以编程方式启用IIS角色和功能

我正在尝试通过c#控制台应用程序启用IIS功能。它在windows 7和windows 8.1的机器上运行良好。但是当我在windows server 2008 R2和windows server 2012 R2上运行相同的代码时，它不起作用。我在这段代码中遗漏了什么?

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Management;
using System.Text.RegularExpressions;
namespace EnableIISComponents
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                SetupIIS();
                Console.WriteLine("Done. Press any key to close.");
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception occurred:" + ex.Message);
            }
            Console.ReadLine();
        }
    static string SetupIIS()
    {
        // In command prompt run this command to see all the features names which are equivalent to UI features.
        // c:'>dism /online /get-features /format:table 
        var featureNames = new List<string> 
                {
                    "IIS-ApplicationDevelopment",                        
                    "IIS-ISAPIExtensions",
                    "IIS-ISAPIFilter",
                    "IIS-CommonHttpFeatures",
                    "IIS-DefaultDocument",
                    "IIS-HttpErrors",
                    "IIS-StaticContent",
                    "IIS-HealthAndDiagnostics",
                    "IIS-HttpLogging",
                    "IIS-HttpTracing",
                    "IIS-WebServer",
                    "IIS-WebServerRole",
                    "IIS-ManagementConsole",
                };
        Console.WriteLine("Checking the Operating System...'n");
        ManagementObjectSearcher obj = new ManagementObjectSearcher("select * from Win32_OperatingSystem");
        try
        {
            foreach (ManagementObject wmi in obj.Get())
            {
                string Name = wmi.GetPropertyValue("Caption").ToString();
                // Remove all non-alphanumeric characters so that only letters, numbers, and spaces are left.
                // Imp. for 32 bit window server 2008
                Name = Regex.Replace(Name.ToString(), "[^A-Za-z0-9 ]", "");
                if (Name.Contains("Server 2012 R2") || Name.Contains("Windows 81"))
                {
                    featureNames.Add("IIS-ASPNET45");
                    featureNames.Add("IIS-NetFxExtensibility45");
                }
                else if (Name.Contains("Server 2008 R2") || Name.Contains("Windows 7"))
                {
                    featureNames.Add("IIS-ASPNET");
                    featureNames.Add("IIS-NetFxExtensibility");
                }
                else
                {
                    featureNames.Clear();
                }
                string Version = (string)wmi["Version"];
                string Architecture = (string)wmi["OSArchitecture"];
                Console.WriteLine("Operating System details:");
                Console.WriteLine("OS Name: " + Name);
                Console.WriteLine("Version: " + Version);
                Console.WriteLine("Architecture: " + Architecture + "'n");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception occurred:" + ex.Message);
        }
        return Run(
            "dism",
            string.Format(
                "/NoRestart /Online /Enable-Feature {0}",
                string.Join(
                    " ",
                    featureNames.Select(name => string.Format("/FeatureName:{0}", name)))));
    }
    static string Run(string fileName, string arguments)
    {
        Console.WriteLine("Enabling IIS features...");
        Console.WriteLine(arguments);
        using (var process = Process.Start(new ProcessStartInfo
        {
            FileName = fileName,
            Arguments = arguments,
            CreateNoWindow = true,
            WindowStyle = ProcessWindowStyle.Hidden,
            RedirectStandardOutput = true,
            UseShellExecute = false,
        }))
        {
            process.WaitForExit();
            return process.StandardOutput.ReadToEnd();
        }
    }
}
}

如果我通过命令提示符运行具有相同功能名称的dism命令，则IIS功能将被启用。为什么不配合这个项目呢?

我以管理员身份运行我的程序，右键单击并选择"以管理员身份运行"。

我已经创建了这个例子从这个链接的帮助。以编程方式安装IIS7的更好方法