C # Implementation of probeContentType in Java 7

A new method, probeContentType, is added to Java 7. Its main function is to determine the content type of a file. The Code is as follows:

import java.io.IOException;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;public class FileContentType {    public static void main(String[] args) {                printContentType("D:/Downloads/java.txt");        printContentType("D:/Downloads/java.ppt");        printContentType("D:/Downloads/java.doc");        printContentType("D:/Downloads/java.avi");    }    private static void printContentType(String pathToFile) {                Path path = Paths.get(pathToFile);        String contentType = null;        try {            contentType = Files.probeContentType(path);        } catch (IOException e) {                  e.printStackTrace();        }        System.out.println("File content type is : " + contentType);    }}

There is no corresponding method in C #, but it is not difficult to implement the same function.

using System;using System.IO;using Microsoft.Win32; namespace Demo{    class Program    {        static void Main(string[] args)        {            PrintContentType("D:/Downloads/java.txt");            PrintContentType("D:/Downloads/java.ppt");            PrintContentType("D:/Downloads/java.doc");            PrintContentType("D:/Downloads/java.jar");             Console.ReadKey();        }         private static void PrintContentType(string pathToFile)        {            string result = string.Empty;            string ext = Path.GetExtension(pathToFile);            using (RegistryKey registryKey = Registry.ClassesRoot.OpenSubKey(ext))            {                if (registryKey != null)                {                    var value = registryKey.GetValue("Content Type");                    result = value == null ? "null" : value.ToString();                }            }            Console.WriteLine(result);        }    }}

Because the relevant content type information can be obtained from the Registry, you only need to perform some operations on the registry to achieve the same function.

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