CanWrite Property (OracleLob)

In This Topic

Gets a value indicating whether the OracleLob object supports writing.

Syntax

Visual Basic
C#

'Declaration
 
Public Overrides ReadOnly Property CanWrite As Boolean

public override bool CanWrite {get;}

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

Reference

OracleLob Class
OracleLob Members

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