public T QuerySingleOrDefault <T>()
{
string className = WmiHelper.GetClassName <T>();
if (string.IsNullOrEmpty(className))
{
throw new NullReferenceException($"Type of {typeof(T)} does not use {typeof(WmiClassAttribute)}. This is required.");
}
string searchableProperties = WmiHelper.GetSearchableProperties <T>();
return(this.QuerySingleOrDefault <T>(WmiHelper.GetNamespace <T>(), $"SELECT {searchableProperties} FROM {className}"));
}
public IEnumerable <T> Query <T>(string @namespace, string query)
{
if (!query.StartsWith("SELECT", StringComparison.OrdinalIgnoreCase))
{
throw new InvalidOperationException($"The query is not a select statement.");
}
scope.Path = new ManagementPath(@namespace);
using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, new ObjectQuery(query)))
using (ManagementObjectCollection wmiRes = searcher.Get())
{
foreach (ManagementObject mo in wmiRes)
{
yield return(WmiHelper.LoadType <T>(mo));
}
}
}
/// <summary>
/// Query a single record of type <typeparamref name="T"/>.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="namespace">The wmi namespace to query.
/// <param name="query">What to select using WMI Query Language</param>
/// <returns></returns>
public T QuerySingleOrDefault <T>(string @namespace, string query)
{
if (!query.StartsWith("SELECT", StringComparison.OrdinalIgnoreCase))
{
throw new InvalidOperationException($"The query is not a select statement.");
}
T result = default(T);
scope.Path = new ManagementPath(@namespace);
using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, new ObjectQuery(query)))
using (ManagementObjectCollection wmiRes = searcher.Get())
{
foreach (ManagementObject mo in wmiRes)
{
result = WmiHelper.LoadType <T>(mo);
break;
}
}
return(result);
}
