/// <summary>
/// Gets the Windows Management Instrumentation (WMI) objects by subject.
/// </summary>0
/// <typeparam name="T">Type of callback.</typeparam>
/// <param name="subject">The subject which you want to get.</param>
/// <param name="transpiler">Uses the <seealso cref="Transpiler.Dynamic"/> or <seealso cref="Transpiler.ReadOnlyDictionary"/> to get the value.</param>
/// <param name="localOnly">finds only local fields.</param>
/// <returns></returns>
public static IReadOnlyList <T> Get <T>(WmiSubject subject, ITranspiler <T> transpiler, bool localOnly = true, TimeSpan?timeout = null)
{
var searcher = new ManagementObjectSearcher($"select * from {subject}");
if (timeout is TimeSpan ts)
{
searcher.Options.Timeout = ts;
}
var collection = default(ManagementObjectCollection);
try
{
collection = searcher.Get();
var list = new List <T>(collection.Count);
foreach (ManagementObject mo in collection)
{
var dict = transpiler.Create();
try
{
foreach (var pd in mo.Properties)
{
if ((localOnly && pd.IsLocal) || !localOnly)
{
var name = pd.Name;
if (!CimTypeConverter.TryConvert(pd.Type, pd.IsArray, pd.Value, out var value))
{
continue;
}
// todo: makes filter optional.
if (value == null || (value is string s && string.IsNullOrWhiteSpace(s)))
{
continue;
}
dict.Add(name, value);
}
}
}
catch
{
continue;
}
list.Add(transpiler.Convert(dict));
}
return(list);
}
catch
{
return(DefaultCache <T> .Array);
}
finally
{
(collection as IDisposable)?.Dispose();
}
}
private static bool IsWmiSubject(string s, out WmiSubject subject)
{
var k = Enum.GetNames(typeof(WmiSubject));
for (int i = 0; i < k.Length; i++)
{
var c = k[i];
if (string.Equals(c, s, StringComparison.CurrentCultureIgnoreCase))
{
return(Enum.TryParse(s, true, out subject));
}
}
subject = (WmiSubject)(-1);
return(false);
}
public static async Task <IReadOnlyList <T> > GetAsync <T>(WmiSubject subject, ITranspiler <T> transpiler, bool localOnly = true, TimeSpan?timeout = null, CancellationToken token = default(CancellationToken))
{
return(await Task.Factory.StartNew(() => Get(subject, transpiler, localOnly, timeout), token, TaskCreationOptions.LongRunning, Task.Factory.Scheduler));
}