Browse questions answered by Jon Skeet

Convert json object to model if that object is dynamic

I need the solution to convert json object to model if that object is number and i want to access the fields of that object. {"threaded_extended": { "857334186": [ { "id":...

Your question is somewhat unclear, but I suspect I see the pattern - the value of threaded_extended is effectively a Dictionary<int, List<Post>> or similar. So that's how you should represent it: public class Root { ... more 5/12/2017 6:03:43 AM

Ordering a string list by an index list in c#

I have two list, one contains string data and the second one contains some index numbers. List<int> myIndexList = new List<int>() {4, 3, 1, 2, 5,...

I think you just want: var orderedByIndexList = myIndexList.Select(index => myValuesList[index]); If you need it as a List<T>, put .ToList() at the end. Note that this doesn't modify myValuesList - it just creates a new... more 5/11/2017 2:48:07 PM

Convert string to json doesn't work java

I have a problem with convert string to json. Namely, my json string is: {"serverId":2,"deviceId":736,"analysisDate":"2017-05-11T07:20:27.713Z","eventType":"Logs","eventAttributes":[{"name":"level","value":"INFO"},{"name":"type","value":"Video Blocked On"},{"name":"cameraId","value":"722"},{"name":"userId","value":"1"}]} My code: try { JSONObject object = new JSONObject(jsonString); JSONArray array = object.getJSONArray("eventAttributes"); System.out.println("ARRAY: " + array); for (int i = 0; i < array.length(); i++) { JSONObject obj = new JSONObject(array.getJSONObject(i)); System.out.println("OBJ: " + obj); } } catch (JSONException ex) { Exceptions.printStackTrace(ex); } System.out.println array is: [{"name":"level","value":"INFO"},{"name":"type","value":"Video Blocked On"},{"name":"cameraId","value":"722"},{"name":"userId","value":"1"}] but if I print obj is "{}", four times. So it is correct, because array has 4 elements, but why it is empty object? I'm using org.json. Thanks

You're calling the JSONObject(Object) constructor, passing in a JSONObject (the element in the array). That constructor is documented as: Construct a JSONObject from an Object using bean getters. It reflects on all of the public... more 5/11/2017 6:01:36 AM

Converting String to UTF 8 byte array returns a negative value in Java

Let's say I have a byte array and I try to encode it to UTF_8 using the following String tekst = new String(result2, StandardCharsets.UTF_8); System.out.println(tekst); //where...

Answering the specific question Does that mean that my byte still contains negative values despite converting it to UTF-8? Yes, absolutely. That's because byte is signed in Java. A byte value of -61 would be 195 as an unsigned value.... more 5/10/2017 8:34:29 AM

Why does thread.join freezes the UI in vb.net

I am trying my hand on multi threading. After creating the threads my UI seems to freeze as i am trying to join the created threads. If i dont join my threads then everything...

You're calling Thread.Join from the UI thread. That means the UI thread is blocked until all the other threads complete. That's a bad idea in general as it means your UI is blocked while all the other threads do work. In this case it's... more 5/10/2017 7:14:39 AM

null shorthand in C#?

Is there a way to make this line shorter? bool pass = d != null && d["k"] != null && (bool)d["k"]; Note: "k" is actually "a longer id"; I replaced it to make it...

A combination of the null-conditional and null-coalescing operators should work here: bool pass = (bool) (d?["k"] ?? false); To clarify: If d is null, d?["k"] is null If d?["k"] is null, d?["k"] ?? false is false (boxed as object) The... more 5/9/2017 7:02:45 AM

Unix timestamp function not returning expected timestamp, wrong timezone?

I'm using a custom function to take the current date and subtract days on it then return a timestamp in unix format. All the conversions are working fine except the expected...

You're calling the DateTime constructor without specifying a Kind, then you're calling ConvertTimeToUtc. That's going to assume that dateTime is actually local, and convert it to UTC. Given that you're already constructing it with UTC... more 5/8/2017 6:01:15 PM

Specific Elements from an XML document

I have the following XML: <?xml version="1.0" encoding="utf-8" ?> <catalog> <books> <book id="bk101"> <author id="1">Gambardella,...

Currently you're trying to fetch a price element directly under book, so that's not going to work to start with. Next you want to only select the price element with the right country sub-element Finally, you don't want the value of the... more 5/8/2017 8:51:02 AM

gradle javadoc fail on UTF 8 chars, only on windows

So i have a gradle based java project, with tons of hungarian docs string, witch mean a lot of non ASCII character. It's perfectly fine since javac consume utf-8 characters in...

I suspect you want options.encoding = 'UTF-8' That would fit with the javadoc help text of: -encoding <name> Source file encoding name ... whereas charSet appears to affect the output. (I'd hope it would default... more 5/8/2017 8:37:35 AM

Why is an async method with await keyword still blocking the main thread?

Can anyone explain to me the difference between these 2 async methods? Method A public async Task<List<Thumbnail>> GetAllThumbnailsAsync() { return await...

Method A is basically executing everything in a separate task, which will probably end up in a new thread. When you await the resulting task, you won't block anything. Method B starts by calling GetAllDirectoriesWithImageAsync, and awaits... more 5/8/2017 7:02:11 AM