In my mobile app using Xamarin.Android, I implemented file attachment feature. In that, I got file content in Android.Net.Uri from
protected override async void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
Android.Net.Uri attachmentUri = data.Data;
}
Now, in order to upload the file as multipart message, I have to convert this uri to byte array. I searched a lot but everything in Java. I need such code in C#.
You can use the ContentResolver.OpenInputStream on the Android.Net.Uri to retrieve a stream that you can then use StreamContent to convert it to a ByteArrayContent object and apply that to your MultipartFormDataContent.
using (var resolverStream = ContentResolver.OpenInputStream(data.Data))
using (var streamContent = new StreamContent(resolverStream))
using (var byteArrayContent = new ByteArrayContent(await streamContent.ReadAsByteArrayAsync()))
using (var formDataContent = new MultipartFormDataContent())
{
formDataContent.Add(byteArrayContent, "file", "DummyFileName");
// rest of the header setup, PostAsync, etc..
}
.Add(...) for each of your "files" (ByteArrayContent).You can use this for your multipart message:
var dat = data.Data;
ByteArrayOutputStream outputstream = new ByteArrayOutputStream();
FileInputStream filestream;
try
{
filestream = new FileInputStream(new File(dat.Path));
byte[] buffer = new byte[1024];
int n = filestream.Read(buffer);
while (-1 != n)
{
outputstream.Write(buffer, 0, n);
}
}
catch(IOException e)
{
e.PrintStackTrace();
}
byte[] filebyte = outputstream.ToByteArray();
content: based uri, otherwise you would need to use the ContentResolver.