检测网络状态以及程序安装状态

一、检测网络状态

try
    {
        Dns.GetHostEntry("www.google.com"); //using System.Net;
        return true;
    }
    catch //(SocketException ex)
    {
        return false;
    }

二、检测程序安装状态（通过注册表）

private static bool CheckSoftWartInstallState(string softWareName)
    {
        Microsoft.Win32.RegistryKey uninstallNode =
            Microsoft.Win32.Registry.LocalMachine.OpenSubKey
            (@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall",
             Microsoft.Win32.RegistryKeyPermissionCheck.ReadWriteSubTree,
             System.Security.AccessControl.RegistryRights.ReadKey);
        foreach (string subKeyName in uninstallNode.GetSubKeyNames())
        {
            Microsoft.Win32.RegistryKey subKey = uninstallNode.OpenSubKey(subKeyName);
            object displayName = subKey.GetValue("DisplayName");
            if (displayName != null)
            {
                if (displayName.ToString().Contains(softWareName))
                {
                    return true;
                }
            }
        }
        return false;
    }