在C＃中更新文本文件

Question

I have a text file. I need to find some data and update some data. Let me explain it with an example. This is my text file:

NAME:Date
VALUE:02/03/2011
NAME:NoOfPages
VALUE:250
…
…
…
…
Total_Size:45725

I need to update 250 and 45725 values. So Im looking to do it using Regular Expression. Is it the best way to do that or is there any better method to do this. Can anyone can help to do it.

Im using C# and VS 2008. My application is windows based application.

Answer 1

From looking at the sample I would say a line-based approach might be just as easy.

Just read a line and check StartsWith

Answer 2

I would not use regex in your case. It seems to be a short name:value list.

I would suggest using a state variable.

1. Read line by line.
2. Split using : character.
3. Make a switch statement on the first part of the split.
   • if it is NAME then store the second part in the state value. Write the line.
   • if it is VALUE then
     • if the state value correspond to a field you must update: write the line with the new value.
     • else write the line as is.
4. Loop to 1 until EOF

Would it be possible in your case?