//获取域名
private string getDomain()
{
    string Domain = Environment.UserDomainName;
    SelectQuery query = new SelectQuery("Win32_ComputerSystem");
    using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(query))
    {
        foreach (ManagementObject mo in searcher.Get())
        {
            if ((bool)mo["partofdomain"])
            {
                Domain = mo["domain"].ToString();
                break;
            }
        }
    }
    Domain = Domain.ToUpper();
    return Domain;
}

//获取本机的IP地址
public string getIPAddr()
{
    string IPAddr = string.Empty;
    try
    {
        IPHostEntry IPHE = new IPHostEntry();
        IPHE = Dns.GetHostEntry(Dns.GetHostName());
        for (int i = 0; i < IPHE.AddressList.Length; i++)
        {
            if (IPHE.AddressList[i].ToString().Length < 7)
            {
                continue;
            }
            if (IPHE.AddressList[i].ToString().IndexOf(":") > 0)
            {
                continue;
            }
            IPAddr = IPAddr + IPHE.AddressList[i].ToString() + ";";
        }
    }
    catch (Exception e)
    {
        return "";
    }
    return IPAddr;
}

//获取MAC地址
public string getMacAddr()
{
    string mac = string.Empty;
    SelectQuery query = new SelectQuery("Win32_NetworkAdapterConfiguration");
    using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(query))
    {
        ManagementObjectCollection queryCollection = searcher.Get();
        foreach (ManagementObject mo in searcher.Get())
        {
            if (mo["IPEnabled"].ToString() == "True")
            {
                mac = mo["MacAddress"].ToString();
                break;
            }
        }
    }
    return mac;
}

 Process[] processes = Process.GetProcesses();

var os = new ComputerInfo();