SetProcessWorkingSetSize减少内存占用

[DllImport("kernel32.dll", EntryPoint = "SetProcessWorkingSetSize")]

public static extern int SetProcessWorkingSetSize(IntPtr process, int minSize, int maxSize);

/// <summary>

/// 释放内存

/// </summary>

public static void ClearMemory()

{
     GC.Collect();
     GC.WaitForPendingFinalizers();
     if (Environment.OSVersion.Platform == PlatformID.Win32NT)
     {
         SetProcessWorkingSetSize(Process.GetCurrentProcess().Handle, -1, -1);
     }

}
如何获取当前应用占用的内存大小：
/// <summary>

/// 释放内存

/// </summary>

public static void ClearMemory()

{
     //获得当前工作进程
     Process proc = Process.GetCurrentProcess();
     long usedMemory = proc.PrivateMemorySize64;
     if (usedMemory > 1024 * 1024 * 20)
     {
         GC.Collect();
         GC.WaitForPendingFinalizers();
         if (Environment.OSVersion.Platform == PlatformID.Win32NT)
         {
             SetProcessWorkingSetSize(Process.GetCurrentProcess().Handle, -1, -1);
         }
     }

}