BinaryReader 构造函数

定义

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)

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

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

适用于

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。

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

该流不支持读取,为null 或已关闭。

encodingnull

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

适用于

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。

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

该流不支持读取,为null 或已关闭。

encodinginputnull

另请参阅

适用于