C#获取特定进程CPU和内存使用率
首先是获取特定进程对象，可以使用Process.GetProcesses()方法来获取系统中运行的所有进程，或者使用Process.GetCurrentProcess()方法来获取当前程序所对应的进程对象。当有了进程对象后，可以通过进程对象名称来创建PerformanceCounter类型对象，通过设定PerformanceCounter构造函数的参数实现获取特定进程的CPU和内存使用情况。
具体实例代码如下：
首先是获取本机中所有进程对象，分别输出某一时刻各个进程的内存使用情况：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Diagnostics; 6 using System.Threading; 7 8 namespace CSharpPerformance 9 {//该程序可以实时监控所有进程或者指定进程的工作集、私有工作集 10 class Program 11 { 12 static void Main(string[] args) 13 { 14 //新建一个Stopwatch变量用来统计程序运行时间 15 Stopwatch watch = Stopwatch.StartNew(); 16 //获取本机运行的所有进程ID和进程名,并输出哥进程所使用的工作集和私有工作集 17 foreach (Process ps in Process.GetProcesses()) 18 { 19 PerformanceCounter pf1 = new PerformanceCounter("Process", "Working Set - Private", ps.ProcessName); 20 PerformanceCounter pf2 = new PerformanceCounter("Process", "Working Set", ps.ProcessName); 21 Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "工作集(进程类)", ps.WorkingSet64 / 1024); 22 Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "工作集 ", pf2.NextValue() / 1024); 23 //私有工作集 24 Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "私有工作集 ", pf1.NextValue() / 1024); 25 26 } 27 28 watch.Stop(); 29 Console.WriteLine(watch.Elapsed); 30 Console.ReadLine(); 31 } 32 } 33 }
其中，工作集ps.WorkingSet64是静态的，pf2.NextValue()是动态变化的，工作集包含进程运行时其独占的内存和与其他进程共享的内存的和，而私有工作集是只包含进程独占的内存。
下面一组代码可以动态显示本程序所对应的进程的CPU和内存使用率的变化：
首先是SystemInfo.cs类：
1 using System; 2 using System.Collections.Generic; 3 using System.Diagnostics; 4 using System.Threading; 5 using System.IO; 6 using System.Text; 7 using System.Management; 8 using System.Runtime.InteropServices; 9 10 namespace CSharpPerformance 11 { 12 public class SystemInfo 13 { 14 private int m_ProcessorCount = 0; //CPU个数 15 private PerformanceCounter pcCpuLoad; //CPU计数器 16 private long m_PhysicalMemory = 0; //物理内存 17 18 private const int GW_HWNDFIRST = 0; 19 private const int GW_HWNDNEXT = 2; 20 private const int GWL_STYLE = (-16); 21 private const int WS_VISIBLE = 268435456; 22 private const int WS_BORDER = 8388608; 23 24 #region AIP声明 25 [DllImport("IpHlpApi.dll")] 26 extern static public uint GetIfTable(byte[] pIfTable, ref uint pdwSize, bool bOrder); 27 28 [DllImport("User32")] 29 private extern static int GetWindow(int hWnd, int wCmd); 30 31 [DllImport("User32")] 32 private extern static int GetWindowLongA(int hWnd, int wIndx); 33 34 [DllImport("user32.dll")] 35 private static extern bool GetWindowText(int hWnd, StringBuilder title, int maxBufSize); 36 37 [DllImport("user32", CharSet = CharSet.Auto)] 38 private extern static int GetWindowTextLength(IntPtr hWnd); 39 #endregion 40 41 #region 构造函数 42 /// <summary> 43 /// 构造函数，初始化计数器等 44 /// </summary> 45 public SystemInfo() 46 { 47 //初始化CPU计数器 48 pcCpuLoad = new PerformanceCounter("Processor", "% Processor Time", "_Total"); 49 pcCpuLoad.MachineName = "."; 50 pcCpuLoad.NextValue(); 51 52 //CPU个数 53 m_ProcessorCount = Environment.ProcessorCount; 54 55 //获得物理内存 56 ManagementClass mc = new ManagementClass("Win32_ComputerSystem"); 57 ManagementObjectCollection moc = mc.GetInstances(); 58 foreach (ManagementObject mo in moc) 59 { 60 if (mo["TotalPhysicalMemory"] != null) 61 { 62 m_PhysicalMemory = long.Parse(mo["TotalPhysicalMemory"].ToString()); 63 } 64 } 65 } 66 #endregion 67 68 #region CPU个数 69 /// <summary> 70 /// 获取CPU个数 71 /// </summary> 72 public int ProcessorCount 73 { 74 get 75 { 76 return m_ProcessorCount; 77 } 78 } 79 #endregion 80 81 #region CPU占用率 82 /// <summary> 83 /// 获取CPU占用率 84 /// </summary> 85 public float CpuLoad 86 { 87 get 88 { 89 return pcCpuLoad.NextValue(); 90 } 91 } 92 #endregion 93 94 #region 可用内存 95 /// <summary> 96 /// 获取可用内存 97 /// </summary> 98 public long MemoryAvailable 99 { 100 get 101 { 102 long availablebytes = 0; 103 //ManagementObjectSearcher mos = new ManagementObjectSearcher("SELECT * FROM Win32_PerfRawData_PerfOS_Memory"); 104 //foreach (ManagementObject mo in mos.Get()) 105 //{ 