DriveInfo.IsReady プロパティ

定義

ドライブの準備ができているかどうかを示す値を取得します。Gets a value that indicates whether a drive is ready.

public:
 property bool IsReady { bool get(); };
public bool IsReady { get; }
member this.IsReady : bool
Public ReadOnly Property IsReady As Boolean

プロパティ値

Boolean

ドライブの準備ができている場合は true。ドライブの準備ができていない場合は falsetrue if the drive is ready; false if the drive is not ready.

次のコード例は、クラスを使用して、 DriveInfo 現在のシステム上のすべてのドライブに関する情報を表示する方法を示しています。The following code example demonstrates the use of the DriveInfo class to display information about all of the drives on the current system.

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.
*/
Imports System.IO

Class Test
    Public Shared Sub Main()
        Dim allDrives() As DriveInfo = DriveInfo.GetDrives()

        Dim d As DriveInfo
        For Each d In allDrives
            Console.WriteLine("Drive {0}", d.Name)
            Console.WriteLine("  Drive type: {0}", d.DriveType)
            If d.IsReady = True Then
                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)
            End If
        Next
    End Sub
End Class
'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.

注釈

IsReady ドライブの準備ができているかどうかを示します。IsReady indicates whether a drive is ready. たとえば、CD が CD ドライブにあるかどうか、またはリムーバブル記憶装置の読み取り/書き込み操作の準備ができているかどうかを示します。For example, it indicates whether a CD is in a CD drive or whether a removable storage device is ready for read/write operations. ドライブの準備ができていて、準備ができていないかどうかをテストしない場合、を使用してドライブにクエリを実行すると DriveInfo 、が発生 IOException します。If you do not test whether a drive is ready, and it is not ready, querying the drive using DriveInfo will raise an IOException.

、、など IsReady の他のメンバーからの例外がキャッチされないように、に依存しないでください TotalSize TotalFreeSpace DriveFormatDo not rely on IsReady to avoid catching exceptions from other members such as TotalSize, TotalFreeSpace, and DriveFormat. コードによって確認 IsReady され、他のプロパティの1つにアクセスするまでの間 (チェックの直後にアクセスが発生した場合でも)、ドライブが切断されているか、ディスクが削除された可能性があります。Between the time that your code checks IsReady and then accesses one of the other properties (even if the access occurs immediately after the check), a drive may have been disconnected or a disk may have been removed.

適用対象