asp.net core upload image code example

Example 1: 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 2: 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");
}