C# web api file upload and download

The procedure for creating the application is as in the following. Step 1 First we create a database in SQL. Open SQL Server Select "New Query" and create the database and table. The following commands are used for creating the database and table:.

Next Recommended Reading. In order to download a file, we make an HTTP Get request, then read the response content into a memory stream which can be copied to a physical file. If you are interested, you might want to read my other articles: File Upload via Swagger , Upload Files with Angular and. Again, the full solution for this article is in my GitHub repository. I hope you have learned something new. Thanks for reading. Senior Application Developer.

I write blogs about. Bursts of code to power through your day. In the end line 7 , we return a FileContentResult object that is created using the method File byte[] fileContents, string contentType, string fileDownloadName. Note that we should validate the request and user permissions before finding or generating the requested file.

And you can choose to stream the file too. In the File method line 7 , the second parameter contentType is used in the HTTP header to indicate the format of contents transmitted over the internet.

You can set the value for contentType according to your file type. In the File method, the third parameter fileDownloadName determines the value for the filename attribute in the content-disposition HTTP response header.

Browsers treat this value as the top priority to dictate the filename when downloading the file. In the responses section, the Swagger UI provides a link for downloading the returned file. Sometimes, the file type should be determined at runtime. Then in this case, we should set the contentType based on the file extension. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.

Privacy policy. This tutorial shows how to upload files to a web API. It also describes how to process multipart MIME data. Download the completed project. This form contains a text input control and a file input control. The format of a multipart MIME message is easiest to understand by looking at an example request:.

Logging; using Microsoft. Models; using System; using System. Tasks; using UploadandDownloadFiles. Use this method to add services to the container. AddControllers ; services. Use this method to configure the HTTP request pipeline. UseDeveloperExceptionPage ; app. UseSwagger ; app. UseHttpsRedirection ; app. UseRouting ; app. UseAuthorization ; app.

Http; using Microsoft.