Windows系统：带有扩展名关联列表和启动应用程序 [英] Windows: List and Launch applications associated with an extension

问题描述

如何确定带有特定扩展名（例如.JPG）相关联的应用程序，然后确定可执行文件到该应用程序的位置使得它可以通过一个呼叫发起说System.Diagnostics.Process.Start（.. ）。

How to determine the applications associated with a particular extension (e.g. .JPG) and then determine where the executable to that application is located so that it can be launched via a call to say System.Diagnostics.Process.Start(...).

我已经知道了如何读取和写入注册表。这是注册表，使得它很难确定哪些应用程序的扩展名相关联的标准方法的布局，什么是有显示名称，并在它们的可执行文件的位置。

I already know how to read and write to the registry. It is the layout of the registry that makes it harder to determine in a standard way what applications are associated with an extension, what are there display names, and where their executables are located.

推荐答案

样品code：

using System;
using Microsoft.Win32;

namespace GetAssociatedApp
{
    class Program
    {
        static void Main(string[] args)
        {
            const string extPathTemplate = @"HKEY_CLASSES_ROOT\{0}";
            const string cmdPathTemplate = @"HKEY_CLASSES_ROOT\{0}\shell\open\command";

            // 1. Find out document type name for .jpeg files
            const string ext = ".jpeg";

            var extPath = string.Format(extPathTemplate, ext);

            var docName = Registry.GetValue(extPath, string.Empty, string.Empty) as string;
            if (!string.IsNullOrEmpty(docName))
            {
                // 2. Find out which command is associated with our extension
                var associatedCmdPath = string.Format(cmdPathTemplate, docName);
                var associatedCmd = 
                    Registry.GetValue(associatedCmdPath, string.Empty, string.Empty) as string;

                if (!string.IsNullOrEmpty(associatedCmd))
                {
                    Console.WriteLine("\"{0}\" command is associated with {1} extension", associatedCmd, ext);
                }
            }
        }
    }
}

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