asp.net core

Story of File Uploading in ASP.NET Core (Part II - Angular/AJAX)

Uploading files from Angular end to an ASP.NET Core Web API can be done using the same IFormFile interface; introduced in the previous post. To keep things separated, a new API controller (UserController) has been created with the following POST action, [HttpPost] public async Task<IActionResult> PostUser([FromForm]UserVM vm) { if (!ModelState.IsValid) { return BadRequest(ModelState); } /* Use Automapper for mapping UserVM to User */ User user = new User { Name = vm.Name }; using (var memoryStream = new MemoryStream()) { await vm.Avatar.CopyToAsync(memoryStream); user.Avatar = memoryStream.ToArray(); } _context.Users.Add(…

Keep reading

Story of File Uploading in ASP.NET Core (Part I - MVC/Razor Pages)

The built-in IFormFile interface can be used to represent a file sent via some http request on the ASP.NET Core server side. Following is the skeleton of IFormFile: public interface IFormFile { // Gets the raw Content-Type header of the uploaded file. string ContentType { get; } // Gets the raw Content-Disposition header of the uploaded file. string ContentDisposition { get; } // Gets the header dictionary of the uploaded file. IHeaderDictionary Headers { get; } // Gets the file length in bytes. long Length { get; } // Gets the name from the Content-Disposition header. string Name { get; } // Gets the file name…

Keep reading

How Tree Shaking Works in ASP.NET Core Angular SPA

If you've been using ES2015 modules throughout your javascript codebase; in other words: import(ing) and export(ing) modules, there is a good news for you. You can eliminate unused modules (dead code) from your published script when using different module bundlers available online. And this process of dead code elimination is known as so called Tree Shaking. While rollup (a trending module bundler) being the first to introduce the concept and implement it, other module bundlers came to realize that this is a must have feature and soon they…

Keep reading

Faking with In Memory Database In ASP.NET Core 2.0

Alright, I messed up between the terms: faking and mocking when one of my friend asked me "How are you faking in .net core?". I told him with my little to no knowledge about faking that, "Use the Moq library". But later found that I was totally wrong. And mocking is not actually faking. Then I read a lot of articles/blogs on those topics and came across with this beautiful blog post by Martin Fowler on Mocks Aren't Stubs. Take your time and read it to get your facts…

Keep reading

Lazy-loading NgModules in ASP.NET Core AngularSPA

Angular has this cool feature of loading a module lazily. Modules that are set up to load lazily can significantly save application startup time. Lazy-load module set up is done in application's routing configuration section. As the title suggests we will be using the AngularSPA template shipped with Visual Studio 2017 Preview (2) for demonstration. Route that is configured to lazy-load a module sends an HTTP GET to the server which in turns return the module in a chunk of code block. This only happens when the router is activated…

Keep reading

Cache headers for MVC File Action Result (ASP.NET Core 2.0)

You typically work with one of the following action results when you want to write a file to the response. FileContentResult (writes a binary file to response) FileStreamResult (writes a file from a stream to the response) VirtualFileResult (writes a file specified using a virtual path to the response) These are all coming from ASP.NET Core's MVC package. In earlier version of ASP.NET Core (1.*); using these action results, you could have served files but there wasn't any way of configuring cache headers for the responses. I'm pretty…

Keep reading

Entity Framework Core Triggers in Action (Unofficial Package)

Recently I have had this problem of updating a field of an entity that is dependent on another field of another entity. Confused already? Let me give you an example: so, I've these Inventory and Item entities where there exists a many-to-many relation between them. So, of course there should also be a relation table between them i.e. InventoryItem. The problem I was having actually is I have had this one field called CurrentQuantity on the Item entity and other called IssuedQuantity on the relation table (InventoryItem). Thus, as…

Keep reading

ASP.NET Core API Versioning in Simple Words (Update 1.2.0)

Few days ago, me and my friends developed an API using ASP.NET Core where from the GET method we returned some data to our client app. We did pagination in the front end. Means that first we sent all the data to the client and then did some data.length operation on that to get the items count for applying pagination logic. Then decided that we should do the logic in the back-end (server-side pagination) because it will decrease the payload of the HTTP request. In our case it…

Keep reading

Terms we don't fully understand while learning ASP.NET core

There are some terms, developers like me often ignore while learning ASP.NET Core. Because at the end of the day it's all about making apps not learning stuff. But having a basic understanding over the core concepts can make you a lot better developer than you already are. So, this article will clear the concepts of some of those ignored and misunderstood terms in details. This article is upgradable with new topics. So, if you have other topics such as below and want it here, please make a comment…

Keep reading

Adding Angular Material in ASP.NET Core Angular SPA template (Update 2.0.0)

If you are not familiar with ASP.NET Core SpaServices, take a look at this repository: https://github.com/aspnet/JavaScriptServices/tree/dev/src/Microsoft.AspNetCore.SpaServices Lots of SPA templates (Angular, React, Vue, Aurelia etc.) are available in this repo that uses NodeServices for server side rendering. We will work with the AngularSpa template and add Angular Material in it. To install the Spa templates via yeoman, first intall the template generator with the following command: npm install -g generator-aspnetcore-spa@next Create a directory where you will initialize the…

Keep reading