http.put(url, httpParams, httpOptions); break; case 'POST': result = this.http.post(url, httpParams, httpOptions); break; case 'DELETE': result = this.http.delete(url, httpOptions); break; } return lastValueFrom(result) .then((data: any) => (method === 'GET' ? data.data : data)) .catch((e) => { throw e && e.error && e.error.Message; }); } logRequest(method: string, url: string, data: object): void { const args = Object.keys(data || {}).map((key) => `${key}=${data[key]}`).join(' '); const time = formatDate(new Date(), 'HH:mm:ss'); this.requests.unshift([time, method, url.slice(URL.length), args].join(' ')); } clearRequests() { this.requests = []; } } @NgModule({ imports: [ BrowserModule, DxDataGridModule, DxSelectBoxModule, DxButtonModule, HttpClientModule, ], declarations: [AppComponent], bootstrap: [AppComponent], }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);

::ng-deep #grid { height: 440px; } ::ng-deep .options { padding: 20px; margin-top: 20px; background-color: rgba(191, 191, 191, 0.15); } ::ng-deep .caption { margin-bottom: 10px; font-weight: 500; font-size: 18px; } ::ng-deep .option { margin-bottom: 10px; } ::ng-deep .option > span { position: relative; top: 2px; margin-right: 10px; } ::ng-deep .option > .dx-widget { display: inline-block; vertical-align: middle; } ::ng-deep #requests .caption { float: left; padding-top: 7px; } ::ng-deep #requests > div { padding-bottom: 5px; } ::ng-deep #requests > div::after { content: ""; display: table; clear: both; } ::ng-deep #requests #clear { float: right; } ::ng-deep #requests ul { list-style: none; max-height: 100px; overflow: auto; margin: 0; } ::ng-deep #requests ul li { padding: 7px 0; border-bottom: 1px solid #ddd; } ::ng-deep #requests ul li:last-child { border-bottom: none; }

// In real applications, you should not transpile code in the browser. // You can see how to create your own application with Angular and DevExtreme here: // https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/ window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, }, meta: { 'typescript': { 'exports': 'ts', }, 'devextreme/localization.js': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', }, map: { 'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js', 'typescript': 'npm:typescript@4.2.4/lib/typescript.js', '@angular/core': 'npm:@angular/core@12.2.16', '@angular/platform-browser': 'npm:@angular/platform-browser@12.2.16', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.16', '@angular/forms': 'npm:@angular/forms@12.2.16', '@angular/common': 'npm:@angular/common@12.2.16', '@angular/compiler': 'npm:@angular/compiler@12.2.16', 'tslib': 'npm:tslib@2.3.1/tslib.js', 'rxjs': 'npm:rxjs@7.5.3/dist/bundles/rxjs.umd.js', 'rxjs/operators': 'npm:rxjs@7.5.3/dist/cjs/operators/index.js', 'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@22.2.3/cjs', 'devextreme/bundles/dx.all': 'npm:devextreme@22.2.3/bundles/dx.all.js', 'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.5.20/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.1.65', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.37', 'devextreme-angular': 'npm:devextreme-angular@22.2.3', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.11', 'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat@7.4.11/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode@7.4.11/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class@7.4.11/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras@7.4.11/dist/inferno-extras.min.js', // Prettier 'prettier/standalone': 'npm:prettier@2.7.1/standalone.js', 'prettier/parser-html': 'npm:prettier@2.7.1/parser-html.js', }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts', }, 'devextreme': { defaultExtension: 'js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, 'rxjs': { defaultExtension: 'js', }, 'rxjs/operators': { defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@3.0.11/inferno/package.json', 'npm:@angular/*/package.json', 'npm:@angular/common@12.2.16/*/package.json', 'npm:rxjs@7.5.3/package.json', 'npm:rxjs@7.5.3/operators/package.json', 'npm:devextreme-angular@22.2.3/*/package.json', 'npm:devextreme-angular@22.2.3/ui/*/package.json', 'npm:devextreme-angular@22.2.3/package.json', 'npm:devexpress-diagram@2.1.65/package.json', 'npm:devexpress-gantt@4.1.37/package.json', ], }; System.config(window.config);

