C#DriveInfo类，Path类

DriveInfo类

DriveInfo类用于获取有关驱动器（如硬盘驱动器、软盘驱动器、CD-ROM 驱动器等）的信息。

// 获取所有逻辑驱动器的信息   Drive驱动
DriveInfo[] drives = DriveInfo.GetDrives();

foreach (DriveInfo drive in drives)
{
    Console.WriteLine($"Drive: {drive.Name}");  // 驱动名称
    Console.WriteLine($"  Volume Label: {drive.VolumeLabel}");  // 卷标
    Console.WriteLine($"  Type: {drive.DriveType}");  // 驱动类型
    Console.WriteLine($"  Available Space: {drive.AvailableFreeSpace / 1024 / 1024/ 1024} bytes");// 可用空间
    Console.WriteLine($"  Total Size: {drive.TotalSize / 1024 / 1024 / 1024} bytes");  // 总空间
    Console.WriteLine($"  IsReady: {drive.IsReady}");// 磁盘是否准备好
    Console.WriteLine($"  Root Directory: {drive.RootDirectory.Name}");//盘符
}

DriveInfo info = new DriveInfo("D");
Console.WriteLine(info.AvailableFreeSpace/ 1024 / 1024 / 1024D);

Path类

Path类提供了用于处理文件和目录路径的静态方法。

// 目录===文件夹，路径
// DirectorySeparatorChar  目录分割符有两种：/  \，其中\默认的，
Console.WriteLine($"Path.DirectorySeparatorChar: '{Path.DirectorySeparatorChar}'");

// Alternate可选，可切换  分割符/
Console.WriteLine($"Path.AltDirectorySeparatorChar: '{Path.AltDirectorySeparatorChar}'");

// 多个路径之间分割符，是英文的分号;
Console.WriteLine($"Path.PathSeparator: '{Path.PathSeparator}'");

// 规律：方法带s结尾基本上集合    Invalid非法字符
var invalidChars = Path.GetInvalidPathChars();
string str = string.Empty;
foreach (char c in invalidChars)
{
    str += c.ToString();
}
Console.WriteLine(str);

// Volume卷标，盘符，分割符英文:
Console.WriteLine($"Path.VolumeSeparatorChar: '{Path.VolumeSeparatorChar}'");

// 注意：最后一个英文点后面的才是后缀名（扩展名）
string goodFileName = @"C:\mydir\myfile.com.extension";
string result = Path.ChangeExtension(goodFileName, ".old");
Console.WriteLine("ChangeExtension({0}, '.old') returns '{1}'",
    goodFileName, result);

// 拿扩展名，注意：取扩展名时，包含英文点
Console.WriteLine(Path.GetExtension(goodFileName));  // .extension

string[] pathArr = goodFileName.Split(new char[] { '.' });
string ext = pathArr[pathArr.Length - 1];
Console.WriteLine(ext);// 不带英文.

// 路径拼接，合并   Combine合并
// d:\archives\2001\media\images\a.jpg
string[] paths = { @"d:\archives", "2001", "media", "images", "a.jpg" };
string fullPath = Path.Combine(paths);
Console.WriteLine(fullPath);

// GetDirectoryName获取路径的目录部分
Console.WriteLine(Path.GetDirectoryName(goodFileName));
Console.WriteLine(Path.GetDirectoryName(fullPath));
// 取路径中的文件部分
Console.WriteLine(Path.GetFileName(fullPath));
Console.WriteLine(Path.GetFileName(@"D:\abc"));
Console.WriteLine(Path.GetFileNameWithoutExtension(fullPath)); // a

Console.WriteLine(Path.GetFullPath(fullPath));

char[] chars = Path.GetInvalidFileNameChars();
Console.WriteLine(string.Join("-", chars));

Console.WriteLine(Path.GetPathRoot(fullPath));

Console.WriteLine(Path.GetRandomFileName());
Console.WriteLine(Path.GetRandomFileName());

// 随机生成一个txt文件，要求：还上时间戳

string randomString = Path.GetRandomFileName();
string fileName = randomString.Split(new char[] { '.' })[0];
string tick = DateTime.Now.Ticks.ToString();
string fullFileName = $"{tick}-{fileName}.txt";
Console.WriteLine(fullFileName);

Console.WriteLine($"{tick}-{Path.ChangeExtension(randomString, ".txt")}");

// C:\Users\XXXX\AppData\Local\Temp
Console.WriteLine(Path.GetTempFileName());
Console.WriteLine(Path.GetTempFileName());