C# StreamReader
類用於從流中讀取字串。它繼承自TextReader
類,它提供Read()
和ReadLine()
方法從流中讀取資料。
下面來看看一個StreamReader
類的簡單例子,它從檔案中讀取一行資料。
using System;
using System.IO;
public class StreamReaderExample
{
public static void Main(string[] args)
{
FileStream f = new FileStream("e:\\myoutput.txt", FileMode.OpenOrCreate);
StreamReader s = new StreamReader(f);
string line = s.ReadLine();
Console.WriteLine(line);
string line2 = s.ReadLine();
Console.WriteLine(line2);
s.Close();
f.Close();
}
}
假設e:\myoutput.txt檔案的內容如下 -
This is line 1
This is line 2
This is line 3
This is line 4
執行上面範例程式碼,得到以下輸出結果 -
This is line 1
This is line 2
下面程式碼演示如何使用 StreamReader
來讀取檔案:myoutput.txt中的所有行內容 -
using System;
using System.IO;
public class StreamReaderExample
{
public static void Main(string[] args)
{
FileStream f = new FileStream("e:\\myoutput.txt", FileMode.OpenOrCreate);
StreamReader s = new StreamReader(f);
string line = "";
while ((line = s.ReadLine()) != null)
{
Console.WriteLine(line);
}
s.Close();
f.Close();
}
}
執行上面範例程式碼,得到以下輸出結果 -
This is line 1
This is line 2
This is line 3
This is line 4