106 // availablebytes = long.Parse(mo["Availablebytes"].ToString()); 107 //} 108 ManagementClass mos = new ManagementClass("Win32_OperatingSystem"); 109 foreach (ManagementObject mo in mos.GetInstances()) 110 { 111 if (mo["FreePhysicalMemory"] != null) 112 { 113 availablebytes = 1024 * long.Parse(mo["FreePhysicalMemory"].ToString()); 114 } 115 } 116 return availablebytes; 117 } 118 } 119 #endregion 120 121 #region 物理内存 122 /// <summary> 123 /// 获取物理内存 124 /// </summary> 125 public long PhysicalMemory 126 { 127 get 128 { 129 return m_PhysicalMemory; 130 } 131 } 132 #endregion 133 134 #region 结束指定进程 135 /// <summary> 136 /// 结束指定进程 137 /// </summary> 138 /// <param name="pid">进程的 Process ID</param> 139 public static void EndProcess(int pid) 140 { 141 try 142 { 143 Process process = Process.GetProcessById(pid); 144 process.Kill(); 145 } 146 catch { } 147 } 148 #endregion 149 150 151 #region 查找所有应用程序标题 152 /// <summary> 153 /// 查找所有应用程序标题 154 /// </summary> 155 /// <returns>应用程序标题范型</returns> 156 public static List<string> FindAllApps(int Handle) 157 { 158 List<string> Apps = new List<string>(); 159 160 int hwCurr; 161 hwCurr = GetWindow(Handle, GW_HWNDFIRST); 162 163 while (hwCurr > 0) 164 { 165 int IsTask = (WS_VISIBLE | WS_BORDER); 166 int lngStyle = GetWindowLongA(hwCurr, GWL_STYLE); 167 bool TaskWindow = ((lngStyle & IsTask) == IsTask); 168 if (TaskWindow) 169 { 170 int length = GetWindowTextLength(new IntPtr(hwCurr)); 171 StringBuilder sb = new StringBuilder(2 * length + 1); 172 GetWindowText(hwCurr, sb, sb.Capacity); 173 string strTitle = sb.ToString(); 174 if (!string.IsNullOrEmpty(strTitle)) 175 { 176 Apps.Add(strTitle); 177 } 178 } 179 hwCurr = GetWindow(hwCurr, GW_HWNDNEXT); 180 } 181 182 return Apps; 183 } 184 #endregion 185 } 186 }
然后是执行代码：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Diagnostics; 6 using System.Threading; 7 8 namespace CSharpPerformance 9 {//该程序可以实时监控程序本身对应进程的工作集、私有工作集和CPU使用率 10 class Program 11 { 12 static void Main(string[] args) 13 { 14 //获取当前进程对象 15 Process cur = Process.GetCurrentProcess(); 16 17 PerformanceCounter curpcp = new PerformanceCounter("Process", "Working Set - Private", cur.ProcessName); 18 PerformanceCounter curpc = new PerformanceCounter("Process", "Working Set", cur.ProcessName); 19 PerformanceCounter curtime = new PerformanceCounter("Process", "% Processor Time", cur.ProcessName); 20 21 //上次记录CPU的时间 22 TimeSpan prevCpuTime = TimeSpan.Zero; 23 //Sleep的时间间隔 24 int interval = 1000; 25 26 PerformanceCounter totalcpu = new PerformanceCounter("Processor", "% Processor Time", "_Total"); 27 28 SystemInfo sys = new SystemInfo(); 29 const int KB_DIV = 1024; 30 const int MB_DIV = 1024 * 1024; 31 const int GB_DIV = 1024 * 1024 * 1024; 32 while (true) 33 { 34 //第一种方法计算CPU使用率 35 //当前时间 36 TimeSpan curCpuTime = cur.TotalProcessorTime; 37 //计算 38 double value = (curCpuTime - prevCpuTime).TotalMilliseconds / interval / Environment.ProcessorCount * 100; 39 prevCpuTime = curCpuTime; 40 41 Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}", cur.ProcessName, "工作集(进程类)", cur.WorkingSet64 / 1024,value);//这个工作集只是在一开始初始化，后期不变 42 Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}", cur.ProcessName, "工作集 ", curpc.NextValue() / 1024,value);//这个工作集是动态更新的 43 //第二种计算CPU使用率的方法 44 Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}%", cur.ProcessName, "私有工作集 ", curpcp.NextValue() / 1024,curtime.NextValue()/Environment.ProcessorCount); 45 //Thread.Sleep(interval); 46 47 //第一种方法获取系统CPU使用情况 48 Console.Write("\r系统CPU使用率：{0}%", totalcpu.NextValue()); 49 //Thread.Sleep(interval); 50 51 //第二章方法获取系统CPU和内存使用情况 52 Console.Write("\r系统CPU使用率：{0}%，系统内存使用大小：{1}MB({2}GB)", sys.CpuLoad, (sys.PhysicalMemory - sys.MemoryAvailable) / MB_DIV, (sys.PhysicalMemory - sys.MemoryAvailable) / (double)GB_DIV); 53 Thread.Sleep(interval); 54 } 55 56 Console.ReadLine(); 57 } 58 } 59 }
以上程序可以正常运行，没隔1S刷新一次，实现动态显示本程序对应进程的CPU和内存使用情况。
