Re: Max File Size in Isolated Storage? - WPF Discussion Boards

Steve Maier18-Feb-11 9:36

Steve Maier

18-Feb-11 9:36

The default max is 1M for all of your domain's applications. You can ask the user for more space tho using this...

http://msdn.microsoft.com/en-us/library/system.io.isolatedstorage.isolatedstoragefile.increasequotato(v=vs.95).aspx[^]

Steve Maier

dbrenth18-Feb-11 9:46

dbrenth

18-Feb-11 9:46

But does 1000 characters take 1 megabyte to save? It actually takes 1 kilobyte.

My isolated storage variable says I have tons of free space.

The odd thing is that the stream writer doesn't throw an error.

Brent

dbrenth18-Feb-11 10:32

dbrenth

18-Feb-11 10:32

Sorry, there was another unrelated error that was interrupting the stream flushing. Fixed it and now I'm getting my entire file.

Brent

Abhinav S20-Feb-11 17:53

20-Feb-11 17:53

Well. Thanks for posting the solution.

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

XmlDocument

arkiboys18-Feb-11 5:26

arkiboys

18-Feb-11 5:26

The following line does not compile in silverlight 4.0

XmlDocument myFile = new XmlDocument();

Note that I do have a reference to system.xml and also using the
using System.Xml namespace

Any thoughts please?
Thanks

Abhinav S18-Feb-11 6:12

18-Feb-11 6:12

You can't really use XMLDocument.

What you need to do is use XDocument and do something like -
XDocument myFIle = XDocument.Parse(xmlContent);

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

#realJSOP19-Feb-11 2:35

#realJSOP

19-Feb-11 2:35

I agree that he should probably use the newer classes, he can still use XmlDocument that way if he wants to. See my answer to his question.

".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997

#realJSOP19-Feb-11 2:34

#realJSOP

19-Feb-11 2:34

Try this. It's an example I found - using google - on the MSDN web site :

using System.IO;
using System.Xml;
using System.Xml.Schema;

private void LoadXmlData()
{
    XmlValidatingReader reader    = null;
    XmlTextReader       txtReader = null;
    string              filename  = "myfilename.xml";
    try 
    {
        // Create the validating reader and specify DTD validation.
        txtReader = new XmlTextReader(filename);
        reader = new XmlValidatingReader(txtReader);
        reader.ValidationType = ValidationType.DTD;

        // Set a handler to handle validation errors.
        reader.ValidationEventHandler += eventHandler;

        // Pass the validating reader to the XML document.
        // Validation fails due to an undefined attribute, but the 
        // data is still loaded into the document.
        XmlDocument doc = new XmlDocument();
        doc.Load(reader);

        // do something with doc.OuterXml
    }
    finally 
    {
        if (reader != null) 
        {
            reader.Close();
        }
    }
}

void ValidationCallback(object sender, ValidationEventArgs args ) 
{
    // report the validation error
}

EDIT ===

I missed the fact that you're using Silverlight. Loading a client-side file can be problematic if nigh impossible (unless you're running out of browser and the file is in a specific place).

Abhinav S19-Feb-11 3:14

Access xml file from .xaml page

19-Feb-11 3:14

Ah I see. Thanks.

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

arkiboys18-Feb-11 5:16

arkiboys

18-Feb-11 5:16

In my solution, there is a silverlight 4.0 project as well as the web host project.

Question:
From one of the .xaml files i.e. mainpage.xaml which is inside the silverlight project, I would like to access an xml file i.e. test.xml
Which is also inside the silverlight project.

How can I do this please?

Thanks

Re: Access xml file from .xaml page

Abhinav S18-Feb-11 6:24

MVVM: Best Practices and Design Patterns

18-Feb-11 6:24

Through the code behing you can[^].
I dont think the XAML is powerful enough to load an xml file in SIlverlight.

The funniest thing about this particular signature is that by the time you realise it doesn't say anything it's too late to stop reading it.

IngoVals18-Feb-11 4:54

IngoVals

18-Feb-11 4:54

While the title is somewhat generic I would love to disucss this as a beginner with experienced MVVM users and other beginners as well.

I have created a WPF app mostly ignoring MVVM, at least to begin with. I have now decided to refactor it and use MVVM. I'm hoping to make it better and easier to manage. However there are several things I'm not 100% certain about how to implement some things in MVVM. I guess there isn't just one way but I would love to hear what you like to do and how. I'm adding numbered discussion points here to better catagorize. If others have questions or thoughts to add please be welcome.

1) Most MVVM examples are quite simple. In reality it can be quite different. For example I often have objects that include a number of other objects which also include other objects. So there is a View where users could choose an object from a list, see detailed info about it and also a list of objects that are it's children. They could then choose a child object and get detailed info about it as well.

How does this apply as ViewModels. Is it a single viewmodel that includes everything, or a viewmodel that opens another different viewmodel. I would like to have the child object as it's own ViewModel/UserControl - View and have the parent able to show this UserControl within it's own.

Would you rather have the child inside the parents viewmodel or seperate but linked?

Can you point out examples or books that investigates this?

2) iEditableObject, I've used this interface on my objects and it works with CollectionViews. I haven't really seen it mention in MVVM. It means a object can basically be in a EditMode and you can rollback changes made and such. Now in my program when you look at the details of a object they are static, meaning you can't change text (it's textBlocks not TextBox), then you press a EDIT button and you get the edit look. I've done this by switching out the dataTemplate for the object. However that seems to mean logic inside Xaml. I guess I could do it in code, or just have seperate UserControls and swithc them out

Also this handles well adding new items to collections but I haven't seen this used in any MVVM example I've seen. Could you point out any?

3) If many apps are getting the data from the same place, and they can change that data. How do you keep the data current. Do you reload it regulary, use ActiveRecord pattern. I guess this has nothing to do with MVVM but I'm fishing out what people have used alongwith MVVM with good results.

4) Can you use LINQ entity items with any good results, like perhaps populating the viewmodel with them? It's not proper to keep the context open but having the object itself might help with saving back to database. What happens to a LINQ object when the Context is closed. Do I still have access to it's relative tables an such.

5) I'm very often showing objects as lists+details for the selected object (master detail view). However the details between objects can be somewhat different. I guess I could make a abstract ViewModel for their common functionality but what about the Views themselves. It will have the same buttons, the same format showing the list and then the details. Basicly the only difference will be the fields in the detail. I can't make a abstract UserControl (except without the XAML). How to solve this? Using styles, ControlTemplates? Again any examples out there I could check out?

I'll probably have million other questions but this is enough for now. If anyone can answer or just point towards something with good answers/examples I would be very happy.

Most of what I know about MVVM comes from http://msdn.microsoft.com/en-us/magazine/dd419663.aspx

Re: MVVM: Best Practices and Design Patterns

Abhinav S18-Feb-11 6:20