asp.net core image upload code example

Example 1: save image IFOrmFile to path in asp.net 5 C# web api

[Route("api/[controller]")]
[ApiController]
public class CarsController : ControllerBase
{
    private readonly IHostingEnvironment _hostingEnv;
    private readonly WebAPIDbContext _context;

    public CarsController(WebAPIDbContext context, IHostingEnvironment hostingEnv)
    {
        _hostingEnv = hostingEnv;
        _context = context;
    }

    [HttpPost]
    public async Task<ActionResult> Post([FromForm] CarViewModel carVM)
    {
        if (carVM.Image != null)
        {
            var a = _hostingEnv.WebRootPath;
            var fileName = Path.GetFileName(carVM.Image.FileName);
            var filePath = Path.Combine(_hostingEnv.WebRootPath, "images\\Cars", fileName);

            using (var fileSteam = new FileStream(filePath, FileMode.Create))
            {
                await carVM.Image.CopyToAsync(fileSteam);
            }

            Car car = new Car();
            car.CarName = carVM.CarName;
            car.ImagePath = filePath;  //save the filePath to database ImagePath field.
            _context.Add(car);
            await _context.SaveChangesAsync();
            return Ok();
        }
        else
        {
            return BadRequest();
        }
    }
}

Example 2: save image IFOrmFile to path in asp.net 5 C# web api

using Microsoft.AspNetCore.Hosting;

public class ImageController : Controller
{
    private readonly IWebHostEnvironment _hostEnvironment;

    public ImageController(..., IWebHostEnvironment hostEnvironment)
    {
        ...
        this._hostEnvironment = hostEnvironment;
    }

  ...

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Create([Bind("ImageId,Title,ImageFile")] ImageModel imageModel)
    {
        if (ModelState.IsValid)
        {
            //Save image to wwwroot/image
            string wwwRootPath = _hostEnvironment.WebRootPath;
            string fileName = Path.GetFileNameWithoutExtension(imageModel.ImageFile.FileName);
            string extension = Path.GetExtension(imageModel.ImageFile.FileName);
            imageModel.ImageName=fileName = fileName + DateTime.Now.ToString("yymmssfff") + extension;
            string path = Path.Combine(wwwRootPath + "/Image/", fileName);
            using (var fileStream = new FileStream(path,FileMode.Create))
            {
                await imageModel.ImageFile.CopyToAsync(fileStream);
            }
            //Insert record
            _context.Add(imageModel);
            await _context.SaveChangesAsync();
            return RedirectToAction(nameof(Index));
        }
        return View(imageModel);
    }

  ....

}

Example 3: asp net core image server

[HttpPost]
public ActionResult RetrieveImage()
{
    Image img = db.Images.OrderByDescending
(i=>i.Id).SingleOrDefault();
    string imageBase64Data = 
Convert.ToBase64String(img.ImageData);
    string imageDataURL = 
string.Format("data:image/jpg;base64,{0}", 
imageBase64Data);
    ViewBag.ImageTitle = img.ImageTitle;
    ViewBag.ImageDataUrl = imageDataURL;
    return View("Index");
}