In my ASP.NET Core backend, I have a controller function that looks like this:
[HttpPost]
[Route("documents/upload")]
public async Task<IActionResult> UploadFile(ICollection<IFormFile> files)
{
...
}
In my front-end, I call the function like this:
var postSettings = {
method: 'POST',
credentials: 'include',
mode: 'cors'
}
uploadDocuments( files ) {
var data = new FormData();
data.append('files', files);
postSettings.body = data;
return fetch(endPoint + '/documents/upload', postSettings);
}
If "files" is a single file - not an array with one file, but a single File object - UploadFile
is called with an ICollection<IFormFile>
containing the single file.
If "files" is a list of files, either a FileList or an array of File objects, UploadFile
is called with an empty ICollection<IFormFile>
.
How do I submit a list of files in such a way that they can be parsed as an ICollection<IFormFile>
?
Upload Single FileTo add view, right click on action method and click on add view. Then select View from left side filter and select Razor View – Empty. Then click on Add button. Create design for your view as per your requirements.
Uploading Multiple files in ASP.NET Core MVC To Upload multiple files, navigate to " HomeController. cs " and now in the arguments we will take multiple files using "List<IFormFile>" and we will loop through each file to save it on physical drive.
Reference Uploading multiple files at once - with Fetch
uploadDocuments(endPoint, files) {
var postSettings = {
method: 'POST',
credentials: 'include',
mode: 'cors'
};
var data = new FormData();
if(files.length > 0) {
for(var x = 0; x < files.length; x++) {
// the name has to be 'files' so that .NET could properly bind it
data.append('files', files.item(x));
}
}
postSettings.body = data;
return fetch(endPoint + '/documents/upload', postSettings);
}
Reference Uploading small files with model binding
When uploading files using model binding and the
IFormFile
interface, the action method can accept either a singleIFormFile
or anIEnumerable<IFormFile>
(orList<IFormFile>
) representing several files. The following example loops through one or more uploaded files, saves them to the local file system, and returns the total number and size of files uploaded.
[HttpPost]
[Route("documents/upload")]
public async Task<IActionResult> Post(List<IFormFile> files)
{
long size = files.Sum(f => f.Length);
// full path to file in temp location
var filePath = Path.GetTempFileName();
foreach (var formFile in files)
{
if (formFile.Length > 0)
{
using (var stream = new FileStream(filePath, FileMode.Create))
{
await formFile.CopyToAsync(stream);
}
}
}
// process uploaded files
// Don't rely on or trust the FileName property without validation.
return Ok(new { count = files.Count, size, filePath});
}
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