CanWrite Property (OracleLob)

In This Topic

Syntax
Remarks
Example
Requirements
See Also

Gets a value indicating whether the OracleLob object supports writing.

Syntax

Visual Basic
C#

public override bool CanWrite {get;}

'Declaration
 
Public Overrides ReadOnly Property CanWrite As Boolean

Property Value

true if the OracleLob stream can be written; false if a OracleLob is closed, disposed or Null.

Remarks

Use this property to determine whether you can write to the instance of OracleLob class.

Example

csharp

static void ReverseBlob() 
{ 
        byte[] byteArray = { (byte)'A', (byte)'B', (byte)'C' }; 
        OracleLob blobFrom = new OracleLob(OracleDbType.Blob);
        blobFrom.Write(byteArray, 0, byteArray.Length);
        //blobFrom.ToString() = "ABC" 

        OracleLob blobTo = new OracleLob(OracleDbType.Blob); 
        ........
        //reverse OracleLob 
        if (blobFrom.CanSeek && blobFrom.CanRead && blobTo.CanWrite) 
                for (blobFrom.Seek(-1, System.IO.SeekOrigin.End); ;blobFrom.Position -= 2) 
                { 
                        blobTo.WriteByte((byte)blobFrom.ReadByte()); 
                        if (blobFrom.Position == 1) break; 
                } 
        //blobTo.ToString() = "CBA"; 
}

Visual Basic

Private Sub ReverseBlob()
        Dim byteArray As Byte() = New Byte() {AscW("A"c), AscW("B"c), AscW("C"c)}
        Dim blobFrom As New OracleLob(OracleDbType.Blob)
        blobFrom.Write(byteArray, 0, byteArray.Length)
        ' blobFrom.ToString() = "ABC"

        Dim blobTo As New OracleLob(OracleDbType.Blob)
        ........
        ' reverse OracleLob
        If ((blobFrom.CanSeek AndAlso blobFrom.CanRead) AndAlso blobTo.CanWrite) Then
                blobFrom.Seek(CLng(-1), System.IO.SeekOrigin.End)
                Do While True
                        blobTo.WriteByte(CByte(blobFrom.ReadByte))
                        If (blobFrom.Position = 1) Then
                                Return
                        End If
                        blobFrom.Position = blobFrom.Position - 2
                Loop
        End If
        ' blobTo.ToString() = "CBA";
End Sub

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

OracleLob Class
OracleLob Members

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