C#•3y ago

❔ Field / Property Initialized By Method

Hello, I could have sworn I read somewhere in the .NET API's that there was an attribute you could use to tell the compiler that a property was initialized by a certain method.

If anyone knows the name of the attribute I would be eternally greatful. I am creating a blazor wasm application. It is annoying to have to keep setting my component properties to { get; set; } = null! when they are being set by

OnInitialized

OnInitialized

OnInitializedAsync

OnInitializedAsync

Aaron•6/5/23, 4:47 AM

https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.codeanalysis.membernotnullattribute?view=net-7.0

MemberNotNullAttribute Class (System.Diagnostics.CodeAnalysis)

Specifies that the method or property will ensure that the listed field and property members have values that aren't null.

Aaron•6/5/23, 4:47 AM

I believe

Aaron•6/5/23, 4:48 AM

the actual property is nullable, then you place that attribute on a method, which will tell the code that it is no longer null after calling it

Aaron•6/5/23, 4:48 AM

the problem is, that analysis doesn't carry when you say, pass this class into another method

Aaron•6/5/23, 4:48 AM

so that context that you called the OnInitialized method and the value is no longer null is lost

mindhardt•6/5/23, 10:13 AM

For blazor components parameters specifically there is a which is meant to provide design-time warnings if the parameter was not set and supress null assignment warns

Accord•6/6/23, 10:39 AM

Was this issue resolved? If so, run

otherwise I will mark this as stale and this post will be archived until there is new activity.

NinshuOP•6/10/23, 3:28 PM

@Hin I was refering to a more general attribute not tied to an edit context.

@windows10ce thank you, I have been messing with that attribute as well as NotNull, it hasnt worked for me.

Aaron•6/10/23, 4:33 PM

yeah the properties themselves need to be nullable

Accord•6/11/23, 4:50 PM

Was this issue resolved? If so, run

otherwise I will mark this as stale and this post will be archived until there is new activity.