Bagikan melalui

Stream.CanRead Properti

  • Referensi

Definisi

Ruang nama:
System.IO
Rakitan:
System.IO.dll
Rakitan:
System.Runtime.dll
Rakitan:
mscorlib.dll
Rakitan:
netstandard.dll
Sumber:
Stream.cs
Sumber:
Stream.cs
Sumber:
Stream.cs

Saat ditimpa di kelas turunan, mendapatkan nilai yang menunjukkan apakah aliran saat ini mendukung pembacaan.

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

Nilai Properti

Boolean

true jika aliran mendukung pembacaan; jika tidak, false.

Contoh

Berikut ini adalah contoh penggunaan CanRead properti .

using namespace System;
using namespace System::IO;
int main( void )
{
   FileStream^ fs = gcnew FileStream( "MyFile.txt",FileMode::OpenOrCreate,FileAccess::Read );
   if ( fs->CanRead && fs->CanWrite )
   {
      Console::WriteLine( "MyFile.txt can be both written to and read from." );
   }
   else
   {
      Console::WriteLine( "MyFile.txt is not writable" );
   }

   return 0;
}

using System;
using System.IO;

class TestRW
{
    public static void Main(String[] args)
    {
        FileStream fs = new FileStream("MyFile.txt", FileMode.OpenOrCreate, FileAccess.Read);
        if (fs.CanRead && fs.CanWrite)
        {
            Console.WriteLine("MyFile.txt can be both written to and read from.");
        }
        else if (fs.CanRead)
        {
            Console.WriteLine("MyFile.txt is not writable.");
        }
    }
}

Imports System.IO

Class TestRW

    Public Shared Sub Main()
        Dim fs As New FileStream("MyFile.txt", FileMode.OpenOrCreate, FileAccess.Read)
        If fs.CanRead And fs.CanWrite Then
            Console.WriteLine("MyFile.txt can be both written to and read from.")
        Else
            If fs.CanRead Then
                Console.WriteLine("MyFile.txt is not writable.")
            End If
        End If
    End Sub
End Class

Keterangan

Jika kelas yang berasal dari Stream tidak mendukung pembacaan, panggilan ke Readmetode , ReadByte, dan BeginRead melemparkan NotSupportedException.

Berlaku untuk

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