Upload and Download Files with Web API and Azure Blob Storage Dave Donaldson. Before Amazon S3 existed, if your web application needed to handle the uploading and storing of files, you basically had the following options put them on the web server file system, offload them to a NASSAN device, or shove them into the database. Each method had its own issues, but Amazon S3 came along and said, Screw that, just store all those files in one big bucket in the cloud, and so thats now the norm. Enter Azure Blob Storage on Microsofts Azure platform its rival to Amazon S3. Up until spring of 2. I have a bucket with thousands of files in it. How can I search the bucket Is there a tool you can recommendAzure Blob Storage was roughly 2x the cost of Amazon S3, but now that the pricing between the two platforms are identical, it makes Azure Blob Storage a much more attractive option. So lets say youre using ASP. NET Web API to build a RESTful API for your app, you need endpoints that support uploading and downloading files, and youve decided to use Azure Blob Storage. Great, I have a solution for you. Add Reference to Windows Azure Storage Library. First things first, use the Nuget package manager to reference the Windows Azure Storage library. Blob Storage Config Settings. Second thing you need to do is add the following two config entries as lt app. Settings in your web. Blob. Storage. Connection. String and Blob. Storage. Container. Name Models for Upload and Download. For this solution you need a couple model classes Blob. Upload. Model and Blob. Download. Model that are used to hold certain pieces of data when uploading and downloading files, respectively. Feel free to put these in the Models folder of your Web API project API Routes. With that done, go ahead and add the two routes one for uploading, one for downloading to your Web. Api. Config. cs file, typically located in your AppStart folder Blobs. Download Ableton Live 8 Air Iso. Controller. Next up is the Blobs. Controller with the actions for uploading and downloading files A few things to note about the Blobs. Controller It calls into a Blob. Homer Simpson Doh Sound there. Service that does the actual work. Both action methods use async Task, mainly for better support of handling large files. The Post. Blob. Upload action. Supports uploading multiple files at once. Returns a list of Blob. Upload. Model. Has a check to force allowing only multipart form data meaning, this endpoint only accepts files being posted to it. The Get. Blob. Download action. Amazon S3 File Upload Api C#' title='Amazon S3 File Upload Api C#' />Takes in a unique blob ID in order to retrieve the blob this is an ID stored in your database. Returns Http. Response. Message instead of IHttp. Action. Result. IMPORTANT Resets the position of the blob stream that gets returned from the Blob. Service otherwise, the download wont happen. Amazon DynamoDB is a fully managed proprietary NoSQL database service that is offered by Amazon. Amazon Web Services portfolio. DynamoDB exposes a. Amazon Web Services AWS is a collection of remote computing services, also called web services, that make up a cloud computing platform offered by Amazon. File upload in ASP. NET MVC using Dropzone JS and HTML5, mvc, asp. Venkat Baggu blog, mvc. You must have a Dolby Developer account to access that content. Log in below to continue. Dont have an account Fear not Creating an account is free and easy Dynamsoft Scan Documents Online and Upload as Images Learn Dynamic Web TWAIN scanning SDK with which you can embed online document scanning and uploading easily to. The Startup Checklist. This is a list of everything you need to do to launch a startup. After using it for years to successfully launch a variety of projects, were. If I have existing files on Amazons S3, whats the easiest way to get their md5sum without having to download the files Thanks. Chilkat v9. 5. 0. This is a list of minor fixes made so far. The v9. 5. 0. 69 release notes are available here Chilkat v9. In finance, an exchange rate also known as a foreignexchange rate, forex rate, ER, FX rate or Agio between two currencies is the rate at which one currency will be. Sets the proper response headers for content type, disposition, and length. Blob. Service Interface and Implementation. Below is the IBlob. Service interface and its Blob. Service implementation class There are a few things to call out here The async Task approach continues. The Upload. Blobs method. Supports multiple files at once. Creates an instance of the custom class Blob. Storage. Upload. Provider, which gets passed to the Read. As. Multipart. Async call to perform the actual upload of files. Has a TODO for you to take the data returned from Azure and store it in your own database so that you can retrieve it later through the API properly. You can see an example of this data further down this post. The Download. Blob method. Has a TODO for you to implement a helper method that retrieves the blob info from your database, based on the blob. Id that was passed in. Calls a static Blob. Helper class to get the blob container name. Downloads the file asynchronously from Azure into a memory stream that gets returned as part of the Blob. Download. Model result. Sample Program For Vb. The closing and disposing of this memory stream is handled by the Web API framework. Static Blob. Helper Class. Heres the small Blob. Helper class, which contains a single static method for getting a reference to your blob container. Notice that it reads the Blob. Storage. Connection. String and Blob. Storage. Container. Name lt app. Settings from config that we defined earlier Blob. Storage. Upload. Provider. Now lets look at the Blob. Storage. Upload. Provider, which performs the actual file uploads into Azure Some notes about this class It inherits from Multipart. File. Stream. Provider. It exposes a property named Uploads, which contains the list of files that were uploaded. It uses Path. Get. Temp. Path as the temporary location on disk to store the files before sending them to Azure. Also uses the static Blob. Helper to get the blob container. It overrides Execute. Post. Processing. Async to inject the uploading of the files to Azure, then calls the base to complete the task. Sample JSON Output for Blob Uploads. With all that in place, you can now use those endpoints to upload and download files into Azure Blob Storage. Heres a sample JSON output from the API when uploading two files into Azure Here you can see the data you should store in your own database to maintain a relationship between your application and Azure. The download API endpoint works as youd expect give it the blob. Id from your database and hit it from a browser or tool like Postman or Fiddler youll get prompted to download the requested file. Increase Request Limits. The default request size for ASP. NET is 4. MB, so youll need to increase that limit if you want to allow uploading and downloading of larger files. You can do this by setting the max. Request. Length and max. Allowed. Content. Length values in your web. NOTE the max. Request. Length value is in kilobytes, but the max. Allowed. Content. Length value is in bytes. Heres an example for increasing request limits to 1. MB Sequence Diagrams. It probably seems like theres a lot here, but its actually pretty straight forward when you break it down. To help paint the bigger picture, here are two sequence diagrams that show the parts involved for uploading and downloading files through the API into Azure click each one to open full size image Upload Files to Azure Blob Storage. Download File from Azure Blob Storage. Summary. Ive spent a fair amount of time refining this design and think it will prove useful if you have similar needs. One pleasant surprise was Azures performance uploading and downloading files was much quicker than I expected. Enjoy. Featured Image All rights reserved by Luigi R.