C#操作实例总结（一）—— 系统操作

1.1 判断本机是否联网

if(SystemInformation.Network)
{
    //联网状态
}
else
{
    //未联网状态
}

1.2 获取特殊文件路径

1.2.1 获取Program Files路径

string FilePath = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles);

1.2.2 获取桌面目录路径

string FilePath = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);

1.2.3 获取开始菜单路径

string Filepath = Environment.GetFolderPath(Environment.SpecialFolder.StartMenu);

1.2.4 获取用户程序组路径

string Filepath = Environment.GetFolderPath(Environment.SpecialFolder.Programs);

1.2.5 获取文档模板路径

string Filepath = Environment.GetFolderPath(Environment.SpecialFolder.Templates);

1.2.6 获取收藏夹路径

string Filepath = Environment.GetFolderPath(Environment.SpecialFolder.Favorites);

1.2.7 获取共享组件路径

string Filepath = Environment.GetFolderPath(Environment.SpecialFolder.CommonProgramFiles);

1.2.8 获取我的图片路径

string Filepath = Environment.GetFolderPath(Environment.SpecialFolder.MyPictures);

1.2.9 获取Internet历史记录路径

string Filepath = Environment.GetFolderPath(Environment.SpecialFolder.History);

1.2.10 获取Internet临时文件路径

string Filepath = Environment.GetFolderPath(Environment.SpecialFolder.InternetCache);

1.3 剪切板内容处理

//设置剪切板内容
Clipboard.SetText("将此字符串置于剪切板中");

//获得剪切板内容
string ClipBoardMsg = Clipboard.GetText();

1.4 获取本机内网IP

string str = "";
//获取IP地址列表
System.Net.IPAddress[] addressList = System.Net.Dns.GetHostByName(System.Net.Dns.GetHostName()).AddressList;
//遍历IP地址列表
for (int i = 0; i < addressList.Length; i++)
{
    //获得遍历到的IP地址
    str+= addressList[i].ToString() + "\n";
}
//str就是本机内网ip

1.5 获取本机公网IP

/// <summary>
/// 获得本机公网IP
/// </summary>
/// <returns>获取不到则返回空串</returns>
private static string GetIP()
{
    string tempip = "";
    try
    {
        WebRequest wr = WebRequest.Create("http://www.ip138.com/ips138.asp");
        Stream s = wr.GetResponse().GetResponseStream();
        StreamReader sr = new StreamReader(s, Encoding.Default);
        string all = sr.ReadToEnd(); //读取网站的数据

        int start = all.IndexOf("您的IP地址是：[") + 9;
        int end = all.IndexOf("]", start);
        tempip = all.Substring(start, end - start);
        sr.Close();
        s.Close();
    }
    catch
    {
    }
    return tempip;
}

1.6 更改屏幕分辨率

[DllImport("user32.dll", CharSet = CharSet.Auto)]
static extern int ChangeDisplaySettings([In] ref DEVMODE lpDevMode, int dwFlags);

public enum DMDO
{
    DEFAULT = 0,
    D90 = 1,
    D180 = 2,
    D270 = 3
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
struct DEVMODE
{
    public const int DM_DISPLAYFREQUENCY = 0x400000;
    public const int DM_PELSWIDTH = 0x80000;
    public const int DM_PELSHEIGHT = 0x100000;
    public const int DM_BITSPERPEL = 262144;
    private const int CCHDEVICENAME = 32;
    private const int CCHFORMNAME = 32;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHDEVICENAME)]
    public string dmDeviceName;
    public short dmSpecVersion;
    public short dmDriverVersion;
    public short dmSize;
    public short dmDriverExtra;
    public int dmFields;
    public int dmPositionX;
    public int dmPositionY;
    public DMDO dmDisplayOrientation;
    public int dmDisplayFixedOutput;
    public short dmColor;
    public short dmDuplex;
    public short dmYResolution;
    public short dmTTOption;
    public short dmCollate;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHFORMNAME)]
    public string dmFormName;
    public short dmLogPixels;
    public int dmBitsPerPel;
    public int dmPelsWidth;
    public int dmPelsHeight;
    public int dmDisplayFlags;
    public int dmDisplayFrequency;
    public int dmICMMethod;
    public int dmICMIntent;
    public int dmMediaType;
    public int dmDitherType;
    public int dmReserved1;
    public int dmReserved2;
    public int dmPanningWidth;
    public int dmPanningHeight;
}

//****************************调用***************************

long RetVal = 0;
DEVMODE dm = new DEVMODE();
dm.dmSize = (short)Marshal.SizeOf(typeof(DEVMODE));
dm.dmPelsWidth = 1024;//宽
dm.dmPelsHeight = 768;//高
dm.dmDisplayFrequency = 60;//刷新率
dm.dmFields = DEVMODE.DM_PELSWIDTH | DEVMODE.DM_PELSHEIGHT | DEVMODE.DM_DISPLAYFREQUENCY | DEVMODE.DM_BITSPERPEL;
RetVal = ChangeDisplaySettings(ref dm, 0);

