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VisualizaçõesResolve compilation error “CS8601 Possible null reference assignment”
Since C# 8.0, the standard is non nullable variable by default. Ref1
But in case of generics like this one:
public static T PerfomIO<T>(Func<T> function, T defaultValue = default)
{
try
{
return function();
}
catch (IOException)
{
}
return defaultValue;
}
How to get rid of the compilation error "CS8601 Possible null reference assignement" that occur when I try to pass "default" ?
I want to support null value here. I do not want to disable the error message. I want to program it the way it should be.
I try to add Nullable in many ways without success. I try [AllowNull] without success
1 Respostas
Responde à pergunta0
I found a few tricks although I had no idea why the project was forced to "nullable check" (found and details below). I look in the .csproj, .sln and elsewhere and didn't find any parameter that could force the null check.
I found 2 ways to workaround the problem I had:
Solution 1: You can add the next line at the start of your .cs file:
#nullable disable
Solution 2: Change the parameter from
defaulttodefault!where the!tells the compiler not to consider the nullable check.
I currently use default!.
Also just as reference, if your project forces null check but you can't find the option in your project or in your solution, then look for this article: Customize your build, perhaps you will find why the null check is forced. (All new since 2019).