CODEWITHSUNDEEP
windows-phone-7isolatedstorage
MaaN
MaaN

Reputation: 71

how to count row of isolated storage setting?

I stored multiple data in isolated storage setting but when retrive data at that time only one data is displayed

I use for loop but its not giving perfect out put

c# code is:


    for (int i = 0; i <= IsolatedStorageSettings.ApplicationSettings.Count; i++)
    {
      cityname = IsolatedStorageSettings.ApplicationSettings["CityDetail"] as string;
      ads.Add(new Transaction(cityname));
    }

saving code for isolated storage setting


 if (!setting.Contains("CityDetail"))
 {
   setting.Add("CityDetail", cityname);
 }
 else
 {
   setting["CityDetail"] = cityname; 
 }
 setting.Save();

Upvotes: 0

Views: 273

Answers (1)

Amresh Kumar
Amresh Kumar

Reputation: 1445

The Isolated Storage uses Key-Value pair to save data.
So for example if you do:


 if (!setting.Contains("CityDetail"))
 {
   setting.Add("CityDetail", "abc");
 }
 else
 {
   setting["CityDetail"] = "abc"; 
 }
 setting.Save();

So after doing this, the value for the key - CityDetail is abc.

After this if you do:


 if (!setting.Contains("CityDetail"))
 {
   setting.Add("CityDetail", "def");
 }
 else
 {
   setting["CityDetail"] = "def"; 
 }
 setting.Save();

Then, the value for the key CityDetail will be replaced and the new value will be def.
The essence is "In Key-Value storage method, there can be only one value for one key."

To save multiple values against a single key, you can do something like this:


void addCityName(string cityName)
{
    List<string> existingList = getCityNames();
        if(existingList==null)
        {
             existingList = new List<string>();
             existingList.Add(cityName);
        }
        string json = JsonConvert.SerializeObject(exitingList);
        if(!IsolatedStorageSettings.ApplicationSettings.Contains("CityDetails"))
    {
        IsolatedStorageSettings.ApplicationSettings.Add("CityDetails",json);    
    }
    else 
    {
        IsolatedStorageSettings.ApplicationSettings["CityDetails"] = json;
    }
}

List<string> getCityNames()
{
    string json = IsolatedStorageSettings.ApplicationSettings["CityDetails"] as string;
    if(json == null)
        return null;
    JArray arr = JArray.parse(json);
        List<string> list = new List();
    for(int i=0; i < arr.length; i++)
    {
        list.add(arr[i].toString());
    }
    return list;
}

For this you need the Json.Net library.

Upvotes: 1

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