1.7 机器码相关

/// <summary>
/// 获取CPU序列号
/// </summary>
/// <returns>CPU序列号字符串</returns>
private static string GetCpuInfo()
{
    try
    {
        string cpuInfo = "";
        ManagementClass cimobject = new ManagementClass("Win32_Processor");
        ManagementObjectCollection moc = cimobject.GetInstances();
        foreach (ManagementObject mo in moc)
        {
            cpuInfo += mo.Properties["ProcessorId"].Value.ToString();
        }
        return cpuInfo.ToString();
    }
    catch
    {
        return "unknown";
    }
}

/// <summary>
/// 获取硬盘ID
/// </summary>
/// <returns>string</returns>
private static string GetHardDiskID()
{
    try
    {
        ManagementClass mcHD = new ManagementClass("win32_logicaldisk");
        ManagementObjectCollection mocHD = mcHD.GetInstances();
        foreach (ManagementObject m in mocHD)
        {
            if (m["DeviceID"].ToString() == "C:")
            {
                return m["VolumeSerialNumber"].ToString();
            }
        }
        return "";
    }
    catch
    {
        return "unknown";
    }
}

/// <summary>
/// 获取网卡的物理地址
/// </summary>
/// <returns></returns>
private static string GetMacAddress()
{
    try
    {
        string mac = "";
        ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
        ManagementObjectCollection moc = mc.GetInstances();
        foreach (ManagementObject mo in moc)
        {
            if ((bool)mo["IPEnabled"] == true)
            {
                mac += mo["MacAddress"].ToString();
            }
        }
        moc = null;
        mc = null;
        return mac;
    }
    catch
    {
        return "unknown";
    }
}

/// <summary>
/// 获取网卡的IP地址
/// </summary>
/// <returns></returns>
private static string GetIPAddress()
{
    try
    {
        //获取IP地址
        string st = "";
        ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
        ManagementObjectCollection moc = mc.GetInstances();
        foreach (ManagementObject mo in moc)
        {
            if ((bool)mo["IPEnabled"] == true)
            {
                System.Array ar;
                ar = (System.Array)(mo.Properties["IpAddress"].Value);
                st += ar.GetValue(0).ToString();
            }
        }
        moc = null;
        mc = null;
        return st;
    }
    catch
    {
        return "unknow";
    }
    finally
    {
    }
}

1.8 注销、关机、重启

[DllImport("user32.dll", EntryPoint = "ExitWindowsEx", CharSet = CharSet.Ansi)]
private static extern int ExitWindowsEx(int uFlags, int dwReserved);
//注销计算机
ExitWindowsEx(0, 0);

//关机
System.Diagnostics.Process myProcess = new System.Diagnostics.Process();
myProcess.StartInfo.FileName = "cmd.exe";//启动cmd命令
myProcess.StartInfo.UseShellExecute = false;//是否使用系统外壳程序启动进程
myProcess.StartInfo.RedirectStandardInput = true;//是否从流中读取
myProcess.StartInfo.RedirectStandardOutput = true;//是否写入流
myProcess.StartInfo.RedirectStandardError = true;//是否将错误信息写入流
myProcess.StartInfo.CreateNoWindow = true;//是否在新窗口中启动进程
myProcess.Start();//启动进程
myProcess.StandardInput.WriteLine("shutdown -s -t 0");//执行关机命令

//重启
System.Diagnostics.Process myProcess = new System.Diagnostics.Process();
myProcess.StartInfo.FileName = "cmd.exe";//启动cmd命令
myProcess.StartInfo.UseShellExecute = false;//是否使用系统外壳程序启动进程
myProcess.StartInfo.RedirectStandardInput = true;//是否从流中读取
myProcess.StartInfo.RedirectStandardOutput = true;//是否写入流
myProcess.StartInfo.RedirectStandardError = true;//是否将错误信息写入流
myProcess.StartInfo.CreateNoWindow = true;//是否在新窗口中启动进程
myProcess.Start();//启动进程
myProcess.StandardInput.WriteLine("shutdown -r -t 0");//执行重启计算机命令

1.9 获取内存使用情况

//需要添加引用 Microsoft.VisualBasic
using Microsoft.VisualBasic.Devices;

//获得内存使用情况
Computer myComputer = new Computer();

//获取系统的物理内存总量
string MemoryMsg = Convert.ToString(myComputer.Info.TotalPhysicalMemory / 1024 / 1024);

