Upload(Pathstring: String
In this blog postal service I desire to show how to upload files from an Angular awarding over an ASP.NET Core WebAPI to an Azure Hulk Storage and save them there. Using an Azure Blob Storage for this is a perfect candidate not to pollute your App Service and store files in that location simply utilize a defended organization for this. In this blog mail service we volition see how we can create the Azure Hulk Storage in the Azure Portal, add together the appropriate services into an ASP.Cyberspace Core WebAPI and add an Athwart Client to upload the files.
GitHub Repository
TOC
- Create the Azure Blob Storage
- The ASP.Net Cadre WebAPI
- Installing the NuGet parcel
- Modifying the app settings
- Registering the service
- Creating a blob service
- Using the service in a controller
- Creating the Angular App
- The UploadService
- The Uploading Component
Create the Azure Blob Storage
Create the blob storage by entering your dashboard and select "Create Storage Account"
You tin can give it a proper noun
then leave all the default values and click until "Review and Create" and then Create your Azure Storage Account.
When the Azure Storage Account is created you can go to the resource and hit the "Container" Button.
We create a new container, set information technology to "Public access level" "Blob" and give information technology a name. firstcontainer in this example.
Then click "Create".
Inside of the container you tin can come across no files yet, we will upload them with Angular and ASP.Internet Cadre. Read on 😉
If y'all become dorsum into the Container Overview you tin can choose the "Access keys" in the menu on the left and then copy the commencement Connectedness string mentioned at that place.
We need this for later.
And that is it for setting upwardly the Azure Blob Storage.
Let us move on and create the ASP.Net Core WebAPI.
The ASP.Internet Core WebAPI
Installing the NuGet parcel
To upload files to the blob storage we will create a few services within of the API which will communicate with our Azure Hulk Storage. Earlier nosotros do this we need to add together a NuGet parcel:
NuGet Azure Storage Blobs Package
You can check if and which version o the package is installed by checking your *.csproj file to discover an entry similar this:
<Project Sdk= "Microsoft.Cyberspace.Sdk" > // ... <ItemGroup> <PackageReference Include= "Azure.Storage.Blobs" Version= "<VERSION_HERE>" /> // ... </ItemGroup> // ... </Projection> Modifying the app settings
Now let us enter the appsettings.json file to add an entry called AzureBlobStorage and paste the connectedness cord you copied here
{ // ... "AzureBlobStorage": "<SUPER_SECRET_CONNECTION_STRING>" } Registering the service
In the Startup.cs file nosotros can now register a BlobServiceClient into our services container using the namespace Azure.Storage.Blobs and pass it the previously added value from the configuration.
using Azure.Storage.Blobs; public void ConfigureServices(IServiceCollection services) { // ... services.AddScoped(x => new BlobServiceClient(Configuration.GetValue<string>("AzureBlobStorage"))); // ... } Creating a blob service
Having done that nosotros can inject the BlobServiceClient into a service BlobService we create adjacent.
public form BlobService : IBlobService { individual readonly BlobServiceClient _blobServiceClient; public BlobService(BlobServiceClient blobServiceClient) { _blobServiceClient = blobServiceClient; } public async Job<Uri> UploadFileBlobAsync(string blobContainerName, Stream content, cord contentType, string fileName) { var containerClient = GetContainerClient(blobContainerName); var blobClient = containerClient.GetBlobClient(fileName); await blobClient.UploadAsync(content, new BlobHttpHeaders { ContentType = contentType }); return blobClient.Uri; } private BlobContainerClient GetContainerClient(string blobContainerName) { var containerClient = _blobServiceClient.GetBlobContainerClient(blobContainerName); containerClient.CreateIfNotExists(PublicAccessType.Hulk); return containerClient; } } The method UploadFileBlobAsync uploads a file to the blob storage we created using the BlobServiceClient. Get-go, nosotros get the container client and phone call CreateIfNotExists on it.
This will ensure the container is there when we upload something into information technology. Withal if you practise not want to allow your API decide which containers to exist created or practice this when seeding or not in the api at all you have to remove or motility this line to some other place. 😊
When returned the containerClient we create a blobClient and upload information technology setting the content type and returning the Uri object here.
