How to save a list of objects in UWP?

Question

I have a list of objects with class attributes in my UWP app. How do I save the list of objects so that they are still there when the user closes the program?

Answer 1

In general, we often serialize the object then store to the local store with Json.NET

var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
var list = new List() ;
for (int i = 0; i < 15; i++)
{
    list.Add(new People { Name = $"Nico{i}", Age = i + 1 });
}

string json = JsonConvert.SerializeObject(list);
// Create a simple setting.
localSettings.Values["exampleList"] = json;

// Read data from a simple setting.
Object value = localSettings.Values["exampleList"];
var ReList = JsonConvert.DeserializeObject > (value.ToString());

Answer 2

If the object is too big, save it to LocalSettings will throw an exception. A safe method is create a file in LocalFolder and save to it, we will convert object to text using JsonConvert.SerializeObject

Write Data

StorageFile sampleFile = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
await Windows.Storage.FileIO.WriteTextAsync(sampleFile, JsonConvert.SerializeObject(list));

Read Data

StorageFolder folder = Windows.Storage.ApplicationData.Current.LocalFolder;
StorageFile file = await folder.GetFileAsync(fileName);
var text = await FileIO.ReadTextAsync(file);
var object = JsonConvert.DeserializeObject(text)