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   源码介绍

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namespace SystemMonitor
{
	/// <summary>
	/// Summary description for SystemData.
	/// </summary>
	public class SystemData
	{
		#region "Constructor"
		public SystemData()
		{
			PerformanceCounterCategory cat = new PerformanceCounterCategory("Network Interface");
			_instanceNames = cat.GetInstanceNames();

			_netRecvCounters = new PerformanceCounter[_instanceNames.Length];
			for (int i =0; i<_instanceNames.Length; i  )
				_netRecvCounters[i] = new PerformanceCounter();

			_netSentCounters = new PerformanceCounter[_instanceNames.Length];
			for (int i =0; i<_instanceNames.Length; i  )
				_netSentCounters[i] = new PerformanceCounter();

			_compactFormat = false;
		}
		#endregion

		#region "Properties"
		public bool CompactFormat
		{
			get { return _compactFormat; }
			set { _compactFormat = value; }
		}
		#endregion


		#region "Public Methods"
		public string GetProcessorData()
		{
			double d = GetCounterValue(_cpuCounter, "Processor", "% Processor Time", "_Total");
			return _compactFormat? (int)d  "%": d.ToString("F")  "%";
		}

		public string GetMemoryVData()
		{
			string str;
			double d = GetCounterValue(_memoryCounter, "Memory", "% Committed Bytes In Use", null);
			str = d.ToString("F")  "% (";

			d = GetCounterValue(_memoryCounter, "Memory", "Committed Bytes", null);
			str  = FormatBytes(d)  " / ";

			d = GetCounterValue(_memoryCounter, "Memory", "Commit Limit", null);
			return str  FormatBytes(d)  ") ";	
		}

		public string GetMemoryPData()
		{
			string s = QueryComputerSystem("totalphysicalmemory");
			double totalphysicalmemory = Convert.ToDouble(s);

			double d = GetCounterValue(_memoryCounter, "Memory", "Available Bytes", null);
			d = totalphysicalmemory - d;

			s = _compactFormat? "%": "% ("   FormatBytes(d)  " / "  FormatBytes(totalphysicalmemory)  ")";
			d /= totalphysicalmemory;
			d *= 100;
			return _compactFormat? (int)d  s: d.ToString("F")   s;
		}

		public enum DiskData {ReadAndWrite, Read, Write};

		public double GetDiskData(DiskData dd)
		{
			return	dd==DiskData.Read? 
						GetCounterValue(_diskReadCounter, "PhysicalDisk", "Disk Read Bytes/sec", "_Total"):
					dd==DiskData.Write? 
						GetCounterValue(_diskWriteCounter, "PhysicalDisk", "Disk Write Bytes/sec", "_Total"):
					dd==DiskData.ReadAndWrite? 
						GetCounterValue(_diskReadCounter, "PhysicalDisk", "Disk Read Bytes/sec", "_Total") 
						GetCounterValue(_diskWriteCounter, "PhysicalDisk", "Disk Write Bytes/sec", "_Total"):
					0;
		}

		public enum NetData {ReceivedAndSent, Received, Sent};

		public double GetNetData(NetData nd)
		{
			if (_instanceNames.Length==0) 
				return 0;

			double d =0;
			for (int i=0; i<_instanceNames.Length; i  )
			{
				d  = nd==NetData.Received? 
						GetCounterValue(_netRecvCounters[i], "Network Interface", "Bytes Received/sec", _instanceNames[i]):
					nd==NetData.Sent? 
						GetCounterValue(_netSentCounters[i], "Network Interface", "Bytes Sent/sec", _instanceNames[i]):
					nd==NetData.ReceivedAndSent? 
						GetCounterValue(_netRecvCounters[i], "Network Interface", "Bytes Received/sec", _instanceNames[i])  
						GetCounterValue(_netSentCounters[i], "Network Interface", "Bytes Sent/sec", _instanceNames[i]):
					0;
			}

			return d;
		}

		enum Unit {B, KB, MB, GB, ER}
		public string FormatBytes(double bytes)
		{
			int unit = 0;
			while (bytes>1024) 
			{
				bytes /= 1024;
				  unit;
			}

			string s = _compactFormat? ((int)bytes).ToString(): bytes.ToString("F")  " ";
			return s  ((Unit)unit).ToString();
		}

		public string QueryComputerSystem(string type)
		{
			string str = null;
			ManagementObjectSearcher objCS = new ManagementObjectSearcher("SELECT * FROM Win32_ComputerSystem");
			foreach ( ManagementObject objMgmt in objCS.Get() )
			{
				str = objMgmt[type].ToString();
			}
			return str;
		}

		public string QueryEnvironment(string type)
		{
			return Environment.ExpandEnvironmentVariables(type);
		}

		public string LogicalDisk()
		{
			string diskSpace = string.Empty;
			object device, space;
			ManagementObjectSearcher objCS = new ManagementObjectSearcher("SELECT * FROM Win32_LogicalDisk");
			foreach ( ManagementObject objMgmt in objCS.Get() )
			{
				device = objMgmt["DeviceID"];		// C:
				if (null !=device)
				{
					space = objMgmt["FreeSpace"];	// C:10.32 GB, D:5.87GB
					if (null!=space)
						diskSpace  = device.ToString()  FormatBytes(double.Parse(space.ToString()))  ", ";
				}
			}

			diskSpace =  diskSpace.Substring(0, diskSpace.Length-2);
			return diskSpace;
		}

		#endregion

		#region "Private Helpers"
		double GetCounterValue(PerformanceCounter pc, string categoryName, string counterName, string instanceName)
		{
			pc.CategoryName = categoryName;
			pc.CounterName = counterName;
			pc.InstanceName = instanceName;
			return pc.NextValue();	
		}

		#endregion

		#region "Members"
		bool _compactFormat;

		PerformanceCounter _memoryCounter = new PerformanceCounter();	
		PerformanceCounter _cpuCounter = new PerformanceCounter();	
		PerformanceCounter _diskReadCounter = new PerformanceCounter();	
		PerformanceCounter _diskWriteCounter = new PerformanceCounter();	

		string[] _instanceNames;
		PerformanceCounter[] _netRecvCounters;	
		PerformanceCounter[] _netSentCounters;	

		#endregion
	}

	public delegate void OnLogicalDiskProc(string s);
}