c# - 各种 GetLogicalDrives 方法之间有什么区别，哪种方法更好用

Question

我试图获取硬盘驱动器的名称或盘符，但仍然一头雾水，因为这里有几个函数可以使用。下面三个获取硬盘盘符的代码有什么区别？哪个更好用？

Directory.GetLogicalDrives()
Environment.GetLogicalDrives()
DriveInfo.GetDrives()

结果:

Answer 1

他们都调用这段代码，这只是 Win32 API 的包装器 GetLogicalDrives function

new EnvironmentPermission(PermissionState.Unrestricted).Demand();

int drives = Win32Native.GetLogicalDrives();
if (drives == 0)
   __Error.WinIOError();
uint d = (uint)drives;
int count = 0;
while (d != 0)
{
   if (((int)d & 1) != 0) count++;
   d >>= 1;
}
String[] result = new String[count];
char[] root = new char[] { 'A', ':', '\\' };
d = (uint)drives;
count = 0;
while (d != 0)
{
   if (((int)d & 1) != 0)
   {
      result[count++] = new String(root);
   }
   d >>= 1;
   root[0]++;
}
return result;

异常(exception)情况是 GetDrives将结果传递给 DriveInfo类

// Directory.GetLogicalDrives demands unmanaged code permission
String[] drives = Directory.GetLogicalDrives();
DriveInfo[] di = new DriveInfo[drives.Length];
for(int i=0; i<drives.Length; i++)
     di[i] = new DriveInfo(drives[i]);
return di;

所以答案是，没有明显的差异

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引用文献

• Reference source Directory.GetLogicalDrives()

• Reference source Environment.GetLogicalDrives()

• Reference source DriveInfo.GetDrives()