asp.net core webAPI

Question

How to store image in database using asp.net core api?

Vishal Yelve · Answer

Hi Tahir, I am saving file at location and saving file name in db. [Route("SaveFile")] [HttpPost] public JsonResult SaveFile() { try { var httpRequest = Request.Form; var postedFile = httpRequest.Files[0]; string filename = postedFile.FileName; var physicalPath = _env.ContentRootPath + "/Photos/" + filename; using (var stream = new FileStream(physicalPath, FileMode.Create)) { stream.CopyTo(stream); } return new JsonResult(filename); } catch (Exception) { return new JsonResult("anonymous.png"); } } You can refer to my code --> https://github.com/vyelve/.NETCoreWebAPICRUD OR [BindProperty] public IFormFile ImageFile { get; set; } public string Msg { get; set; } public static readonly List ImageExtensions = new() { ".JPG", ".BMP", ".PNG" }; //to restrict file extensions if (HttpContext.Request.Form.Files.Count > 0)// check if the user uploded something { ImageFile = HttpContext.Request.Form.Files.GetFile("file_Main"); if (ImageFile != null) { var extension = Path.GetExtension(ImageFile.FileName);//get file name if (ImageExtensions.Contains(extension.ToUpperInvariant())) { using var dataStream = new MemoryStream(); await ImageFile.CopyToAsync(dataStream); byte[] imageBytes = dataStream.ToArray(); // you can save this to your byte array variable and remove the 2 lines below string base64String = Convert.ToBase64String(imageBytes); User.UserPicture = base64String; // to save the image as base64String } else { Msg = "image format must be in JPG, BMP or PNG"; //Custom error message return Page(); } } } }

Sachin Singh · Answer

1. use below classes public class Attachment { [Key] public int id { get; set; } [Column(TypeName = "nvarchar(50)")] public string FileName { set; get; } [Column(TypeName = "nvarchar(50)")] public string Description { set; get; } [Column(TypeName = "varbinary(MAX)")] public byte[] attachment { set; get; } } public class AttachmentViewModel { public string FileName { set; get; } public string Description { set; get; } public IFormFile attachment { set; get; } public List attachments { get; set; } } 2. create following extension methods (use for professional projects) public static string GetContenttype(string fileName) { var provider = new Microsoft.AspNetCore.StaticFiles.FileExtensionContentTypeProvider(); string contentType; if (!provider.TryGetContentType(fileName, out contentType)) { contentType = "application/octet-stream"; } return contentType; } public static string CreateUniqueFileExtension(string fileName) { fileName = Path.GetFileName(fileName); return Path.GetFileNameWithoutExtension(fileName) + "_" + Guid.NewGuid().ToString().Substring(0, 4) + Path.GetExtension(fileName); } public static byte[] GetByteArrayFromImage(IFormFile file) { using (var target = new MemoryStream()) { file.CopyTo(target); return target.ToArray(); } } 3. use below code in your api method var uniqueFileName = SPClass.CreateUniqueFileExtension(model.attachment.FileName); var uploads = Path.Combine(_hostingEnvironment.WebRootPath, "attachment"); var filePath = Path.Combine(uploads, uniqueFileName); model.attachment.CopyTo(new FileStream(filePath, FileMode.Create)); //save the attachment to the database Attachment attachment = new Attachment(); attachment.FileName = uniqueFileName; attachment.Description = model.Description; attachment.attachment = SPClass.GetByteArrayFromImage(model.attachment); _appContext.attachments.Add(attachment); _appContext.SaveChanges(); //where model is viewModel as parameter of your api

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