CanWrite Property

FileStream.CanWrite Property

Gets a value indicating whether the current stream supports writing.

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

public override function get CanWrite () : boolean

Property Value

Type: System.Boolean
true if the stream supports writing; false if the stream is closed or was opened with read-only access.

If a class derived from Stream does not support writing, a call to SetLength, Write, BeginWrite, or WriteByte throws a NotSupportedException.

If the stream is closed, this property returns false.

The following example uses the CanWrite property to check whether a stream supports writing.

No code example is currently available or this language may not be supported.

The following is an example using the CanWrite property. The output of this code is "MyFile.txt is 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.

import System;
import System.IO;

class TestRW 
{
   public static function Main() : void 
   {
       var fs : FileStream = new FileStream("MyFile.txt", FileMode.OpenOrCreate, FileAccess.Write);
       if (fs.CanRead && fs.CanWrite)
           Console.WriteLine("MyFile.txt can be both written to and read from.");
       else if (fs.CanWrite)
           Console.WriteLine("MyFile.txt is writable.");
    }
}
TestRW.Main();

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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