C# 檔案對應fiel Content Tyoe

http://www.dotblogs.com.tw/larrynung/archive/2011/03/24/22049.aspx

private static string GetContentTypeForFileName(string fileName) 

{ 

    string ext = System.IO.Path.GetExtension(fileName); 

    using (Microsoft.Win32.RegistryKey registryKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext)) 

    { 

        if (registryKey == null) 

            return null; 

        var value = registryKey.GetValue("Content Type"); 

        return (value == null) ? string.Empty : value.ToString(); 

    } 

} 

完整範例如下：

using System; 

using System.Collections.Generic; 

using System.Linq; 

using System.Text; 

namespace ConsoleApplication10 

{ 

    class Program 

    { 

        static void Main(string[] args) 

        { 

            const string file = @"C:\Users\Public\Music\Sample Music\Sleep Away.mp3"; 

            Console.WriteLine(GetContentTypeForFileName(file)); 

        } 

        private static string GetContentTypeForFileName(string fileName) 

        { 

            string ext = System.IO.Path.GetExtension(fileName); 

            using (Microsoft.Win32.RegistryKey registryKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext)) 

            { 

                if (registryKey == null) 

                    return null; 

                var value = registryKey.GetValue("Content Type"); 

                return (value == null) ? string.Empty : value.ToString(); 

            } 

        }    } 

}