To upload file you can use Model type IFormFile, which is found in the Microsoft.AspNet.Http namespace.
On View
<form method="post" asp-action="Index" asp-controller="Home" enctype="multipart/form-data">
<input type="file" name="files" multiple/>
<input type="submit" value="Upload" />
</form>
On Controller
public class HomeController : Controller
{
private IHostingEnvironment _environment;
public HomeController(IHostingEnvironment environment)
{
_environment = environment;
}
public IActionResult Index()
{
return View();
}
[HttpPost]
public async Task<IActionResult> Index(ICollection<IFormFile> files)
{
var uploads = Path.Combine(_environment.WebRootPath, "uploads");
foreach (var file in files)
{
if (file.Length > 0)
{
using (var fileStream = new FileStream(Path.Combine(uploads, file.FileName), FileMode.Create))
{
await file.CopyToAsync(fileStream);
}
}
}
return View();
}
}
Notes that we receive files using ICollection<IFormFile>
IFormFile objects share some properties, methods like
- Length
- FileName
- Name : returns the value of the name attribute on the upload control.
- CopyToAsync method to save file to HD
To Upload multi-Files with other form info, use Model like this
public class FileDescriptionShort
{
public int Id { get; set; }
public string Description { get; set; }
public string Name { get; set; }
public ICollection<IFormFile> File { get; set; }
}
public async Task<IActionResult> Index(FileDescriptionShort fileDescriptionShort)
{
}
To Upload One File use define it in Model like this
[Required]
[FileExtensions(Extensions = "jpg,jpeg")]
public IFormFile File { get; set; }
For Multi-Files use [Required]
public ICollection<IFormFile> File { get; set; }
To download file from FileTable based on file ID
PM> Install-Package Microsoft.AspNetCore.StaticFiles
public string Get_contentType(string fileName)
{
var provider = new FileExtensionContentTypeProvider();
string contentType;
if (!provider.TryGetContentType(fileName, out contentType))
{
contentType = "application/octet-stream";
}
return contentType;
}
[HttpGet]
public FileStreamResult Download(int id)
{
var path = "c:\\path\\a.pdf"; var stream = new FileStream(path, FileMode.Open);
return File(stream, Get_contentType(path) );
}
How to upload file to amazon s3 through web api
[HttpPost]
public async Task<string> PostAsync([FromBody] string FileName, IFormFile File2Upload)
{
if (File2Upload != null)
{
using (var client = new AmazonS3Client(AWSkey, AwsSecret, RegionEndpoint.USEast2))
{
using (var newMemoryStream = new MemoryStream())
{
File2Upload.CopyTo(newMemoryStream);
var uploadRequest = new TransferUtilityUploadRequest
{
InputStream = newMemoryStream,
Key = FileName, //fileUpload.ProfileImage.FileName.ToString(),
BucketName = S3folderName,
CannedACL = S3CannedACL.PublicRead
};
var fileTransferUtility = new TransferUtility(client);
await fileTransferUtility.UploadAsync(uploadRequest);
}
}
return "https://S3folderName.s3.us-east-2.amazonaws.com/" + FileName;
}
return "";
}
