CODEWITHSUNDEEP
c#.netjsonfileuwp
SuperJMN
SuperJMN

Reputation: 14002

Using JSON.NET to write Json file in UWP

I'm pretty new to file handling in UWP, and it feels really intricate. I don't know how to start. I thought about "learn by doing": I failed miserably.

The goal: I would like store an object into a Json file, into a well known location. My object is of type "MySettings" and I would like to save it, for instance, to "ms-appx:///myconfig.json".

How can I do it?

Another question: will this file be editable from outside my application easily, like in classic Desktop applications? I thought about editing the settings with a text editor, for changing settings quickly without rebuilding my app.

Upvotes: 1

Views: 3672

Answers (1)

Jay Zuo
Jay Zuo

Reputation: 15758

ms-appx:/// represents app's install directory which is read-only. So we can't a store Json file in such location. I'd suggest you store Json files in application data locations such as app's local data folder (ms-appdata:///local/). For more info, please see File access permissions. And following is a simple sample with using Json.NET:

Product product = new Product();
product.Name = "Apple";
product.Expiry = new DateTime(2008, 12, 28);
product.Sizes = new string[] { "Small" };

// serialize JSON to a string
string json = JsonConvert.SerializeObject(product);

// write string to a file
var file = await ApplicationData.Current.LocalFolder.CreateFileAsync("myconfig.json");
await FileIO.WriteTextAsync(file, json);

Once the file is stored, you should be able to find it under
%USERPROFILE%\AppData\Local\Packages\{Package family name}\LocalState folder and you can edit it with a text editor easily. For more info, you may refer to my previous answer here.

Upvotes: 6

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