C#StreamReader类用于从流中读取字符串。它继承TextReader类。它提供read()和ReadLine()方法从流中读取数据。
读取一行的C#StreamReader示例
让无涯教程看一下从文件中读取单行数据的StreamReader类的简单示例。
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);
</span><span class="kwd">string</span><span class="pln"> line</span><span class="pun">=</span><span class="pln">s</span><span class="pun">.</span><span class="typ">ReadLine</span><span class="pun">();</span><span class="pln">
</span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="pln">line</span><span class="pun">);</span><span class="pln">
s</span><span class="pun">.</span><span class="typ">Close</span><span class="pun">();</span><span class="pln">
f</span><span class="pun">.</span><span class="typ">Close</span><span class="pun">();</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
}
输出：
Hello C#
读取所有行的C#StreamReader示例
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);
</span><span class="kwd">string</span><span class="pln"> line </span><span class="pun">=</span><span class="pln"> </span><span class="str">""</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">while</span><span class="pln"> </span><span class="pun">((</span><span class="pln">line </span><span class="pun">=</span><span class="pln"> s</span><span class="pun">.</span><span class="typ">ReadLine</span><span class="pun">())</span><span class="pln"> </span><span class="pun">!=</span><span class="pln"> </span><span class="kwd">null</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
</span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="pln">line</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
s</span><span class="pun">.</span><span class="typ">Close</span><span class="pun">();</span><span class="pln">
f</span><span class="pun">.</span><span class="typ">Close</span><span class="pun">();</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
}
输出：
Hello C# this is file handling
