Xamarin.forms 图像休息 api

Question

In Xamarin.Forms I am sending my Image to rest Api, while in the Add the image is not being converted as needed, getting and error cannot convert system.net.http.streamcontent to byte[]

HttpClient client = new HttpClient();
MultipartFormDataContent form = new MultipartFormDataContent();
form.Add(new ByteArrayContent(new StreamContent(new MemoryStream(image1)), "bilddatei", "upload.jpg"));

In the code mentioned image1 is an image taken from camera using Xamarin.Forms, please help me resolve this, or let me know of alternate options to send image to Rest web service.

Answer 1

Looks like you need to pass a byte[] instead of a StreamContent . Try this:

var client = new HttpClient();
var form = new MultipartFormDataContent();
form.Add(new ByteArrayContent(new MemoryStream(image1).ToArray()), "bilddatei", "upload.jpg");

Update : If you're saving the picture on device's storage, you can send it like:

var client = new HttpClient();
var form = new MultipartFormDataContent();
var path = "path/to/file";
form.Add(new ByteArrayContent(File.ReadAllBytes(path)), "bilddatei", "upload.jpg");

Answer 2

I understood the doubt, but I believe there is a better way to do this. Using Firebase storage and writing to your database, only the image URL saved in Firebase.

Like this:

>

using (var ms = new MemoryStream(file.ByteFile))
{
    ms.Seek(0, SeekOrigin.Begin);

    var task = new FirebaseStorage(
        "your.adress.firebase.com",
         new FirebaseStorageOptions()
         {
             HttpClientTimeout = new TimeSpan(0, 30, 0)
         })
         .Child("Files")
         .Child($"{file.id}.mp4")
         .PutAsync(ms);

         file.LinkVideo = await task;
         Entity entity = new Entity()
         {
             Name = file.Name,
             LinkVideo = file.LinkVideo,
         };
         //Your API
         return await PostEntity(contest);
}