get system total memory in csharp

main.cs
using System.Diagnostics;

// ...

// Create a PerformanceCounter object for the Available Bytes counter
var pc = new PerformanceCounter("Memory", "Available Bytes");

// Get the current available memory in bytes
long availableMemory = pc.RawValue;

Console.WriteLine($"Available memory: {availableMemory} bytes");
315 chars
12 lines

main.cs
using System.Management;

// ...

// Select the "TotalPhysicalMemory" property from the "Win32_ComputerSystem" class
var searcher = new ManagementObjectSearcher("SELECT TotalPhysicalMemory FROM Win32_ComputerSystem");
var result = searcher.Get().Cast<ManagementObject>().FirstOrDefault();

// Get the total physical memory in bytes
long totalMemory = result == null ? 0 : (long)result["TotalPhysicalMemory"];

Console.WriteLine($"Total memory: {totalMemory} bytes");
467 chars
13 lines