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Intro I had written Angular app and ASP.NET Core app separately. But because I had had to use some internal api at my work, I tried to integrate them. Prepare Angular (CLI ver. 8.3.21) ASP.NET Core (ver. 3.1.101) Because Microsoft.AspNetCore.SpaServices of ASP.NET Core had been obsoleted and changed to Microsoft.AspNetCore.SpaServices.Extensions. So there hadn't been so much documents. [Announcement] Obsoleting Microsoft.AspNetCore.SpaServices and Microsoft.AspNetCore.NodeServices #12890 Thus, I had generated sample program of Angular template. And I had followed it to integrate apps. dotnet new angular -n AngularSample Change Angular app Because of Microsoft.AspNetCore.SpaServices.Extensions, I hadn't needed changing the Angular app. Output Path The output path hadn't been same as Angular template's one. angular.json (Angular CLI) ... "outputPath": "dist/{PROJECT-NAME}", ... angular.json (ASP.NET Core) ... "outputPath&quo

Intro When I had POST data from the Angular app to ASP.NET Core app, sometimes I failed even though there hadn't been any exceptions happened. Because I had wanted to know the reason, I tried something. What I did Set data to Request Payload and POST Set data to Form Data and POST Get data from ASP.NET Core Sample Codes ASP.NET Core ApiController.cs using System; using System.Collections.Generic; using System.Threading.Tasks; using Files; using Microsoft.AspNetCore.Identity; using Microsoft.AspNetCore.Mvc; using Models; using UpgradeSample.Models; using UpgradeSample.Products; namespace UpgradeSample.Controllers { public class ApiController: Controller { private readonly IProductService _productService; public ApiController(IProductService productService) { _productService = productService; } [HttpGet] [Route("/products")] public async Task<List<Product>> GetProducts() {

Intro When I tried sending file data on last time, I had confused with "promise.then", "async/await" and "Observable". [Angular][ASP.NET Core] Upload chunked files So I wanted to distinct them, and this time, I tried to use "Observable" because HttpClient return Observable<any>. Call observables in order I sended file in these steps. Read file by FileReader Create directory for saving chunks send and saving chunks merge chunks to one file and delete chunks Each steps used the former steps result. So I could write by Promise.then like below. this.executeStep1() // return Promise<UploadResult> .then(result => this.executeStep2(result)) // return Promise<UploadResult> .then(result => this.executeStep3(result)) // return Promise<UploadResult> .catch(reason => console.log(reason)); Result I could write with pipe & flatMap. file-uploader.service.ts public upload(file: File): Observable<U

Intro I wanted to send spreadsheets(.xlsx) to sever. But before sending, I wanted to validate the files. So I tried to read them with SheetJS. GitHub - SheetJS/sheetjs: SheetJS Community Edition -- Spreadsheet Data Toolkit xlsx · docs Spreadsheet sample Install & read data Install npm install --save xlsx Open workbook and worksheet For opening workbook, I used FileReader by Reading XLSX from FileReader.readAsArrayBuffer() · SheetJS/sheetjs Wiki · GitHub . sheet-loader.service.ts import { Injectable } from '@angular/core'; import * as xlsx from 'xlsx'; @Injectable({ providedIn: 'root' }) export class SheetLoaderService { constructor() { } public load(file: File) { const reader: FileReader = new FileReader(); reader.onload = (e: any) => { /* read workbook */ const loadResult: string = e.target.result; const workbook: xlsx.WorkBook = xlsx.read(loadResult, {type: 'binary'}); /* set first sheet as target