Image validation in mvc modle.

5y756Learn iOS Programming

Hello i have upload image this name image266.png and i have implement modle validation .But i have face issue

i have upload (image266.png) this name type image show error (only image file allow).

How to solve this.

MVC

3 Replies

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Sachin Singh5y ago
Accepted answer
check file extension when you are uploading file and then set error message if file type is not valid
string filename=file.FileName;
                var ext = filename.Substring(filename.LastIndexOf(".")+1).ToLower();
                if(ext=="jpeg"||ext=="jpg"){
                     string path = Server.MapPath("~/uploads/" + filename);
                file.SaveAs(path);
       else{
        viewbag.ErrorMessage="file type not supported"
}
Mageshwaran R5y ago
Hi Sourabh Dhinam,
please refer this link,It may help you,

https://www.c-sharpcorner.com/article/file-upload-extension-validation-in-asp-net-mvc-and-javascript/

https://stackoverflow.com/questions/6388812/how-to-validate-uploaded-file-in-asp-net-mvc
Farhan Ahmed5y ago
Custom Validation
public class ValidateFileAttribute : RequiredAttribute
{
    public override bool IsValid(object value)
    {
        var file = value as HttpPostedFileBase;
        if (file == null)
        {
            return false;
        }

        if (file.ContentLength > 1 * 1024 * 1024)
        {
            return false;
        }

        try
        {
            using (var img = Image.FromStream(file.InputStream))
            {
                return img.RawFormat.Equals(ImageFormat.Png);
            }
        }
        catch { }
        return false;
    }
}
Model
public class MyViewModel
{
    [ValidateFile(ErrorMessage = "Please select a PNG image smaller than 1MB")]
    public HttpPostedFileBase File { get; set; }
}
Controller
public class HomeController : Controller
{
    public ActionResult Index()
    {
        var model = new MyViewModel();
        return View(model);
    }

    [HttpPost]
    public ActionResult Index(MyViewModel model)
    {
        if (!ModelState.IsValid)
        {
            return View(model);
        }

        // The uploaded image corresponds to our business rules => process it

        var fileName = Path.GetFileName(model.File.FileName);
        var path = Path.Combine(Server.MapPath("~/App_Data"), fileName);
        model.File.SaveAs(path);

        return Content("Thanks for uploading", "text/plain");
    }
}
View
@model MyViewModel

@using (Html.BeginForm("Index", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    @Html.LabelFor(x => x.File)
    "file" name="@Html.NameFor(x => x.File)" id="@Html.IdFor(x => x.File)" />
    @Html.ValidationMessageFor(x => x.File)
    "submit" value="upload" />
}