这段代码在VS 2010中完美运行.现在我已经拥有了VS 2013,它不再写入该文件.它没有错误或任何东西. (我在记事本中收到警告,说明文件已更新,但没有写入.)
这对我来说都很好看.有任何想法吗？
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
String line;
try
{
//Pass the file path and file name to the StreamReader constructor
StreamReader sr = new StreamReader("C:\\Temp1\\test1.txt");
StreamWriter sw = new StreamWriter("C:\\Temp2\\test2.txt");
//Read the first line of text
line = sr.ReadLine();
//Continue to read until you reach end of file
while (line != null)
{
//write the line to console window
Console.WriteLine(line);
int myVal = 3;
for (int i = 0; i < myVal; i++)
{
Console.WriteLine(line);
sw.WriteLine(line);
}
//Write to the other file
sw.WriteLine(line);
//Read the next line
line = sr.ReadLine();
}
//close the file
sr.Close();
Console.ReadLine();
}
catch (Exception e)
{
Console.WriteLine("Exception: " + e.Message);
}
finally
{
Console.WriteLine("Executing finally block.");
}
}
}
}
解决方法
你需要在写入后Flush()StreamWriter.
默认情况下,StreamWriter是缓冲的,这意味着它在收到Flush()或Close()调用之前不会输出.
你也可以尝试这样关闭它：
sw.Close(); //or tw.Flush();
你也可以看看StreamWriter.AutoFlush Property
Gets or sets a value indicating whether the StreamWriter will flush
its buffer to the underlying stream after every call to
StreamWriter.Write.
另一个现在非常流行和推荐的选项是使用using statement来照顾它.
Provides a convenient Syntax that ensures the correct use of
IDisposable objects.
例：
using(var sr = new StreamReader("C:\\Temp1\\test1.txt"))
using(var sw = new StreamWriter("C:\\Temp2\\test2.txt"))
{
...
}