In this article, we will see how to upload a file into the database using the Angular 7 app in an ASP.NET project. Let us create a new project in Visual Studio 2017. We are using ASP.NET Core 2 and Angular 7 for this project.

Prerequisites:

  • Node JS must be installed
  • Angular CLI must be installed
  • Basic knowledge of Angular

Let’s get started.

Create a new project and name it as FileUploadInAngular7

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Select a new project with Angular in .NET Core and uncheck the configure HTTPS

file-upload-in-angular-7-with-asp-net-core-web-api-3

Your project will be created. Left click on ClientApp and open it in file explorer

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Type cmd as shown in the picture.

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Type npm install in the cmd

Now it will take time and all the node_modules will be installed in the project.

Create a Web API controller as UploadController.

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Add the following code in it.

using System.IO;
using System.Net.Http.Headers;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;

namespace FileUploadInAngular7.Controllers
{
    [Produces("application/json")]
    [Route("api/[controller]")]
    public class UploadController : Controller
    {
        private IHostingEnvironment _hostingEnvironment;

        public UploadController(IHostingEnvironment hostingEnvironment)
        {
            _hostingEnvironment = hostingEnvironment;
        }

        [HttpPost, DisableRequestSizeLimit]
        public ActionResult UploadFile()
        {
            try
            {
                var file = Request.Form.Files[0];
                string folderName = "Upload";
                string webRootPath = _hostingEnvironment.WebRootPath;
                string newPath = Path.Combine(webRootPath, folderName);
                if (!Directory.Exists(newPath))
                {
                    Directory.CreateDirectory(newPath);
                }
                if (file.Length > 0)
                {
                    string fileName = ContentDispositionHeaderValue.Parse(file.ContentDisposition).FileName.Trim('"');
                    string fullPath = Path.Combine(newPath, fileName);
                    using (var stream = new FileStream(fullPath, FileMode.Create))
                    {
                        file.CopyTo(stream);
                    }
                }
                return Json("Upload Successful.");
            }
            catch (System.Exception ex)
            {
                return Json("Upload Failed: " + ex.Message);
            }
        }

    }
}

Navigate to the following path and open both the files.

In home.component.html write the following code.

<h1>File Upload Using Angular 7 and ASP.NET Core Web API</h1>
<input #file type="file" multiple (change)="upload(file.files)" />
<br />
<span style="font-weight:bold;color:green;" *ngIf="progress > 0 && progress < 100">
  {{progress}}%
</span>

<span style="font-weight:bold;color:green;" *ngIf="message">
  {{message}}
</span>

In home.component.ts file write the following code in it.

import { Component, OnInit } from '@angular/core';
import { HttpClient, HttpRequest, HttpEventType, HttpResponse } from '@angular/common/http';

@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
})
export class HomeComponent {
  public progress: number;
  public message: string;
  constructor(private http: HttpClient) { }

  upload(files) {
    if (files.length === 0)
      return;

    const formData = new FormData();

    for (let file of files)
      formData.append(file.name, file);

    const uploadReq = new HttpRequest('POST', `api/upload`, formData, {
      reportProgress: true,
    });

    this.http.request(uploadReq).subscribe(event => {
      if (event.type === HttpEventType.UploadProgress)
        this.progress = Math.round(100 * event.loaded / event.total);
      else if (event.type === HttpEventType.Response)
        this.message = event.body.toString();
    });
  }
}

Run the project and you will see the following output.

output

You can download the source code from here