如何遍历当前进程中的AppDomain

public static IList<AppDomain> GetAppDomains()
{
    IList<AppDomain> list = new List<AppDomain>();
    IntPtr enumHandle = IntPtr.Zero;
    CorRuntimeHostClass host = new CorRuntimeHostClass();
    try
    {
        host.EnumDomains(out enumHandle);
        object domain = null;
        while (true)
        {
            host.NextDomain(enumHandle, out domain);
            if (domain == null) break;
            AppDomain appDomain = (AppDomain)domain;
            list.Add(appDomain);
        }
        return list;
    }
    catch (Exception e)
    {
        return null;
    }
    finally 
    {
        host.CloseEnum(enumHandle); 
        Marshal.ReleaseComObject(host); 
    }
}