The instructions in this article are designed for a C# ASP .NET MVC application. They should work elsewhere are with tweaks for your situation. This assumes that your AWS creds are already setup. It's based on a Microsoft article about file uploads with tweaks for the s3 upload.
Add dependency
Add the NuGet module AWSSDK.S3 to your project
Add the data class
Create a file with this content
using Amazon;
using Amazon.S3;
using Amazon.S3.Transfer;
using System;
using System.IO;
using System.Threading.Tasks;
namespace YOUR_NAMESPACE
{
public class S3Upload
{
private static readonly RegionEndpoint bucketRegion = RegionEndpoint.EUWest2;
private static IAmazonS3 s3Client;
public static async Task UploadFileAsync(Stream FileStream, string bucketName, string keyName)
{
s3Client = new AmazonS3Client(bucketRegion);
var fileTransferUtility = new TransferUtility(s3Client);
await fileTransferUtility.UploadAsync(FileStream, bucketName, keyName);
}
}
}
Add a new modal
Add a new modal called FileUploadFormModal.cs to your project with this content
public class FileUploadFormModal
{
[Required]
[Display(Name="File")]
public IFormFile FormFile { get; set; }
}
Add a view
Create a view called FileUploadForm.cshtml with this content in Views/Home
@model FileUploadFormModal
<form enctype="multipart/form-data" method="post">
<dl>
<dt>
<label asp-for="FileUploadFormModal.FormFile"></label>
</dt>
<dd>
<input asp-for="FileUploadFormModal.FormFile" type="file">
</dd>
</dl>
<input asp-page-handler="Upload" class="btn" type="submit" value="Upload">
</form>
Edit HomeController.cs controller
Add a using statement for the data class and add the following code to the HomeController.cs
public async Task<IActionResult> FileUploadForm()
{
return View();
}
[HttpPost]
public async Task<IActionResult> FileUploadForm(FileUploadFormModal FileUpload)
{
using (var memoryStream = new MemoryStream())
{
await FileUpload.FormFile.CopyToAsync(memoryStream);
// Upload the file if less than 2 MB
if (memoryStream.Length < 2097152)
{
await S3Upload.UploadFileAsync(memoryStream, "YOUR_BUCKET_NAME", "YOUR_KEY_NAME");
}
else
{
ModelState.AddModelError("File", "The file is too large.");
}
}
return View();
}
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