invalid nullable value enable for c# 7.3 : (solution step-by-step)

 The new feature __nullable help prevent the NullReferenceException that happens in C#. It is a new keyword in C# 7.3 that allows you to declare a variable or field as nullable.

The use of nullable is quite simple, you just need to append? to a type declaration, after which you can assign it to null. An example is as follows:

• Click on your project.
• "Properties" >> "Build" >> "Advanced" >> ".
• You'll see that Visual Studio lacks a UI for changing the value.
• Navigate to the csproj file.
• "Unload Project".

invalid nullable value enable for c# 7.3

I finally came up with a workaround that involved manually adding an entry for the Language Version to the project file. Therefore, I added LangVersion>preview/LangVersion> under the PropertyGroup> settings when I opened the Miniblog.Core.csproj file. It appears as follows:

error cs8630 invalid 'nullable' value 'enable' for c# 7.3

Code Analysis Error CS8630: Invalid 'nullable' value 'enable' for 'System.Boolean': cannot convert from 'System.Nullable{get; set;}' to 'System.Boolean'.

As of today, the answer to this question is “No,” but soon it will be “Yes!” The answer is exactly what the title of this answer says, “error cs8630 invalid ‘nullable’ value ‘enable’ for c# 7.3.” People are working hard to make it happen, but of course, it's not like they can just turn it on and have it work. The first public preview of C# 7.3 is expected to be released in the Spring of 2020, with a full release expected later in 2019 or early 2021.