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.2.3/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.12.0/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.13/Reflect.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script src="config.js"></script> <script> System.import("app").catch(console.error.bind(console)); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> </body> </html>

using DevExtreme.AspNet.Data; using DevExtreme.AspNet.Mvc; using Newtonsoft.Json; using System; using System.Linq; using System.Net; using System.Net.Http; using System.Net.Http.Formatting; using System.Web.Http; using DevExtreme.MVC.Demos.Models.Northwind; using DevExtreme.MVC.Demos.Models.DataGrid; using System.Collections.Generic; namespace DevExtreme.MVC.Demos.Controllers { [Route("api/DataGridWebApi/{action}", Name = "DataGridWebApi")] public class DataGridWebApiController : ApiController { InMemoryNorthwindContext _nwind = new InMemoryNorthwindContext(); [HttpGet] public HttpResponseMessage Orders(DataSourceLoadOptions loadOptions) { return Request.CreateResponse(DataSourceLoader.Load(_nwind.Orders, loadOptions)); } [HttpPost] public HttpResponseMessage InsertOrder(FormDataCollection form) { var values = form.Get("values"); var newOrder = new Order(); JsonConvert.PopulateObject(values, newOrder); Validate(newOrder); if(!ModelState.IsValid) return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState.GetFullErrorMessage()); _nwind.Orders.Add(newOrder); _nwind.SaveChanges(); return Request.CreateResponse(HttpStatusCode.Created, newOrder); } [HttpPut] public HttpResponseMessage UpdateOrder(FormDataCollection form) { var key = Convert.ToInt32(form.Get("key")); var values = form.Get("values"); var order = _nwind.Orders.First(o => o.OrderID == key); JsonConvert.PopulateObject(values, order); Validate(order); if(!ModelState.IsValid) return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState.GetFullErrorMessage()); _nwind.SaveChanges(); return Request.CreateResponse(HttpStatusCode.OK, order); } [HttpDelete] public void DeleteOrder(FormDataCollection form) { var key = Convert.ToInt32(form.Get("key")); var order = _nwind.Orders.First(o => o.OrderID == key); _nwind.Orders.Remove(order); _nwind.SaveChanges(); } // additional actions [HttpGet] public HttpResponseMessage OrderDetails(int orderID, DataSourceLoadOptions loadOptions) { return Request.CreateResponse(DataSourceLoader.Load( from i in _nwind.Order_Details where i.OrderID == orderID select new { Product = i.Product.ProductName, Price = i.UnitPrice, i.Quantity, Sum = i.UnitPrice * i.Quantity }, loadOptions )); } [HttpGet] public HttpResponseMessage ShippersLookup(DataSourceLoadOptions loadOptions) { var lookup = from i in _nwind.Shippers orderby i.CompanyName select new { Value = i.ShipperID, Text = i.CompanyName }; return Request.CreateResponse(DataSourceLoader.Load(lookup, loadOptions)); } [HttpGet] public HttpResponseMessage CustomersLookup(DataSourceLoadOptions loadOptions) { var lookup = from i in _nwind.Customers let text = i.CompanyName + " (" + i.Country + ")" orderby i.CompanyName select new { Value = i.CustomerID, Text = text }; return Request.CreateResponse(DataSourceLoader.Load(lookup, loadOptions)); } [HttpPost] public HttpResponseMessage Batch(List<DataChange> changes) { foreach(var change in changes) { Order order; if(change.Type == "update" || change.Type == "remove") { var key = Convert.ToInt32(change.Key); order = _nwind.Orders.First(o => o.OrderID == key); } else { order = new Order(); } if(change.Type == "insert" || change.Type == "update") { JsonConvert.PopulateObject(change.Data.ToString(), order); Validate(order); if(!ModelState.IsValid) return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState.GetFullErrorMessage()); if(change.Type == "insert") { _nwind.Orders.Add(order); } change.Data = order; } else if(change.Type == "remove") { _nwind.Orders.Remove(order); } } _nwind.SaveChanges(); return Request.CreateResponse(HttpStatusCode.OK, changes); } } }

using System; using System.Collections.Generic; using System.Data.Entity; namespace DevExtreme.MVC.Demos.Models.Northwind { public class InMemoryNorthwindContext : InMemoryDataContext<Order> { readonly NorthwindContext _nwind = new NorthwindContext(); public DbSet<Customer> Customers => _nwind.Customers; public DbSet<Order_Detail> Order_Details => _nwind.Order_Details; public ICollection<Order> Orders => ItemsInternal; public DbSet<Shipper> Shippers => _nwind.Shippers; protected override IEnumerable<Order> Source => _nwind.Orders; protected override int GetKey(Order item) => item.OrderID; protected override void SetKey(Order item, int key) => item.OrderID = key; } }