StringReader 类

定义

public ref class StringReader : System::IO::TextReader

public class StringReader : System.IO.TextReader

[System.Serializable]
public class StringReader : System.IO.TextReader

[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public class StringReader : System.IO.TextReader

type StringReader = class
    inherit TextReader

[<System.Serializable>]
type StringReader = class
    inherit TextReader

[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type StringReader = class
    inherit TextReader

Public Class StringReader
Inherits TextReader

继承

Object

TextReader

StringReader

继承

Object

MarshalByRefObject

TextReader

StringReader

属性

SerializableAttribute ComVisibleAttribute

示例

以下示例演示如何以异步方式读取整个字符串。

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

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            ReadCharacters();
        }

        static async void ReadCharacters()
        {
            StringBuilder stringToRead = new StringBuilder();
            stringToRead.AppendLine("Characters in 1st line to read");
            stringToRead.AppendLine("and 2nd line");
            stringToRead.AppendLine("and the end");

            using (StringReader reader = new StringReader(stringToRead.ToString()))
            {
                string readText = await reader.ReadToEndAsync();
                Console.WriteLine(readText);
            }
        }
    }
}
// The example displays the following output:
//
// Characters in 1st line to read
// and 2nd line
// and the end
//

Imports System.IO
Imports System.Text

Module Module1

    Sub Main()
        ReadCharacters()
    End Sub

    Async Sub ReadCharacters()
        Dim stringToRead = New StringBuilder()
        stringToRead.AppendLine("Characters in 1st line to read")
        stringToRead.AppendLine("and 2nd line")
        stringToRead.AppendLine("and the end")

        Using reader As StringReader = New StringReader(stringToRead.ToString())
            Dim readText As String = Await reader.ReadToEndAsync()
            Console.WriteLine(readText)
        End Using
    End Sub
End Module
' The example displays the following output:
'
' Characters in 1st line to read
' and 2nd line
' and the end
'

注解

StringReader 使你能够以同步或异步方式读取字符串。 可以使用 或 ReadAsync 方法一次Read读取字符，一次使用 ReadLine 或 方法读取一行，并使用 ReadToEnd 或 ReadLineAsyncReadToEndAsync 方法读取整个字符串。

下表列出了其他典型或相关 I/O 任务的示例。

构造函数

方法

显式接口实现

适用于

另请参阅

• TextReader
• StringWriter
• 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