Isolated Storage not working on windows phone app

Question

I have this Isolated Storage Function to write into storage :

public static void WriteIsolatedStorage(object ObjectToStore, StorageType Key)
{

    using (var storage = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication())
    using (var storageFile = storage.CreateFile(Key.ToString()))
    {
        var xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(string));
        switch (Key)
        {
            case StorageType.UserCredentials:
                xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFUserCredentials));
                break;
            case StorageType.BackgroundAgentUserCredentials:
                xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFUserCredentials));
                break;
            case StorageType.UserProfile:
                xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFUser));
                break;
            case StorageType.InboxItems:
                xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(ObservableCollection<dmWFInboxItem>));
                break;
            case StorageType.InboxTileItems:
                xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(ObservableCollection<dmInboxTileInfo>));
                break;
            case StorageType.DocumentHeaders:
                xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(ObservableCollection<dmWFDocumentHeader>));
                break;
            case StorageType.SearchCache:
                xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(List<List<dmWFDocumentHeader>>));
                break;
            case StorageType.FacebookProfile:
                xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmFBUserProfile));
                break;
            case
                StorageType.BaseUrl:
                xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFURLSetting));
                break;
            default:
                break;
        }
        xmlSerializer.Serialize(storageFile, ObjectToStore);
    }

}

And then here is my function to get from this storage :

public static dmWFURLSetting GetBaseUrl(StorageType Key)
{
    try

    {

        using (var storage = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication())
        {
            using (var storageFile = storage.OpenFile(Key.ToString(), System.IO.FileMode.Open, System.IO.FileAccess.ReadWrite))
            {
                dmWFURLSetting result = new dmWFURLSetting();
                var xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFURLSetting));
                return (dmWFURLSetting)xmlSerializer.Deserialize(storageFile);
            }
        }

    }
    catch (Exception)
    {
        return null;
    }

}

okay and then here is how i call these methods fromm front end and then viemodel, i am using mvvm fr this phone app. Frontend call :

public string URL = (WorkflowBase.BaseURL != null ? WorkflowBase.BaseURL.ToString() : "");

here is the public property in backend :

public static string BaseURL = AccTech.WP8.Helpers.IsolatedStorage.GetBaseUrl(Helpers.IsolatedStorage.StorageType.BaseUrl).BaseUrl.ToString();

okay so here comes the weird part, i know when i start the emulator after being closed completely the isolated storage(cache) is completely clean so if this function is called i will get a Null return... as you can see in my frontend call i made an inline if that if i get a null value, then make it "". so here is the error that i get when i run. PS: if i make the URL static the app works enter image description here

okay and here is the error i get when i try to step through the whole process :

enter image description here

i am physically unable to get this working i have tried everything google offers... but nothing happens , if someone can please give me an answer i will be delighted.

if you need more data or info please let me know

Check if dmWFURLSetting has the proper attributes for (de)serialization and a public constructor. — kindasimple

Arrie Arrie · Accepted Answer · 2013-04-17T11:31:22

WorkflowBase.BaseURL != null , this workflowbase class it was pointing to never changed the public variable to the data it got so that is why the error occoured! .

so yeah noob mistake of the week! :P

Isolated Storage not working on windows phone app

2 Answers