如何替换文本文件内容 [英] How to replace a textfile content

问题描述

如何用字符串替换文本文件的数字?

输入文件:
索引1-25(1-25是页码范围)
类别26-50

页码应根据以下条件替换:
if(pageno> 1和pageno&=; 25)
字符串rep =" ";
s.replace(s，pageno，rep);
否则if(pageno> 25和pageno&=; 50)
字符串rep =" ";
s.replace(s，pageno，rep);
如果
结束
输出文件:
索引 index.html
类别 categories.html

但是我们如何读取/识别页码并将其获取到 pageno 这样的变量中?

Hi,
How can we replace numbers of a text file with strings?

Input file :
index 1-25 (the 1-25 is the page number range)
categories 26-50

The page numbers should replace based on conditions like:
if(pageno > 1 and pageno <= 25)
string rep="";
s.replace(s,pageno,rep);
else if(pageno > 25 and pageno <= 50)
string rep="";
s.replace(s,pageno,rep);
end if

Out file :
index index.html
categories categories.html

but how can we read/identify the page numbers and to get them to a variable like pageno ?

推荐答案

如果文件不是太大，则可以使用类System.IO.StreamReader打开它，并使用System.IO.StreamReader.ReadToEnd读取全部内容，替换您需要的任何内容，然后使用类System.IO.StreamWriter将内容写回.请参阅:
http://msdn.microsoft.com/en-us/library/system.io. streamreader.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/system.io. streamwriter.aspx [^ ].

如果文件很大，则可以使用类System.IO.FileStream在读写模式下使用流.您将需要在文件模式System.IO.FileMode.Open和文件访问权限System.IO.FileAccess.ReadWrite中使用构造函数System.IO.FileStream.FileStream(string path, System.IO.FileMode mode, System.IO.FileAcces access).请参阅:
http://msdn.microsoft.com/en-us/library/system.io. filestream.aspx [^ ]，
http://msdn.microsoft.com/en-us/library/tyhc0kft.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/system.io. filemode.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/4z36sx0f.aspx [ ^ ].

您可以使用属性

If the file is not too big, you can open it with the class System.IO.StreamReader read the whole content using System.IO.StreamReader.ReadToEnd, replace whatever you need and write the content back using the class System.IO.StreamWriter. Please see:
http://msdn.microsoft.com/en-us/library/system.io.streamreader.aspx[^],
http://msdn.microsoft.com/en-us/library/system.io.streamwriter.aspx[^].

If the file is big, you can use a stream in read-write mode using the class System.IO.FileStream. You will need to use the constructor System.IO.FileStream.FileStream(string path, System.IO.FileMode mode, System.IO.FileAcces access) with the file mode System.IO.FileMode.Open and file access System.IO.FileAccess.ReadWrite. Please see:
http://msdn.microsoft.com/en-us/library/system.io.filestream.aspx[^],
http://msdn.microsoft.com/en-us/library/tyhc0kft.aspx[^],
http://msdn.microsoft.com/en-us/library/system.io.filemode.aspx[^],
http://msdn.microsoft.com/en-us/library/4z36sx0f.aspx[^].

You can read and write from any position using the property

System.IO.FileStream.Position<code>.<br />
<br />
<dd>—SA</dd>

这篇关于如何替换文本文件内容的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！