C#获取当前系统内存剩余百分比

static class Program

{

    [StructLayout(LayoutKind.Sequential)]
    public struct MemoryInfo
    {
        public uint Length;
        public uint MemoryLoad;
        public ulong TotalPhysical;//总内存
        public ulong AvailablePhysical;//可用物理内存
        public ulong TotalPageFile;
        public ulong AvailablePageFile;
        public ulong TotalVirtual;
        public ulong AvailableVirtual;
    }

    [DllImport("kernel32")]
    public static extern void GlobalMemoryStatus(ref MemoryInfo meminfo);

    static void Main()
        {
            MemoryInfo MemInfo = new MemoryInfo();
            GlobalMemoryStatus(ref MemInfo);

            double totalMb = MemInfo.TotalPhysical / 1024 / 1024;
            double avaliableMb = MemInfo.AvailablePhysical / 1024 / 1024;

            Console.WriteLine($"物理内存共有:{totalMb}MB");
            Console.WriteLine($"可使用的物理内存:{avaliableMb}MB");
            Console.WriteLine($"剩余内存百分比：{Math.Round((avaliableMb / totalMb) * 100, 2)}");

        }

}

API GlobalMemoryStatus获取内存信息，但该方法参数长度在32位和64位系统下不同，如定义错误拿不到正确值，区别如下：

//32位
public struct MemoryInfo
    {
        public uint Length;
        public uint MemoryLoad;
        public ulong TotalPhysical;//总内存
        public ulong AvailablePhysical;//可用物理内存
        public ulong TotalPageFile;
        public ulong AvailablePageFile;
        public ulong TotalVirtual;
        public ulong AvailableVirtual;
    }

//64位
public struct MemoryInfo
    {
        public uint Length;
        public uint MemoryLoad;
        public uint TotalPhysical;//总内存
        public uint AvailablePhysical;//可用物理内存
        public uint TotalPageFile;
        public uint AvailablePageFile;
        public uint TotalVirtual;
        public uint AvailableVirtual;
    }