流编写器问题？ [英] Stream writer issue ?

问题描述

 TextWriter tw = System.IO.File.CreateText（sOutputFilePath + sOutFileName）; 
  if （record ==   abcd ）
 {
 id =  10 ; 
 name =   John; 
  string  sout =  ; 
 sout = id +   | + name; 
 tw.WriteLine（sout）;  //   file1中的输出 
 
} 
  else   if （record ==   efgh）
 {
 id =  11 ; 
 name =   Sam; 
  string  sout1 =  ; 
 sout1 = id +   | + name; 
 tw.WriteLine（sout1）;输出 in  file2 
} 
  else  
 {
 } 

问题是file1总是空的，只有file2工作正常。



你能指导我吗。



我尝试了什么：



没有想到请帮忙我

解决方案

您需要两个 TextWriters ：

<预LANG = C＃> TextWriter的TW1 = System.IO.File.CreateText（sOutputFilePath + sOutFileName1）;
...
的TextWriter TW2 = System.IO.File.CreateText（sOutputFilePath + sOutFileName2）;

另外别忘了，当你完成关闭它们：

 tw1.Close（）; 
 tw2.Close（）; 

首先缩进你的代码，它有助于阅读。

 TextWriter tw = System.IO.File.CreateText（sOutputFilePath + sOutFileName）; 
  if （record ==   abcd ）
 {
 id =  10 ; 
 name =   John; 
  string  sout =  ; 
 sout = id +   | + name; 
 tw.WriteLine（sout）;  //   file1中的输出 
 
} 
  else   if （record ==   efgh）
 {
 id =  11 ; 
 name =   Sam; 
  string  sout1 =  ; 
 sout1 = id +   | + name; 
 tw.WriteLine（sout1）;输出 in  file2 
} 
  else  
 {
 } 

使用调试器查看代码正在执行的操作。我们无法测试你的代码，因为它不是一段自治的代码。

-----

有一个工具可以让你看到你的代码是什么正在做，它的名字是调试器。它也是一个很好的学习工具，因为它向你展示了现实，你可以看到哪种期望与现实相符。

当你不明白你的代码在做什么或为什么它做它做的时候，答案就是答案是调试器。

使用调试器查看代码正在执行的操作。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量。



调试器 - 维基百科，免费的百科全书 [ ^ ]



掌握Visual Studio 2010中的调试 - 初学者指南 [ ^ ]

使用Visual Studio 2010进行基本调试 - YouTube [ ^ ]

在Visual Studio中调试C＃代码 - 您管 [ ^ ]

调试器在这里向您展示您的代码正在做什么，您的任务是与它应该做什么进行比较。

调试器中没有魔法，它找不到错误，它只是帮助你。当代码没有达到预期的效果时，你就接近了一个bug。

更简单易用的是 File.AppendAllText ，参见这里的示例： a href =https://www.dotnetperls.com/file-appendalltext> [ dotnetperls ]

使用它时，您不必担心打开和关闭流。

TextWriter tw = System.IO.File.CreateText(sOutputFilePath + sOutFileName);
    if (record == "abcd")
    {
        id = 10;
        name = "John";
        string sout = "";
        sout = id + "|" + name;
        tw.WriteLine(sout);//output in file1

    }
    else if (record == "efgh")
    {
        id = 11;
        name = "Sam";
        string sout1 = "";
        sout1 = id + "|" + name;
        tw.WriteLine(sout1); output in file2
    }
    else
    {
    }

Problem is file1 is always empty , only file2 is working correctly.

Can you please guide me.

What I have tried:

not getting idea please help me.

解决方案

You need two TextWriters:

TextWriter tw1 = System.IO.File.CreateText(sOutputFilePath + sOutFileName1);
...
TextWriter tw2 = System.IO.File.CreateText(sOutputFilePath + sOutFileName2);

Also don't forget to close them when you're done:

tw1.Close(); 
tw2.Close();

First of all indent your code properly, it helps reading.

TextWriter tw = System.IO.File.CreateText(sOutputFilePath + sOutFileName);
if(record == "abcd")
{
	id=10;
	name="John";
	string sout ="";
	sout=id+ "|" +name;
	tw.WriteLine(sout);//output in file1

}
else if(record == "efgh")
{
	id=11;
	name="Sam";
	string sout1 ="";
	sout1 =id+ "|" +name;
	tw.WriteLine(sout1); output in file2
}
else
{
}

Use the debugger to see what your code is doing. We can't test your code as it is not an autonomous piece of code.
-----
There is a tool that allow you to see what your code is doing, its name is debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]
Debugging C# Code in Visual Studio - YouTube[^]
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

Even simpler to use is File.AppendAllText, see example here: [dotnetperls]
You don't have to worry about opening and closing a stream when you use this.

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