验证ASP.Net Core中IFormFile的图像类型 [英] Validate Image type for IFormFile in ASP.Net Core

问题描述

我有一个ASP.NET Core应用程序，我需要验证上传的文件是图像，而不是具有图像扩展名的非图像文件.... 我发现并有意义的所有解决方案都使用System.Drawing.Image或ASP.NET Core中不可用的类似类. 您能推荐一个替代方法吗? *请注意，我并不是要检查扩展名，而是要检查其内容.

I have an ASP.NET Core application and I need to validate that the uploaded file is an image and not a non-image file which has an image extension.... All solutions that I found and makes sense use System.Drawing.Image or similar classes that aren't available in ASP.NET Core. Can you kindly suggest an alternative? *Please note that I'm not trying to check the extension but the contents.

谢谢

推荐答案

现在，.System.Drawing.Common" NuGet可用于.NET Core.

Now "System.Drawing.Common" NuGet is available for .NET Core.

您可以执行以下操作来验证可能"的图像:

You can do the following to validate the "possible" images:

using System.Drawing;
// ...
public bool IsImage(byte[] data)
{
  var dataIsImage = false;
  using (var imageReadStream = new MemoryStream(data))
  {
    try
    {
      using (var possibleImage = Image.FromStream(imageReadStream))
      {
      }
      dataIsImage = true;
    }
    // Here you'd figure specific exception to catch. Do not leave like that.
    catch
    {
      dataIsImage = false;
    }
  }

  return dataIsImage;
}

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