在MVC 6中调整上传图像大小的最佳方法是什么？我想存储图像的多个变体(例如小,大等),以便能够选择稍后显示的内容.
这是我的行动代码.
[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));
}
解决方法
我建议使用Image Processor库.
http://imageprocessor.org/imageprocessor/
然后你可以做一些事情：
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);
}
