问C# .Net6.0--如何通过C#更改Windows页面文件大小(虚拟内存)？

EN

<requestedExecutionLevel  level="asInvoker" uiAccess="false" />

<requestedExecutionLevel  level="requireAdministrator" uiAccess="false" />

public UInt64 GetTotalMemoryInMB()
{
    UInt64 totalPhysicalMemoryInBytes = 0;

    using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("Select Capacity from Win32_PhysicalMemory"))
    {
        foreach (ManagementObject obj in searcher.Get())
        {
            if (obj == null)
                continue;

            totalPhysicalMemoryInBytes += obj["Capacity"] is null ? 0 : Convert.ToUInt64(obj["Capacity"]);
        }
    }

    return totalPhysicalMemoryInBytes / 1024 / 1024;
}

public string SetPageFileWmi(uint initialSizePercentage, uint maximumSizePercentage)
{
    StringBuilder sb = new StringBuilder();

    //get Windows folder
    string? winDir = Environment.GetEnvironmentVariable("windir");

    //get drive letter that OS is installed on
    string winDriveLetter = winDir?.Substring(0, 2) is null ? String.Empty : winDir.Substring(0, 2); //ex: C:
    
    //get total physical memory
    UInt64 totalPhysicalMemory = GetTotalMemoryInMB();

    sb.AppendLine($"Total Physical Memory: {totalPhysicalMemory}");

    //calculate initial size
    UInt32 initialSize = Convert.ToUInt32(Math.Floor(totalPhysicalMemory * (initialSizePercentage / 100.0))); //ex: 20% / 100.0 = 0.2
    initialSize = initialSize < 16 ? 16 : initialSize; //initial size needs to be >= 16 MB

    //calculate maximum size
    UInt32 maximumSize = Convert.ToUInt32(Math.Floor(totalPhysicalMemory * (maximumSizePercentage / 100.0))); //ex: 50% / 100.0 = 0.5

    using (ManagementObject obj = new ManagementObject($@"ROOT\CIMV2:Win32_ComputerSystem.Name='{Environment.MachineName}'"))
    {
        //set value
        obj.SetPropertyValue("AutomaticManagedPagefile", false);

        //commit
        obj.Put(new PutOptions() { Type = PutType.UpdateOnly });
    }

    using (ManagementObjectSearcher searcher = new ManagementObjectSearcher("Select Name from Win32_PageFile"))
    {
        foreach (ManagementObject obj in searcher.Get())
        {
            string? pfName = obj["Name"]?.ToString();

            Debug.WriteLine($"pfName: '{pfName}'");

            //only get the page file for the OS drive
            if (!String.IsNullOrEmpty(pfName) && pfName.ToLower().StartsWith(winDriveLetter.ToLower()))
            {
                sb.AppendLine($"Name: {pfName}");
                sb.AppendLine($"InitialSize: {initialSize}");
                sb.AppendLine($"MaximumSize: {maximumSize}");
                sb.AppendLine("");

                using (ManagementObject obj2 = new ManagementObject($@"ROOT\CIMV2:Win32_PageFileSetting.Name='{pfName}'"))
                {
                    //set value
                    //obj2.SetPropertyValue("Name", pfName);
                    obj2.SetPropertyValue("InitialSize", initialSize);
                    obj2.SetPropertyValue("MaximumSize", maximumSize);

                    //commit
                    obj2.Put(new PutOptions() { Type = PutType.UpdateOrCreate });
                }
            }
        }
    }

    return sb.ToString();
}

string result = SetPageFileWmi(20, 50);

public static string SetPageFileDefaultWmi()
{
    using (ManagementObject obj = new ManagementObject($@"ROOT\CIMV2:Win32_ComputerSystem.Name='{Environment.MachineName}'"))
    {
        obj.SetPropertyValue("AutomaticManagedPagefile", true);
        obj.Put(new PutOptions() { Type = PutType.UpdateOnly });
    }

    return "Paging file set to default.";
}