FileStream.CanRead Property
Definition
Important
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Gets a value that indicates whether the current stream supports reading.
public:
virtual property bool CanRead { bool get(); };
public override bool CanRead { get; }
member this.CanRead : bool
Public Overrides ReadOnly Property CanRead As Boolean
Property Value
true
if the stream supports reading; false
if the stream is closed or was opened with write-only access.
Examples
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.
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.");
}
}
}
open System.IO
let fs = new FileStream("MyFile.txt", FileMode.OpenOrCreate, FileAccess.Read)
if fs.CanRead && fs.CanWrite then
printfn "MyFile.txt can be both written to and read from."
else if fs.CanRead then
printfn "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
Remarks
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
.