//获取系统的可用物理内存
string MemoryMsg = Convert.ToString(myComputer.Info.AvailablePhysicalMemory / 1024 / 1024);

//获取系统的虚拟内存总量
string MemoryMsg = Convert.ToString(myComputer.Info.TotalVirtualMemory / 1024 / 1024);

//获取系统的可用虚拟内存
string MemoryMsg = Convert.ToString(myComputer.Info.AvailableVirtualMemory / 1024 / 1024);

1.10 获取当前屏幕分辨率

//宽
int ScreenWidth = SystemInformation.VirtualScreen.Width;

//高
int ScreenHeight = SystemInformation.VirtualScreen.Height;

1.11 获取当前程序运行目录

string AppPath = Environment.CurrentDirectory;

1.12获取磁盘空间使用情况

try
{
    System.IO.DriveInfo[] drive = System.IO.DriveInfo.GetDrives();//获取所有驱动器
    for (int i = 0; i < drive.Length; i++)//遍历驱动器
    {
        Console.WriteLine(drive[i].Name + ": 总空间：" + drive[i].TotalSize / 1024 / 1024 / 1024 + "G");//显示总空间
        Console.WriteLine(drive[i].Name + ": 剩余空间：" + drive[i].TotalFreeSpace / 1024 / 1024 / 1024 + "G");//显示剩余空间
        Console.WriteLine(drive[i].Name + ": 已用空间：" + (drive[i].TotalSize - drive[i].TotalFreeSpace) / 1024 / 1024 / 1024 + "G");//显示已用空间
    }
}
catch { }

1.13 获取系统启动后持续运行的时间

string TickCont = (Environment.TickCount / 1000).ToString() + "秒";

1.14 获取计算机名称

string MechineName = Environment.MachineName;

1.14 操作蜂鸣器

protected enum Tone//枚举 五线谱
{
    REST = 0,
    A = 220,
    B = 247,
    C = 262,
    D = 294,
    E = 330,
    F = 349,
    G = 392,
}

protected enum Duration//枚举 发音时间
{
    WHOLE = 1200,
    HALF = WHOLE / 2,
    QUARTER = HALF / 2,
    EIGHTH = QUARTER / 2,
    SIXTEENTH = EIGHTH / 2,
}

protected struct Note
{
    Tone toneVal;  //初始化一个Tone对象
    Duration durVal;  //初始化一个Duration对象
    public Note(Tone frequency, Duration time)  //定义一个Note方法
    {
        toneVal = frequency;  //为变量toneVal赋值
        durVal = time;  //为变量durVal赋值
    }
    public Tone NoteTone
    {
        get
        {
            return toneVal;    //定义一个Tone类型的属性
        }
        set
        {
            toneVal = value;
        }
    }
    public Duration NoteDuration
    {
        get
        {
            return durVal;    //定义一个Duration类型的属性
        }
        set
        {
            durVal = value;
        }
    }
}

protected void Play(Note tune)
{
    if (tune.NoteTone == Tone.REST)  //当没有选择RadioButton按钮时
        Thread.Sleep((int)tune.NoteDuration);  //将当前线程挂起指定的时间
    else //当选定某一个RadioButton按钮时
        //通过控制台扬声器播放具有指定频率和持续时间的声音
        Console.Beep((int)tune.NoteTone, (int)tune.NoteDuration);
}

/// <summary>
/// 发音方法
/// </summary>
/// <param name="a">1 - 7 音</param>
/// <param name="b">声调 1长音 2中长音 3中音 4短长音 5短音</param>
private void PlayMic(int a, int b)
{
    Note note = new Note();
    switch (a)
    {
    case 1:
        note.NoteTone = Tone.A;
        break;
    case 2:
        note.NoteTone = Tone.B;
        break;
    case 3:
        note.NoteTone = Tone.C;
        break;
    case 4:
        note.NoteTone = Tone.D;
        break;
    case 5:
        note.NoteTone = Tone.E;
        break;
    case 6:
        note.NoteTone = Tone.F;
        break;
    case 7:
        note.NoteTone = Tone.G;
        break;
    default:
        break;
    }
    switch (b)
    {
    case 1:
        note.NoteDuration = Duration.WHOLE;
        break;
    case 2:
        note.NoteDuration = Duration.HALF;
        break;
    case 3:
        note.NoteDuration = Duration.QUARTER;
        break;
    case 4:
        note.NoteDuration = Duration.EIGHTH;
        break;
    case 5:
        note.NoteDuration = Duration.SIXTEENTH;
        break;
    }
    Play(note);
}


//****************************调用***************************


PlayMic(1, 1);

PlayMic(2, 1);

PlayMic(3, 1);

PlayMic(4, 1);

PlayMic(5, 1);

PlayMic(6, 1);

PlayMic(7, 1);