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FileStream.CanRead Property

Gets a value indicating whether the current stream supports reading.

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

public:
virtual property bool CanRead {
	bool get () override;
}
/** @property */
public boolean get_CanRead ()

public override function get CanRead () : boolean

Not applicable.

Property Value

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.

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;
}


import System.*;
import System.IO.*;

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

 import System;
 import System.IO;
 
class TestRW 
{
   public static function Main() : void 
   {
 
         var fs : FileStream = 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.");
      }
   }
}
TestRW.Main();

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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