Annals the service with its interface in the Startup.cs as following
services.AddScoped<IBlobService, BlobService>(); Using the service in a controller
Inside our controller we tin now inject the service and telephone call the method to upload the file size. Nosotros are reacting to a Mail request and reading the file from the Request object and render a JSON with a belongings path containing the accented path to the resource we uploaded.
Note that nosotros are using the DisableRequestSizeLimit hither for demo. Maybe you want to remove this in production apps. Equally a blobContainerName param nosotros are passing the proper noun of the container we want to shop our data in. We created this before when calculation the storage in Azure but with our code a new i will exist created also automatically for us.
using ... namespace backend.Controllers { [ApiController] [Route("api/[controller] ")] public class UploadController : ControllerBase { private IBlobService _blobService; public UploadController(IBlobService blobService) { _blobService = blobService; } [HttpPost(""), DisableRequestSizeLimit] public async Task<ActionResult> UploadProfilePicture() { IFormFile file = Request.Form.Files[0]; if (file == zero) { return BadRequest(); } var outcome = await _blobService.UploadFileBlobAsync( "firstcontainer", file.OpenReadStream(), file.ContentType, file.FileName); var toReturn = effect.AbsoluteUri; return Ok(new { path = toReturn }); } } } Our upload url will be <domain>/api/upload so.
That is it for the backend, we have to add the frontend now and create an Athwart app which will upload the files for us.
Creating the Angular App
The Angular app is pretty straight forward. Commencement let us create an UploadService which communicates to the backend.
The UploadService
import { HttpClient } from '@angular/common/http'; import { Injectable } from '@athwart/core'; @Injectable({ providedIn : 'root' }) export class UploadService { constructor(private http: HttpClient) {} upload(formData: FormData) { return this.http.post <{ path: cord }>( 'https://localhost:5001/api/upload', formData ); } } In the app.module.ts the HttpClientModule has to exist added to the imports as well.
import { HttpClientModule } from '@angular/mutual/http'; import { NgModule } from '@angular/core'; import { BrowserModule } from '@athwart/platform-browser'; import { AppComponent } from './app.component'; @NgModule({ imports : [BrowserModule, HttpClientModule], declarations : [AppComponent], bootstrap : [AppComponent], }) export class AppModule {} The Uploading Component
In the components template we use a push button to open a subconscious file input and nosotros are setting the filename of the selected file and then the user knows that a file was created. A relieve button then calls a save() method where the files are getting passed and kicks of the saving progress
<push type = "button" ( click )=" fileInput . click ()">Choose File</button> <input subconscious # fileInput blazon = "file" id = "file" ( change )=" setFilename ( fileInput . files )" /> <label>{{ filename }}</characterization> <br /> <button type = "button" ( click )=" relieve ( fileInput . files )">Relieve</button> <br /> <img [ src ]=" imageSource " /> The component class gets injected the UploadService and calls the upload method passing the form data. When the call comes back we are extracting the path belongings and setting it as epitome source to display the picture we uploaded.
import { Component } from '@angular/core'; import { UploadService } from './upload.service'; @Component({ selector : 'app-root', templateUrl : './app.component.html', styleUrls : ['./app.component.css'], }) export class AppComponent { filename = ''; imageSource = ''; constructor(private uploadService: UploadService) {} setFilename(files) { if (files[0]) { this.filename = files[0].name; } } salve(files) { const formData = new FormData(); if (files[0]) { formData.append(files[0].name, files[0]); } this.uploadService .upload(formData) .subscribe(({ path }) => (this.imageSource = path)); } } 
And we can see the file in the hulk container.
GitHub Repository
And that is it, hope it helps!
Fabian
Other blogposts
- tap, map & switchMap explained
- Implement endless scroll with Angular, NgRx and ASP.Internet Core WebAPI
- WebHooks with ASP.NET on Azure - DropBox and GitHub
- Getting started with Visual Studio Code, AngularJS and Typescript
- Working with Angular Template Forms
murillowastumpaboos.blogspot.com
Source: https://offering.solutions/blog/articles/2020/08/09/uploading-files-to-azure-blob-storage-with-angular-and-asp.net-core/
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