BinaryReader 构造函数

定义

命名空间:

System.IO

程序集:

System.Runtime.dll

初始化 BinaryReader 类的新实例。

重载

BinaryReader(Stream)	基于所指定的流和特定的 UTF-8 编码，初始化 BinaryReader 类的新实例。
BinaryReader(Stream, Encoding)	基于所指定的流和特定的字符编码，初始化 BinaryReader 类的新实例。
BinaryReader(Stream, Encoding, Boolean)	基于所提供的流和特定的字符编码，初始化 BinaryReader 类的新实例，有选择性的打开流。

BinaryReader(Stream)

Source:

BinaryReader.cs

基于所指定的流和特定的 UTF-8 编码，初始化 BinaryReader 类的新实例。

public:
 BinaryReader(System::IO::Stream ^ input);

public BinaryReader (System.IO.Stream input);

new System.IO.BinaryReader : System.IO.Stream -> System.IO.BinaryReader

Public Sub New (input As Stream)

参数

input

Stream

输入流。

例外

ArgumentException

该流不支持读取，为null 或已关闭。

示例

下面的代码示例演示如何在文件中存储和检索应用程序设置。

using System;
using System.IO;
using System.Text;

class ConsoleApplication
{
    const string fileName = "AppSettings.dat";

    static void Main()
    {
        WriteDefaultValues();
        DisplayValues();
    }

    public static void WriteDefaultValues()
    {
        using (var stream = File.Open(fileName, FileMode.Create))
        {
            using (var writer = new BinaryWriter(stream, Encoding.UTF8, false))
            {
                writer.Write(1.250F);
                writer.Write(@"c:\Temp");
                writer.Write(10);
                writer.Write(true);
            }
        }
    }

    public static void DisplayValues()
    {
        float aspectRatio;
        string tempDirectory;
        int autoSaveTime;
        bool showStatusBar;

        if (File.Exists(fileName))
        {
            using (var stream = File.Open(fileName, FileMode.Open))
            {
                using (var reader = new BinaryReader(stream, Encoding.UTF8, false))
                {
                    aspectRatio = reader.ReadSingle();
                    tempDirectory = reader.ReadString();
                    autoSaveTime = reader.ReadInt32();
                    showStatusBar = reader.ReadBoolean();
                }
            }

            Console.WriteLine("Aspect ratio set to: " + aspectRatio);
            Console.WriteLine("Temp directory is: " + tempDirectory);
            Console.WriteLine("Auto save time set to: " + autoSaveTime);
            Console.WriteLine("Show status bar: " + showStatusBar);
        }
    }
}

open System.IO
open System.Text

let fileName = "AppSettings.dat"

let writeDefaultValues () =
    use stream = File.Open(fileName, FileMode.Create)
    use writer = new BinaryWriter(stream, Encoding.UTF8, false)
    writer.Write 1.250F
    writer.Write @"c:\Temp"
    writer.Write 10
    writer.Write true

let displayValues () =
    if File.Exists fileName then
        use stream = File.Open(fileName, FileMode.Open)
        use reader = new BinaryReader(stream, Encoding.UTF8, false)
        let aspectRatio = reader.ReadSingle()
        let tempDirectory = reader.ReadString()
        let autoSaveTime = reader.ReadInt32()
        let showStatusBar = reader.ReadBoolean()

        printfn $"Aspect ratio set to: {aspectRatio}"
        printfn $"Temp directory is: {tempDirectory}"
        printfn $"Auto save time set to: {autoSaveTime}"
        printfn $"Show status bar: {showStatusBar}"

writeDefaultValues ()
displayValues ()

Imports System.IO

Module Module1
    Const fileName As String = "AppSettings.dat"

    Sub Main()
        WriteDefaultValues()
        DisplayValues()
    End Sub

    Sub WriteDefaultValues()
        Using writer As BinaryWriter = New BinaryWriter(File.Open(fileName, FileMode.Create))
            writer.Write(1.25F)
            writer.Write("c:\Temp")
            writer.Write(10)
            writer.Write(True)
        End Using
    End Sub

    Sub DisplayValues()
        Dim aspectRatio As Single
        Dim tempDirectory As String
        Dim autoSaveTime As Integer
        Dim showStatusBar As Boolean

        If (File.Exists(fileName)) Then

            Using reader As BinaryReader = New BinaryReader(File.Open(fileName, FileMode.Open))
                aspectRatio = reader.ReadSingle()
                tempDirectory = reader.ReadString()
                autoSaveTime = reader.ReadInt32()
                showStatusBar = reader.ReadBoolean()
            End Using

            Console.WriteLine("Aspect ratio set to: " & aspectRatio)
            Console.WriteLine("Temp directory is: " & tempDirectory)
            Console.WriteLine("Auto save time set to: " & autoSaveTime)
            Console.WriteLine("Show status bar: " & showStatusBar)
        End If
    End Sub

End Module

注解

有关常见 I/O 任务的列表，请参阅 常见 I/O 任务。

另请参阅

• UTF8Encoding
• 文件和流 I/O
• 如何：从文件中读取文本
• 如何：将文本写入文件

BinaryReader(Stream, Encoding)

Source:

BinaryReader.cs

基于所指定的流和特定的字符编码，初始化 BinaryReader 类的新实例。

public:
 BinaryReader(System::IO::Stream ^ input, System::Text::Encoding ^ encoding);

public BinaryReader (System.IO.Stream input, System.Text.Encoding encoding);

new System.IO.BinaryReader : System.IO.Stream * System.Text.Encoding -> System.IO.BinaryReader

Public Sub New (input As Stream, encoding As Encoding)

参数

input

Stream

输入流。

encoding

Encoding

要使用的字符编码。

例外

ArgumentException

该流不支持读取，为null 或已关闭。

ArgumentNullException

encoding 为 null。

注解

有关常见 I/O 任务的列表，请参阅 常见 I/O 任务。

另请参阅

• 文件和流 I/O
• 如何：从文件中读取文本
• 如何：将文本写入文件

BinaryReader(Stream, Encoding, Boolean)

Source:

BinaryReader.cs

基于所提供的流和特定的字符编码，初始化 BinaryReader 类的新实例，有选择性的打开流。

public:
 BinaryReader(System::IO::Stream ^ input, System::Text::Encoding ^ encoding, bool leaveOpen);

public BinaryReader (System.IO.Stream input, System.Text.Encoding encoding, bool leaveOpen);

new System.IO.BinaryReader : System.IO.Stream * System.Text.Encoding * bool -> System.IO.BinaryReader

Public Sub New (input As Stream, encoding As Encoding, leaveOpen As Boolean)

参数

input

Stream

输入流。

encoding

Encoding

要使用的字符编码。

leaveOpen

Boolean

如果在释放 BinaryReader 对象后保持流处于打开状态，则为 true；否则为 false。

例外

ArgumentException

该流不支持读取，为null 或已关闭。

ArgumentNullException

encoding 或 input 为 null。

另请参阅

• 文件和流 I/O
• 如何：从文件中读取文本
• 如何：将文本写入文件