How to Upload Image Via WebApi

Question

How I can upload Image File via ASP.NET Web API?
I have an input tag in File mode and it posted to API, how I can save it to server folder?
I tried th

Answer 1

Set this code (taken from http://www.c-sharpcorner.com/uploadfile/fc9f65/uploading-a-file-with-web-api-and-entity-framework-using-aja/) on the WEB API Post Controller:

    // POST: api/FileUploads
    [ResponseType(typeof(FileUpload))]
    public IHttpActionResult PostFileUpload()
    {
        if (HttpContext.Current.Request.Files.AllKeys.Any())
        {
            // Get the uploaded image from the Files collection  
            var httpPostedFile = HttpContext.Current.Request.Files["UploadedImage"];
            if (httpPostedFile != null)
            {
                FileUpload imgupload = new FileUpload();
                int length = httpPostedFile.ContentLength;
                imgupload.imagedata = new byte[length]; //get imagedata  
                httpPostedFile.InputStream.Read(imgupload.imagedata, 0, length);
                imgupload.imagename = Path.GetFileName(httpPostedFile.FileName);
                db.FileUploads.Add(imgupload);
                db.SaveChanges();
                // Make sure you provide Write permissions to destination folder
                string sPath = @"C:\Users\xxxx\Documents\UploadedFiles";
                var fileSavePath = Path.Combine(sPath, httpPostedFile.FileName);
                // Save the uploaded file to "UploadedFiles" folder  
                httpPostedFile.SaveAs(fileSavePath);
                return Ok("Image Uploaded");
            }
        }
        return Ok("Image is not Uploaded"); 
    }

On your UWP application, set the following method:

    using System;
    using System.Threading.Tasks;
    using Windows.Storage;
    using Windows.Storage.Streams;
    using Windows.Web.Http;
    // ...
    public static bool UploadImageToServer(StorageFile imageFile)
    {
        bool saveRes = false;
        try
        {
            using (HttpClient client = new HttpClient())
            {
                if (client != null) // if no Network Connection
                {
                    HttpResponseMessage response = new HttpResponseMessage();
                    Task task = Task.Run(async () =>
                    {
                        using (HttpMultipartFormDataContent formData = new HttpMultipartFormDataContent())
                        {
                            IBuffer buffer = await FileIO.ReadBufferAsync(imageFile);
                            HttpBufferContent WebHTTPContent = new HttpBufferContent(buffer);
                            formData.Add(WebHTTPContent, "UploadedImage", imageFile.Name);
                            response = await client.PostAsync(App.VehicleImageUri, formData);
                            if (response.IsSuccessStatusCode) saveRes = true;
                        }
                    });
                    task.Wait();
                }
            }
        }
        catch (Exception em)
        {
           // Handle exception here ... 
        }
        return saveRes;
    }

You call your method as follows:

private async void CaptureImageByUser()
{
    StorageFile file;

    // Create storage file in local app storage
    string fileName = GenerateNewFileName() + ".jpg";
    CreationCollisionOption collisionOption = CreationCollisionOption.GenerateUniqueName;

    file = await ApplicationData.Current.TemporaryFolder.CreateFileAsync(fileName, collisionOption);

    // Captures and stores new Jpeg image file
    await mediaCapture.CapturePhotoToStorageFileAsync(ImageEncodingProperties.CreateJpeg(), file);
    // Delete the file in the temporary location if successfully uploaded
    if (SaveDataByUser.UploadImageToServer(file)) await file.DeleteAsync();
}

private string GenerateNewFileName(string prefix = "IMG")
{
    return prefix + "_" + DateTime.UtcNow.ToString("yyyy-MMM-dd_HH-mm-ss");
}

Hey, let me know if it works for you!! Happy to help! :)