C# StreamReader用法

C＃StreamReader类用于从流中读取字符串。它继承了TextReader类。它提供Read()和ReadLine()方法从流中读取数据。

C＃StreamReader示例读取一行

让我们看一下StreamReader类的简单示例，该类从文件中读取一行数据。

using System;
using System.IO;
public class StreamReaderExample
{
    public static void Main(string[] args)
    {
        FileStream f = new FileStream("e:\\output.txt", FileMode.OpenOrCreate);
        StreamReader s = new StreamReader(f);

        string line=s.ReadLine();
        Console.WriteLine(line);

        s.Close();
        f.Close();
    }
}

输出：

Hello C#

C＃StreamReader示例读取所有行

using System;
using System.IO;
public class StreamReaderExample
{
    public static void Main(string[] args)
    {
        FileStream f = new FileStream("e:\\a.txt", FileMode.OpenOrCreate);
        StreamReader s = new StreamReader(f);

        string line = "";
        while ((line = s.ReadLine()) != null)
        {
            Console.WriteLine(line);
        }
        s.Close();
        f.Close();
    }
}

输出：

Hello C#
this is file handling