Debug.Flush Debug.Flush Debug.Flush Debug.Flush Method

Definition

Flushes the output buffer and causes buffered data to write to the Listeners collection.

public:
 static void Flush();
[System.Diagnostics.Conditional("DEBUG")]
public static void Flush ();
static member Flush : unit -> unit
Public Shared Sub Flush ()

Examples

The following example creates a TextWriterTraceListener named myTextListener. myTextListener uses a FileStream called myFileStream to write to a file named TestFile.txt. The example creates the stream, opens the file if it exists or creates a new one, writes one line of text to the file, and then flushes and closes the output.

// Specify /DDEBUG when compiling.

#using <System.dll>
using namespace System;
using namespace System::IO;
using namespace System::Diagnostics;

void main()
{
     #if defined(DEBUG)
    // Create a new stream object for an output file named TestFile.txt.
    FileStream^ myFileStream = 
        gcnew FileStream( "TestFile.txt", FileMode::Append );
   
    // Add the stream object to the trace listeners.
    TextWriterTraceListener^ myTextListener = 
        gcnew TextWriterTraceListener( myFileStream );
    Debug::Listeners->Add( myTextListener );
   
    // Write output to the file.
    Debug::WriteLine( "Test output" );
   
    // Flush and close the output stream.
    Debug::Flush();
    Debug::Close();
    #endif
}
// Specify /d:DEBUG when compiling.

using System;
using System.IO;
using System.Diagnostics;

class Test
{
    static void Main()
    {
        // Create a new stream object for an output file named TestFile.txt.
        using (FileStream myFileStream = 
            new FileStream("TestFile.txt", FileMode.Append))
        {
            // Add the stream object to the trace listeners.
            TextWriterTraceListener myTextListener = 
                new TextWriterTraceListener(myFileStream);
            Debug.Listeners.Add(myTextListener);
          
            // Write output to the file.
            Debug.WriteLine("Test output");
         
            // Flush and close the output stream.
            Debug.Flush();
            Debug.Close();
        }
    }
}
' Specify /d:DEBUG=True when compiling.

Imports System
Imports System.IO
Imports System.Diagnostics

Class Test
    
    Shared Sub Main()
    
        ' Create a new stream object for an output file named TestFile.txt.
        Using myFileStream As New FileStream("TestFile.txt", FileMode.Append)
        
            ' Add the stream object to the trace listeners. 
            Dim myTextListener As New TextWriterTraceListener(myFileStream)
            Debug.Listeners.Add(myTextListener)
            
            ' Write output to the file.
            Debug.WriteLine("Test output")
            
            ' Flush and close the output stream.
            Debug.Flush()
            Debug.Close()
        
        End Using
        
    End Sub 'Main

End Class

Remarks

Flushing the stream will not flush its underlying encoder unless you explicitly call Flush or Close. Setting AutoFlush to true means that data will be flushed from the buffer to the stream, but the encoder state will not be flushed. This allows the encoder to keep its state (partial characters) so that it can encode the next block of characters correctly. This scenario affects UTF8 and UTF7 where certain characters can only be encoded after the encoder receives the adjacent character or characters.

Applies to

See also