在MVC 6中调整上传的图像大小

在MVC 6中调整上传图像的最佳方式是什么? 我想存储图像的多个变体(如小,大等),以便能够选择稍后显示的图像。

这是我的代码。

    [HttpPost]
    public async Task<IActionResult> UploadPhoto()
    {
        if (Request.Form.Files.Count != 1)
            return new HttpStatusCodeResult((int)HttpStatusCode.BadRequest);

        IFormFile file = Request.Form.Files[0];

        // calculate hash
        var sha = System.Security.Cryptography.SHA256.Create();
        byte[] hash = sha.ComputeHash(file.OpenReadStream());

        // calculate name and patch where to store the file
        string extention = ExtentionFromContentType(file.ContentType);
        if (String.IsNullOrEmpty(extention))
            return HttpBadRequest("File type not supported");

        string name = WebEncoders.Base64UrlEncode(hash) + extention;
        string path = "uploads/photo/" + name;

        // save the file
        await file.SaveAsAsync(this.HostingEnvironment.MapPath(path));
     }

我会建议使用图像处理器库。

http://imageprocessor.org/imageprocessor/

然后,你可以按照以下方法做一些事情:

using (var imageFactory = new ImageFactory())
using (var fileStream = new FileStream(path))
{
    file.Value.Seek(0, SeekOrigin.Begin);

    imageFactory.FixGamma = false;
    imageFactory.Load(file.Value)
                .Resize(new ResizeLayer(new Size(264, 176)))
                .Format(new JpegFormat
                {
                    Quality = 100
                })
                .Quality(100)
                .Save(fileStream);
}

其中file.Value是您上传的文件(流)(我不知道它在MVC中是什么,这是我在南希项目中使用的代码)

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