XML，数据表和变量-初学者问题

Question

I have a project that has to export variables and fixed values into a xml file. The idea is to save the work done, and load it again later.

Please be aware i just beginned to study c#, so shortened explanations will be hard to understand (i've been reading about other issues as well)

In some links i've read that such this is easy when you create datatables, but on the examples i've read they only talk about fixed values, and as far as i've seen, they required the table to be created in the form (wich is not the objective).

I've tried to place a code i've found around

DataTable table = new DataTable();
table.Columns.Add("Dosage", typeof(int));
table.Columns.Add("Drug", typeof(string));
table.Columns.Add("Patient", typeof(string));
table.Columns.Add("Date", typeof(DateTime));


table.Rows.Add(25, "Indocin", "David", DateTime.Now);
table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);

It's pretty neat, but, can i visualy see the table somewhere? or it's like a console list?

Can i use variables, and will it update the matrix when the program changes the variable values?

Will the table be acessible in all the forms i create in the project? Or should i create her in a separate class and make it public?

How recommended is this process when the main objective is export / import data trough xml files?

edit: i will also have to add information about checkboxes, dropdown lists, etc, not only variables, so i'm wondering if datatables are really the best way to export/import xml.

Answer 1

You can convert a DataTable into XML Like this:

string fileName =myAppPath + @"\sample.xml";

DataTable table = new DataTable();
... //your code goes here...
table.WriteXml(fileName,  XmlWriteMode.WriteSchema);

And read it like this:

string fileName =myAppPath + @"\sample.xml";
DataTable newTable = new DataTable();
newTable.ReadXml(fileName);

Regarding:

Can I use variables, and will it update the matrix when the program changes the variable values?

As for variables I guess your mean memory. And the Your DataTable is a variable and it will hold everything in memory until your write it to the file. If on the other hand you mean binding the values on the table to a control, well that would depend on the type of of technologies you are using.

Will the table be accessible in all the forms I create in the project?

Variables only exists within an scope and by scope to simplify I mean any two curly brackets "{}". In web applications(ASP.NET) for example you can use something called "session' to share data across forms and of course there are way to work this arounds in most technologies but your post does not specify it.