/// <summary>
/// Returns true if the counter is registered for this category
/// </summary>
public bool CounterExists(string counterName)
{
if (counterName == null)
{
throw new ArgumentNullException(nameof(counterName));
}
if (_categoryName == null)
{
throw new InvalidOperationException(SR.Format(SR.CategoryNameNotSet));
}
return(PerformanceCounterLib.CounterExists(_categoryName, counterName));
}
/// <summary>
/// Returns true if the instance already exists for this category.
/// </summary>
public bool InstanceExists(string instanceName)
{
if (instanceName == null)
{
throw new ArgumentNullException(nameof(instanceName));
}
if (_categoryName == null)
{
throw new InvalidOperationException(SR.Format(SR.CategoryNameNotSet));
}
using (var categorySample = PerformanceCounterLib.GetCategorySample(_categoryName))
{
return(categorySample._instanceNameTable.ContainsKey(instanceName));
}
}
/// <summary>
/// Returns true if the category is registered in the machine.
/// </summary>
public static bool Exists(string categoryName)
{
if (categoryName == null)
{
throw new ArgumentNullException(nameof(categoryName));
}
if (categoryName.Length == 0)
{
throw new ArgumentException(SR.Format(SR.InvalidParameter, nameof(categoryName), categoryName), nameof(categoryName));
}
if (PerformanceCounterLib.IsCustomCategory(categoryName))
{
return(true);
}
return(PerformanceCounterLib.CategoryExists(categoryName));
}
/// <summary>
/// Returns the instance names for a given category
/// </summary>
/// <internalonly/>
internal static string[] GetCounterInstances(string categoryName)
{
using (var categorySample = PerformanceCounterLib.GetCategorySample(categoryName))
{
if (categorySample._instanceNameTable.Count == 0)
{
return(Array.Empty <string>());
}
var instanceNames = new string[categorySample._instanceNameTable.Count];
categorySample._instanceNameTable.Keys.CopyTo(instanceNames, 0);
if (instanceNames.Length == 1 && instanceNames[0] == PerformanceCounterLib.SingleInstanceName)
{
return(Array.Empty <string>());
}
return(instanceNames);
}
}
/// <summary>
/// Returns true if the counter is registered for this category on a particular machine.
/// </summary>
public static bool CounterExists(string counterName, string categoryName)
{
if (counterName == null)
{
throw new ArgumentNullException(nameof(counterName));
}
if (categoryName == null)
{
throw new ArgumentNullException(nameof(categoryName));
}
if (categoryName.Length == 0)
{
throw new ArgumentException(SR.Format(SR.InvalidParameter, nameof(categoryName), categoryName), nameof(categoryName));
}
return(PerformanceCounterLib.CounterExists(categoryName, counterName));
}
