2 replies to this topic

[Verdris]

Hi all,

 

I would like to modify my project to include a method to read the most recent entry from a datafile, however, I can't afford to load the whole file into memory, for by the end of the day it's several hundred KB in size.

 

In regular .NET, I could say such as

string[] gooby = File.ReadLines(dataFile).Last().Split(',');

And be done with it. However, .NETMF has no ReadLines() method. Ideas?

[martin2250]

Hi Verdris,

 

first of all, even if that method was implemented, it wouldn't work because it would read all lines to RAM and then pick the last one, that would result in an OutOfMemoryException.

 

My approach would be a making a new StreamReader, and then work with the position value. If you want to read the last line, you should save its position to the first 4 bytes of the file everytime you're appending something to the file, then later read them and set the position of the StreamReader accordingly.

 

Greetings,

 

Martin

[Verdris]

Hi Verdris,

 

first of all, even if that method was implemented, it wouldn't work because it would read all lines to RAM and then pick the last one, that would result in an OutOfMemoryException.

 

My approach would be a making a new StreamReader, and then work with the position value. If you want to read the last line, you should save its position to the first 4 bytes of the file everytime you're appending something to the file, then later read them and set the position of the StreamReader accordingly.

 

Greetings,

 

Martin

It was my understanding that ReadLines() is a streaming method. Thanks for clarifying!