C#•2mo ago

✅ Deserialize JSON back into custom object

Hey all, I have an ObservableCollection that I am using to store a list of tasks (A custom object "TaskItem" that is build like this.

c#

    internal class TaskItem {

        public string Task { get; set; }
        public string Description { get; set; }
        public string Date { get;  }

        public TaskItem()
        {
            Date = DateTime.Now.ToString("hh:mmtt dd/MMM/yyyy");
        }
    }

c#

    internal class TaskItem {

        public string Task { get; set; }
        public string Description { get; set; }
        public string Date { get;  }

        public TaskItem()
        {
            Date = DateTime.Now.ToString("hh:mmtt dd/MMM/yyyy");
        }
    }

And in my ViewModel I'm creating an ObservableCollection of those item types, called "TaskList". I am exporting that list of TaskItems to Json and that works fine with the below:

c#
            string json = JsonConvert.SerializeObject(TaskList);
File.WriteAllText(SavePath, json)

c#
            string json = JsonConvert.SerializeObject(TaskList);
File.WriteAllText(SavePath, json)

But I can't seem to work out how the hell I load that back into TaskList variable when I re-open the app. I have been messing around with this in the ViewModel constructor:

c#
string loadedJSON = File.ReadAllText(SavePath);
TaskList = JsonConvert.DeserializeObject<TaskItem>(loadedJSON);

c#
string loadedJSON = File.ReadAllText(SavePath);
TaskList = JsonConvert.DeserializeObject<TaskItem>(loadedJSON);

Trieda bunch of different stuff in there, this was just what I gave up on haha. Am I at least getting close? haha.

4 Replies

Kouhai•2mo ago

You can just do JsonConvert.DeserializeObject<ObservableCollection<TaskItem>>(loadedJSON);

intee_•2mo ago

Legend, thanks heaps mate! Is that going to create a new TaskList object or use the one that is being declared in the constructor above it? This is also in the constructor:

c#
TaskList = new ObservableCollection<TaskItem>();

c#
TaskList = new ObservableCollection<TaskItem>();

Oh, never mind. Got it! Thanks heaps mate, I never tried the <ObservableCollection<TaskItem>> I tried <ObservableCollection><TaskItem> -.-

Kouhai•2mo ago

DeserializeObject<ObservableCollection<TaskItem>>(loadedJSON) will create a whole new ObservableCollection<TaskItem> and won't reuse the previously created collection :ThumbsUp:

intee_•2mo ago

I just threw TaskList = on the front and it seems to be loading the json into my datagrid haha 😛

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✅ Deserialize JSON back into custom object