FileStream.CanRead Property

 

Gets a value indicating whether the current stream supports reading.

Namespace:   System.IO
Assembly:  mscorlib (in mscorlib.dll)

Public Overrides ReadOnly Property CanRead As Boolean

Property Value

Type: System.Boolean

true if the stream supports reading; false if the stream is closed or was opened with write-only access.

If a class derived from Stream does not support reading, calls to the Read, ReadByte, and BeginRead methods throw a NotSupportedException.

If the stream is closed, this property returns false.

The following example demonstrates a use of the CanRead property. The output of this code is "MyFile.txt is not writable." To get the output message "MyFile.txt can be both written to and read from.", change the FileAccess parameter to ReadWrite in the FileStream constructor.

Imports System
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

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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