在 C# 中，BinaryWriter 是一個用於將原始型別寫入特定編碼流中的二進位資料的類別。它存在於 System.IO 命名空間下。
以下是有關 BinaryWriter 的一些要點：
建立 BinaryWriter 物件的建構子有四種重載形式。使用其所有重載建構函式建立 BinaryWriter 物件的語法如下：
文法 #1
protected BinaryWriter();
它用來初始化 BinaryWriter 類別的實例。
文法#2
BinaryWriter binaryWriter = new BinaryWriter(outputStream) ;
上面的語句根據指定的流（outputStream）並使用UTF-8字元編碼來初始化BinaryWriter類別的新實例。
文法#3
BinaryWriter binaryWriter = new BinaryWriter(outputStream, encoding);
上面的語句根據指定的流（outputStream）和字元編碼（encoding）初始化一個新的BinaryWriter實例。
文法#4
BinaryWriter binaryWriter = new BinaryWriter(outputStream, encoding, true);
代碼：
using (BinaryWriter binaryWriter = new BinaryWriter(File.Open(fileName, FileMode.Create )) )
{
//user code
}這裡，File.Open() 方法傳回 FileStream 對象，有助於建立 BinaryWriter 的實例。
下表顯示了BinaryWriter針對不同資料類型的一些Write()方法的詳細資訊：
| Method | Description |
| Write(Boolean) | This method is used to write the one-byte Boolean value to the present stream; 0 represents false while 1 represents true. |
| Write(Byte) | This method is used to write an unsigned byte to the present stream and then it advances the position of the stream by one byte. |
| Write(Char) | This method is used to write Unicode character to present stream and also it advances the present stream position according to the character encoding used and according to the characters being written to the present stream. |
| Write(Decimal) | This method is used to write a decimal value to the present stream and also it advances the position of the current stream by sixteen bytes. |
| Write(Double) | This method is used to write an eight-byte floating-point value to the present stream and then it also advances the position of the current stream by eight bytes. |
| Write(Int32) | This method is used to write a four-byte signed integer to the present stream and then it advances the position of current stream by four bytes. |
| Write(String) | This method is used to write length prefixed string to present stream in the present encoding of BinaryWriter and also it advances the current stream position according to the encoding used and according to the characters being written to the present stream. |
Example showing the creation of file:
Code:
using System;
using System.IO;
namespace ConsoleApp4
{
public class Demo
{
string fileLocation = "E:\\Content\\newBinaryFile.dat";
public void WritingFile()
{
try
{
//checking if file exists
if (File.Exists(fileLocation))
{
File.Delete(fileLocation);
}
FileStream fileStream = new FileStream(fileLocation, FileMode.Create,
FileAccess.Write, FileShare.ReadWrite);
//creating binary file using BinaryWriter
using (BinaryWriter binaryWriter = new BinaryWriter(fileStream))
{
//writing data using different Write() methods
//of BinaryWriter
binaryWriter.Write(5253);
binaryWriter.Write("This is a string value.");
binaryWriter.Write('A');
}
}
catch (Exception exception)
{
Console.WriteLine(exception.Message);
}
}
public void ReadingFile()
{
try
{
FileStream fileStream = new FileStream(fileLocation, FileMode.Open,
FileAccess.Read, FileShare.ReadWrite);
using (BinaryReader binaryReader = new BinaryReader(fileStream))
{
Console.WriteLine("IntegerValue = " + binaryReader.ReadInt32());
Console.WriteLine("StringValue = " + binaryReader.ReadString());
Console.WriteLine("CharValue = " + binaryReader.ReadChar());
}
}
catch (Exception exception)
{
Console.WriteLine(exception.Message);
}
}
}
public class BinaryWriterDemo
{
static void Main(string[] args)
{
Demo demoObj = new Demo();
demoObj.WritingFile();
demoObj.ReadingFile();
Console.ReadLine();
}
}
}Output:
In C#, the BinaryWriter class is used to write primitive types as binary information to the stream. If the encoding is not defined, then the BinaryWriter class uses the default UTF-8 character encoding to write data to a binary file. An object of BinaryWriter can be created using the Stream object.
以上是C# 中的二進位編寫器的詳細內容。更多資訊請關注PHP中文網其他相關文章！
