Browse questions answered by Jon Skeet

Empty array in string breaking deserialization

I have a string of JSON that I'm trying to convert into a list. There is an empty array value which is breaking the deserialization (have tried removing it manually or changing to...

The value is an array, but your field is a string. I suggest you make it an array (or list) of the appropriate type - we can't tell what that type would be from your JSON, but perhaps you want a string array? I'd also suggest using... more 5/25/2017 4:29:20 PM

Decryption using Aes fails

I am using this function to encrypt data in my UWP project: public string Encrypt(string text, string key) { byte[] buffer = Encoding.UTF8.GetBytes(text); ...

The problem is what you're doing with the end of the decryption: return Convert.ToBase64String(buffer); You actually want to convert the decrypted binary data back into a string in a way that mirrors the original way you converted it... more 5/25/2017 12:42:22 PM

Operator '?' cannot be applied to operand of type 'T' (2)

I came across a weird behavior of C# compiler (VS 2015). In the code bellow, compiler is happy with Value2, but complains about Value1: Operator '?' cannot be applied to operand...

I believe the problem is that the compiler can't know the type of the expression _valueProvider?.Value. Let's simplify this a bit: public interface IValueProvider<T> { T Value { get; } } public class Test { public static... more 5/25/2017 7:38:58 AM

.net core / standard string.ToLower() has no culture parameter

In .net fx i can do myString.ToLower(frenchCulture); But when looking at .net core or .net standard there is no more a culture parameter that can be passed. There is only...

It looks like the capability is there, just in a more roundabout way. Instead of: string output = input.ToLower(culture); use string output = culture.TextInfo.ToLower(input); Also note that the overload has been added in... more 5/24/2017 10:51:16 AM

Parsing Json to zoned date time

Im reciving following json time format "TimeEnd": "2017-05-24 09:52:51+02:00" my dto is as follows: @JsonProperty("TimeEnd") @JsonDeserialize(using =...

You shouldn't be trying to parse it as a ZonedDateTime, as it really doesn't have a time zone - it has a UTC offset. OffsetDateTime is more appropriate here. It's worth differentiating between the two types - you can create a ZonedDateTime... more 5/24/2017 10:24:38 AM

In java.time.Period class, what are the purposes of withDays(), withMonths(), withYears()

I noticed that the java.time.Period class contains a few instance methods that behave the same as the available static factory methods. .withDays() behaves the same as...

You made an unfortunate choice to test with, basically - "weeks" isn't an independent unit; it's just a shorthand for 7 days. From the docs for ofWeeks: The resulting period will be day-based, with the amount of days equal to the... more 5/24/2017 10:06:48 AM

Java main method not found error on Windows 10 even with correct main signature

I have a couple of Java files A.java and B.java that use a common jar file C.jar. B.java contains reference variables to the object of type A. B.java contains the main method I...

Am I making some mistake in my commands? Yes - you're not including anything apart from C.jar when trying to run. Use java -cp C.jar;. // Windows java -cp C.jar:. // Unix So that you're including the current directory (which is... more 5/24/2017 7:46:34 AM

how to convert optional parameter method to delegate in c#

i have a casting problem. public void Test(int a = 0) { } System.Action d = Test; this code works well in unity 5. but visual studio 2015 can't compile it. CS0123 No...

I'm surprised it works in Unity - it shouldn't. That sounds like a Mono compiler bug. The C# 5 specification isn't as clear on this as it should be, but from the draft of the upcoming ECMA C# 5 standard, from the clause on method group... more 5/24/2017 6:06:34 AM

Java Regex to replace Octal value in string

I have set of octal values say (0177-0377). whenever these value I found in string, have to replace with ?. String a= "sccce¼»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕerferferfer"; for...

You don't want to do this to the whole file in one go - you need a streaming approach. I'd do something like this: // TODO: Rename to something more appropriate public static void replaceInvalidCharacters(Reader reader, Writer writer) { ... more 5/23/2017 1:33:50 PM

How to convert the Date format and store it in a Date field(not in string or println) with the new format in Java

I'm trying to get the date from an object and changing the format and down the line I need to use the date value as a date field itself(not as string). The format is getting...

A Date object doesn't have any state representing a format. It's just an instant in time. If you've got the right value in date1, then formatting and parsing it is completely pointless. Instead, when you want the Date in a particular... more 5/23/2017 12:25:55 PM