C#•10mo ago

How to save data on WPF?

i am trying to make a wpf save data after closed, then when i reopen the wpf, i will see the data i had the last time i opened the wpf. is there a way to do this?

14 Replies

ACiDCA7•10mo ago

exactly like you wrote it.. eg. on close save all relevant data and when you open the program load that data again

Denis•10mo ago

Save to a file Preferably in %appdata% Use a C# class to describe what data you want to save Implement serialization of that class either to XML or json Research ways an app can close Determine when you want to save

oke•10mo ago

If you're new to C#, I'd suggest using Newtonsoft.Json. It allows you to serialize an entire class with a single function call. From there, you can dump it into a file and reopen it, then deserialize it at runtime. Example:

[Serializable]
internal class MyAppSettings
{
    public string CurrentUser { get; set; } = string.Empty;
    public int UserAge { get; set; } = -1;
    public List<string> GreatestFears { get; set; } = new();
}

...

public static void Main()
{
    // Save an instance of the class to file
    var settings = new MyAppSettings();
    string jsonString = JsonConvert.SerializeObject(settings);
    File.WriteAllText("path/to/settings/file", jsonString);

    // Load file
    var loadedJson = File.ReadAllText("path/to/settings/file");
    var newSettings = JsonConvert.DeserializeObject<MyAppSettings>(loadedJson);
    // Now you can use the loaded class in your app
}

[Serializable]
internal class MyAppSettings
{
    public string CurrentUser { get; set; } = string.Empty;
    public int UserAge { get; set; } = -1;
    public List<string> GreatestFears { get; set; } = new();
}

...

public static void Main()
{
    // Save an instance of the class to file
    var settings = new MyAppSettings();
    string jsonString = JsonConvert.SerializeObject(settings);
    File.WriteAllText("path/to/settings/file", jsonString);

    // Load file
    var loadedJson = File.ReadAllText("path/to/settings/file");
    var newSettings = JsonConvert.DeserializeObject<MyAppSettings>(loadedJson);
    // Now you can use the loaded class in your app
}

Denis•10mo ago

Isn't this also true for System.Text.Json? If they have polymorphism or other complicated settings, custom serializers and etc are still necessary for newtonsoft

oke•10mo ago

It is, but I use Newtonsoft more. Either one works perfectly fine.

Denis•10mo ago

I recommend system text json, as it comes with .NET No need to install a third party library

oke•10mo ago

touche

leowest•10mo ago

no its the other way around use System.Text.Json, Json.NET should only be used in very specific scenarios where 1) u dont control the json you receive and it contains things STJ cannot handle and 2) for options STJ does not support currently which aren't that many. On top of that the creators of STJ are the creators of Newtosoft that were hired by microsoft to create a better version of newtonsoft.

oke•10mo ago

Personally, I've never cared. They both serialize and deserialize Json, and that's all I've ever needed.

leowest•10mo ago

read from there https://discord.com/channels/143867839282020352/143867839282020352/1213072553749250048

MODiX•10mo ago

TeBeCo

string json = Encoding.UTF8.GetString(buffer);

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oke•10mo ago

Like using a bread knife and a chainsaw on sourdough interchangeably.

leowest•10mo ago

you will change your mind on why u should care in more reaons then u think

inactiveOP•10mo ago

i got a solution, thanks

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How to save data on WPF?