asp.net-mvc – 在MVC中检查图像mime,大小等

这是我发现检查文件的类

public static class HttpPostedFileBaseExtensions
{
    public const int ImageMinimumBytes = 512;

    public static bool IsImage(this HttpPostedFileBase postedFile)
    {            
        //-------------------------------------------
        //  Check the image mime types
        //-------------------------------------------
        if (postedFile.ContentType.ToLower() != "image/jpg" &&
                    postedFile.ContentType.ToLower() != "image/jpeg" &&
                    postedFile.ContentType.ToLower() != "image/pjpeg" &&
                    postedFile.ContentType.ToLower() != "image/gif" &&
                    postedFile.ContentType.ToLower() != "image/x-png" &&
                    postedFile.ContentType.ToLower() != "image/png")
        {
            return false;
        }

        //-------------------------------------------
        //  Check the image extension
        //-------------------------------------------
        if (Path.GetExtension(postedFile.FileName).ToLower() != ".jpg"
            && Path.GetExtension(postedFile.FileName).ToLower() != ".png"
            && Path.GetExtension(postedFile.FileName).ToLower() != ".gif"
            && Path.GetExtension(postedFile.FileName).ToLower() != ".jpeg")
        {
            return false;
        }

        //-------------------------------------------
        //  Attempt to read the file and check the first bytes
        //-------------------------------------------
        try
        {
            if (!postedFile.InputStream.CanRead)
            {
                return false;
            }

            if (postedFile.ContentLength < ImageMinimumBytes)
            {
                return false;
            }

            byte[] buffer = new byte[512];
            postedFile.InputStream.Read(buffer,512);
            string content = System.Text.Encoding.UTF8.GetString(buffer);
            if (Regex.IsMatch(content,@"<script|<html|<head|<title|<body|<pre|<table|<as+href|<img|<plaintext|<cross-domain-policy",RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Multiline))
            {
                return false;
            }
        }
        catch (Exception)
        {
            return false;
        }

        //-------------------------------------------
        //  Try to instantiate new Bitmap,if .NET will throw exception
        //  we can assume that it's not a valid image
        //-------------------------------------------

        try
        {
            using (var bitmap = new System.Drawing.Bitmap(postedFile.InputStream))
            {
            }
        }
        catch (Exception)
        {
            return false;
        }

        return true;
    }
}

我的个人资料班

public class Profile
{
    public int ProfileID { get; set; }
    [Required(ErrorMessage = "Please enter a profile name")]
    public string Name { get; set; }
    [Required(ErrorMessage = "Please enter a intro")]
    public string Intro { get; set; }
    [Required(ErrorMessage = "Please enter a description")]
    public string Description { get; set; }
    public decimal Rate { get; set; }
    public byte[] ImageData { get; set; }
    public string ImageMimeType { get; set; }
}

我更改后的ProfileController.我添加了HttpPostedFileBase作为参数,并且还使用了这一行,如果(HttpPostedFileBaseExtensions.IsImage(file)== true),我认为它会将其排序,但没有任何区别.

[HttpPost]
    public ActionResult Edit(Profile profile,HttpPostedFileBase file)
    {
        if (HttpPostedFileBaseExtensions.IsImage(file) == true)
            {
                if (ModelState.IsValid)
                    {               

                        repository.SaveProfile(profile);
                        TempData["message"] = string.Format("{0} has been saved",profile.Name);
                        return RedirectToAction("List");
                    }
                 else
                    {
                        // there is something wrong with the data values
                        return View(profile);
                    }
            }
        else
        {
            return View(ViewBag);
        }            
    }

最后来自存储库的SaveProfile方法.

public void SaveProfile(Profile profile)
    {
        Profile dbEntry = context.Profiles.Find(profile.ProfileID);                        
        if (profile.ProfileID == 0)
        {
            context.Profiles.Add(profile);
        }
        else
        {
            if (dbEntry != null)
            {                    
                    dbEntry.Name = profile.Name;
                    dbEntry.Rate = profile.Rate;
                    dbEntry.Intro = profile.Intro;
                    dbEntry.Description = profile.Description;
                if (profile.ImageData != null)
                {

                    dbEntry.ImageData = profile.ImageData;
                    dbEntry.ImageMimeType = profile.ImageMimeType;
                }                                                               
            }
        }
        context.SaveChanges();
    }

我还尝试编辑SaveProfile方法,但是无法像在类中那样实现所有函数,而只是将它分开并按原样使用它.任何想法我哪里出错了？