Saving tokens to a file

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hey guys,

i have got a list called 'tokens' and i want to be able to save and load them. i want to be able to do something like:

VB

if a.startswith("save ")
dim sw as streamwriter = new streamwriter(appdomain.currentdomain.basedirectory & a.substring(5) & ".txt")
sw.write(tokens)
sw.close()

i want to be able to do something like that, but it doesn't work. can you please help me?

Posted 10-Jun-12 17:25pm

Member 8378691

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-06-10T17:42:00

First of all, its not nice to ask about your problem with some object tokens without showing the definition of its type. It's also not nice to show the code which does not compile. What, was the using a fragment of real code a problem? How about copy/paste?

However, it does not matter it you try to use the "solution" like in the code you show. Let's understand why it cannot work. Essentially,

C#

sw.Write(tokens);

will output

C#

sw.Write(tokens.ToString());

For lists, other containers and most other types it will simply output the string containing the type name; so, what's the use?

You need to use some kind of serialization, and this is something you will probably need to learn. Please start here:
http://en.wikipedia.org/wiki/Serialization[^],
http://msdn.microsoft.com/en-us/library/ms233843.aspx[^],
http://msdn.microsoft.com/en-us/library/system.runtime.serialization%28v=vs.100%29.aspx[^].

I would strongly recommend to use Data Contract and DataContractSerializer. Please see:
http://msdn.microsoft.com/en-us/library/ms733127.aspx[^],
http://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractserializer.aspx[^].

This approach is easiest to use, very robust, universal and non-intrusive. I advocate this approach in my past answers:
How can I utilize XML File streamwriter and reader in my form application?[^],
Creating property files...[^].

—SA

Abhinav S · Answer 2 · 2012-06-10T17:35:00

Solution 1

As you can see here[^], Write has a number of overloads but none of them can take a list or collection as input.
Loop through your list and write text line by line.

Posted 10-Jun-12 17:35pm

Abhinav S

v2

Comments

Member 8378691 10-Jun-12 23:38pm

what about loading text into the list? i need to save and load text into the list. and could you please give me some code to work with?

Abhinav S 10-Jun-12 23:42pm

http://www.dotnetperls.com/streamwriter is a good sample that could help you. Look at the loop section, that is basically what you need to do - you can load data into a list.