[Column(TypeName = "image")]
public byte[] Avatar { get; set; }

我认为您需要告诉EF您正在以这种方式使用它.尝试使用上述图像批注.

I think you need to tell EF that you are using it in this fashion. Try using the image annotation as above.

这将确保将您的字段创建为图像类型；为这种情况设计的.

This will make sure your field is created as the image type; designed for this type of scenario.

编辑:请查看注释以获取最终的答案.

Please see the comments for the answer that eventually worked.