確定圖像文件的格式？

Question

如何以編程方式確定圖像文件的圖像格式，包括特定的編碼（如TIFF組）？

Answer 1

在這裏看到我的回答：

Find image format using Bitmap object in C#

using System.Linq; 

//... 

//get image 
var file_bytes = System.Convert.FromBase64String(@"iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="); 
var file_stream = new System.IO.MemoryStream(file_bytes); 
var file_image = System.Drawing.Image.FromStream(file_stream); 

//get image format 
var file_image_format = typeof(System.Drawing.Imaging.ImageFormat).GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static).ToList().ConvertAll(property => property.GetValue(null, null)).Single(image_format => image_format.Equals(file_image.RawFormat)); 
System.Diagnostics.Debug.WriteLine(file_image_format, "file_image_format"); 

//get image codec 
var file_image_format_codec = System.Drawing.Imaging.ImageCodecInfo.GetImageDecoders().ToList().Single(image_codec => image_codec.FormatID == file_image.RawFormat.Guid); 
System.Diagnostics.Debug.WriteLine(file_image_format_codec.CodecName + ", mime: " + file_image_format_codec.MimeType + ", extension: " + file_image_format_codec.FilenameExtension, "image_codecs", "file_image_format_type"); 

Answer 2

如果你沒有找到任何現成的庫我想你應該打開文件作爲二進制文件，並尋找標題數據，這意味着你必須知道你想支持的每種格式的頭文件的樣子。