Questions tagged [non-nullable]
232 questions
2
votes
0 answers
C# 8's non-nullable references fields in structs
Is this a hole in C# 8's NNR checks?
public struct V
{
private readonly double[] data;
public V(int size) => data = new double[size];
public int Length => data.Length;
}
var v = new V();
Console.WriteLine(v.Length);
I thought the…
Ian Marteens
- 49
- 4
2
votes
1 answer
How do I get a Non-Nullable T in C# to use it in a function?
got an error in this code.
private void Save(string file)
where T : struct, IPixel
{
Image image = Image.LoadPixelData(
_image.Data, _image.Width, _image.Height);
image.Save(file);
…
Björn Nickel
- 23
- 4
2
votes
1 answer
Non-nullable default return null warning
In C#8 we can now enable nullables, which means that reference types by default are considered not null by the compiler unless explicitly declared as nullable. Yet, it seems the compiler still throws a warning when trying to return a default generic…
HotN
- 4,216
- 3
- 40
- 51
2
votes
0 answers
Enable the nnbd experiment in pana and on pub.dev
I published a package and get a devastating health result from the pub server with the error message:
This requires the 'non-nullable' experiment to be enabled.
Actually, that's what I did!
I did enable the nnbd experiment in my…
user3464741
2
votes
1 answer
C# 8.0 Non Nullable Types compatible Classic NetFramework (4.X)
I am starting a new Project with Blazor Asp.NET Core 3.1 and all the cool new shiny fancy stuff. But for one interface to a client I still need a solution that supports WCF and thereby supports net framework 4.8.
So if I set my api Project (so far…
Michael P
- 241
- 3
- 8
2
votes
2 answers
kotlin - remove nullability from class properties
I have a class with some nullable properties
data class RequestModel(
val description: String?
)
and a validation function
fun validate(model: RequestModel): RequestModel{
if(model.description == null) throw…
Fartab
- 4,725
- 2
- 26
- 39
2
votes
1 answer
Testing a non-null parameter in Kotlin
new to Kotlin here!
I just switched some Java testing code into Kotlin and a specific case of null codes is bugging me for the moment. I am trying to test (in a Kotlin @Test code segment) whether this java function raises the right…
Samuel Otis
- 21
- 3
2
votes
1 answer
react-native-camera error when compiling android - cannot find symbol class NonNull
package.js
...
"react": "16.8.3",
"react-native": "0.59.5",
"react-native-camera": "git+https://git@github.com/react-native-community/react-native-camera.git"
...
settings.gradle
include ':app'
include…
Anderson Carvalho
- 25
- 8
2
votes
2 answers
Non-nullable ID with spring-data-mongodb in Kotlin
Is there any chance to make the @Id property non-nullable for Mongo-related entities in Kotlin?
Referring to this post there seems to be a solution for SQL by setting the ID initially to 0. However, that seems like a hack, and seems to work only…
Jan B.
- 6,030
- 5
- 32
- 53
2
votes
1 answer
Why does Eclipse JDT Null-Checking respect Apache Commons Validate
I use @NonNull-Checking with Eclipse-JDT and was very pleased to see that it understands and respects the use of Apache Commons Validate. Which means in code:
Validate.notNull(someInput);
@NonNull String a = someInput;
Without the first line the…
groovedigga
- 233
- 3
- 13
2
votes
1 answer
Kotlin - How to prevent null gets into Map object during jackson Json deserialization?
Firstly let me past some runnable code to help you get the issue I want to solve:
(maven dependency to include if you want to run this example code)
com.fasterxml.jackson.module
…
Fuyang Liu
- 1,496
- 13
- 26
2
votes
3 answers
Non-Nullable Virtual Propery in Entity Framework Code-First Model
I need to generate two database tables with a one-to-many relationship from my site's Entity Framework models; Blog and Tag. A blog can have many tags but a tag can only belong to one blog.
My Blog model consists of an ID property (Guid) as a…
Jonny
- 29
- 3
2
votes
1 answer
How do I use Java collections of non-nullable elements from Kotlin?
Using the interop automatisms Kotlin has for nullability, a method like this gets the proper signature in Kotlin:
@NonNull
public String foo(@NonNull String bar) {
return "bar";
}
Now lift the principle to collections (or other generics, I…
Raphael
- 9,779
- 5
- 63
- 94
2
votes
1 answer
NSError** 'Potential null dereference.....'
Giving the following example:
- (BOOL) doSomething: (NSError**) pError
{
*pError = [NSError ....];
}
Analyzer will return the following error:
Potential null dereference. According to coding standards in 'Creating and Returning NSError…
Kyle
- 17,317
- 32
- 140
- 246
2
votes
1 answer
Can't avoid Intellij throwing IllegalArgumentException with @NotNull
Is there anything else I can do when unchecking "Add runtime assertions for not-null annotated methods and parameters" doesn't work? It keeps throwing IllegalArgumentException. I've also tried disabling the Inspections for @NotNull/@Nullable…
garci560
- 2,993
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