c# 遍历所有安装程序 获取所有已经安装的程序

/// <summary>
/// 获取所有已经安装的程序
/// </summary>
/// <param name="reg"></param>
/// <returns>程序名称,安装路径</returns> 
private static List<Dictionary<string, string>> GetProgramAndPath()
{
    var reg = new string[] {
        @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall",
        @"SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall"
        };
    string tempType = null;
    int softNum = 0;//所有已经安装的程序数量
    RegistryKey currentKey = null;
    var ls = new List<Dictionary<string, string>>();
    foreach (var item222 in reg)
    {
        object displayName = null, uninstallString = null, installLocation = null, releaseType = null;
        RegistryKey pregkey = Registry.LocalMachine.OpenSubKey(item222);//获取指定路径下的键 
        foreach (string item in pregkey.GetSubKeyNames())               //循环所有子键
        {
            currentKey = pregkey.OpenSubKey(item);
            displayName = currentKey.GetValue("DisplayName");           //获取显示名称
            installLocation = currentKey.GetValue("InstallLocation");   //获取安装路径
            uninstallString = currentKey.GetValue("UninstallString");   //获取卸载字符串路径
            releaseType = currentKey.GetValue("ReleaseType");           //发行类型,值是Security Update为安全更新,Update为更新
            bool isSecurityUpdate = false;
            if (releaseType != null)
            {
                tempType = releaseType.ToString();
                if (tempType == "Security Update" || tempType == "Update")
                {
                    isSecurityUpdate = true;
                }
            }
            if (!isSecurityUpdate && displayName != null && uninstallString != null)
            {
                softNum++;
                if (installLocation == null)
                {
                    ls.Add(new Dictionary<string, string> { { displayName.ToString(), "" } });
                }
                else
                {
                    ls.Add(new Dictionary<string, string> { { displayName.ToString(), installLocation.ToString() } });
                }
            }
        }
    }
    return ls;
}