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BinaryWriter.Write Method (Double)

Writes an eight-byte floating-point value to the current stream and advances the stream position by eight bytes.

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

'Declaration
Public Overridable Sub Write ( _
	value As Double _
)
'Usage
Dim instance As BinaryWriter
Dim value As Double

instance.Write(value)
public void Write (
	double value
)
public function Write (
	value : double
)

Parameters

value

The eight-byte floating-point value to write.

Exception typeCondition

IOException

An I/O error occurs.

ObjectDisposedException

The stream is closed.

The following table lists examples of other typical or related I/O tasks.

To do this...

See the example in this topic...

Create a text file.

How to: Write Text to a File

Write to a text file.

How to: Write Text to a File

Read from a text file.

How to: Read Text from a File

Append text to a file.

How to: Open and Append to a Log File

File.AppendText

FileInfo.AppendText

Get the size of a file.

FileInfo.Length

Get the attributes of a file.

File.GetAttributes

Set the attributes of a file.

File.SetAttributes

Determine if a file exists.

File.Exists

Read from a binary file.

How to: Read and Write to a Newly Created Data File

Write to a binary file.

How to: Read and Write to a Newly Created Data File

The following code example shows how to read and write Double data to memory by using the BinaryReader and BinaryWriter classes on top of the MemoryStream class. MemoryStream only reads and writes Byte data.

Imports System
Imports System.IO

Public Class BinaryRW

    Shared Sub Main()
    
        Dim i As Integer
        Const upperBound As Integer = 1000

        ' Create random data to write to the stream.
        Dim dataArray(upperBound) As Double
        Dim randomGenerator As New Random()
        For i = 0 To upperBound
            dataArray(i) = 100.1 * randomGenerator.NextDouble()
        Next i

        Dim binWriter As New BinaryWriter(New MemoryStream())
        Try

            ' Write data to the stream.
            Console.WriteLine("Writing data to the stream.")
            
            For i = 0 To upperBound
                binWriter.Write(dataArray(i))
            Next i

            ' Create a reader using the stream from the writer.
            Dim binReader As New BinaryReader(binWriter.BaseStream)

            ' Return to the beginning of the stream.
            binReader.BaseStream.Position = 0

            ' Read and verify the data.
            Try
                Console.WriteLine("Verifying the written data.")
                For i = 0 To upperBound
                    If binReader.ReadDouble() <> dataArray(i) Then
                        Console.WriteLine("Error writing data.")
                        Exit For
                    End If
                Next i
                Console.WriteLine("The data was written and verified.")
            Catch ex As EndOfStreamException
                Console.WriteLine("Error writing data: {0}.", _
                    ex.GetType().Name)
            End Try
        Finally
            binWriter.Close()
        End Try

    End Sub
End Class

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

class BinaryRW
{   
    public static void main(String[] args)
    {
        int i;
        final int arrayLength = 1000;

        // Create random data to write to the stream.
        Random randomGenerator = new Random();
        double dataArray[] = new double[arrayLength];
        for(i = 0;i < arrayLength;i++) {
            dataArray[i] = 100.1*randomGenerator.NextDouble() ;
        }
        BinaryWriter binWriter = new BinaryWriter(new MemoryStream());
        try {
            // Write the data to the stream.
            Console.WriteLine("Writing data to the stream.");
            for(i = 0;i < arrayLength;i++)    {
                binWriter.Write(dataArray [ i]);
            }
            // Create a reader using the stream from the writer.
            BinaryReader binReader = 
                new BinaryReader(binWriter.get_BaseStream());
            try {
                try {
                    // Return to the beginning of the stream.
                    binReader.get_BaseStream().set_Position(0);

                    // Read and verify the data.
                    Console.WriteLine("Verifying the written data.");
                    for(i = 0;i < arrayLength;i++) {
                        if ( binReader.ReadDouble() != dataArray[i] ) {
                            Console.WriteLine("Error writing data.");
                            break;
                        }
                    } 
                    Console.WriteLine(("The data was written "
                        + "and verified."));
                }
                catch(EndOfStreamException e) {
                    Console.WriteLine("Error writing data: {0}.",
                        e.GetType().get_Name());
                }
            }
            finally {
                if (binReader != null) {
                    binReader = null;
                }
            }
        }
        finally {
            if (binWriter != null) {
                binWriter = null;
            }
        }
    } //main
} //BinaryRW

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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