CODEWITHSUNDEEP
c#silverlightwindows-phone-7.1windows-phone-7
Allan Haapalainen
Allan Haapalainen

Reputation: 107

Adding data to an existing XML file in IsolatedStorage using XmlSerializer

I'm making an attendance app for teachers as a school project and I'm having problems with updating the xml file in isolated storage. I'm parsing the names of the students to a listbox from a custom xml file using LINQ to XML. Each listbox item has a checkbox and the name of the student. I then store the selected students to IsolatedStorage along with the current date using XmlSerializer. When I retrieve the stored xml file everything seems to be working but when I want to add more students, it just overwrites the previously stored file and doesn't add to it. How can I fix this bug so that it adds to the existing xml file instead of overwriting it?

Here are my save and load classes:

I appreciate all the help you can give me. Thanks!

Upvotes: 0

Views: 585

Answers (1)

ZombieSheep
ZombieSheep

Reputation: 29963

Not on my dev machine to give you an example, but assuming your serialised file is a list of students, try the following methodology.

1) Deserialise the file you already have back into a list of objects.
2) Add the students to the deserialised list.
eg MyList.Add(new Student { Name = "Charlie Smith" });
or MyList.AddRange(MyListOfNewStudentsToAdd)
3) Serialise the whole list (with newly added data) back to the file.

That should work.

Upvotes: 1

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