使用英语阅读

通过

DriveInfo.TotalFreeSpace 属性

  • 参考

定义

命名空间:
System.IO
程序集:
System.IO.FileSystem.DriveInfo.dll
程序集:
mscorlib.dll
程序集:
netstandard.dll
Source:
DriveInfo.Unix.cs
Source:
DriveInfo.Unix.cs
Source:
DriveInfo.Unix.cs

获取驱动器上的可用空闲空间总量（以字节为单位）。

public long TotalFreeSpace { get; }

属性值

Int64

驱动器上的可用空闲空间总量（以字节为单位）。

例外

UnauthorizedAccessException

拒绝访问驱动器信息。

DriveNotFoundException

该驱动器未映射或不存在。

IOException

发生了 I/O 错误（例如，磁盘错误或驱动器未准备好）。

示例

下面的代码示例演示如何使用 DriveInfo 类来显示有关当前系统上所有驱动器的信息。

using System;
using System.IO;

class Test
{
    public static void Main()
    {
        DriveInfo[] allDrives = DriveInfo.GetDrives();

        foreach (DriveInfo d in allDrives)
        {
            Console.WriteLine("Drive {0}", d.Name);
            Console.WriteLine("  Drive type: {0}", d.DriveType);
            if (d.IsReady == true)
            {
                Console.WriteLine("  Volume label: {0}", d.VolumeLabel);
                Console.WriteLine("  File system: {0}", d.DriveFormat);
                Console.WriteLine(
                    "  Available space to current user:{0, 15} bytes",
                    d.AvailableFreeSpace);

                Console.WriteLine(
                    "  Total available space:          {0, 15} bytes",
                    d.TotalFreeSpace);

                Console.WriteLine(
                    "  Total size of drive:            {0, 15} bytes ",
                    d.TotalSize);
            }
        }
    }
}
/*
This code produces output similar to the following:

Drive A:\
  Drive type: Removable
Drive C:\
  Drive type: Fixed
  Volume label:
  File system: FAT32
  Available space to current user:     4770430976 bytes
  Total available space:               4770430976 bytes
  Total size of drive:                10731683840 bytes
Drive D:\
  Drive type: Fixed
  Volume label:
  File system: NTFS
  Available space to current user:    15114977280 bytes
  Total available space:              15114977280 bytes
  Total size of drive:                25958948864 bytes
Drive E:\
  Drive type: CDRom

The actual output of this code will vary based on machine and the permissions
granted to the user executing it.
*/

注解

此属性指示驱动器上可用的总可用空间量，而不仅仅是当前用户可用的可用空间。

适用于

产品 版本
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1