C#. How to assign a bool variable certain value (not true and not false)?

Question

How to assign to a bool variable certain value (not true and not false)? I guess it can be so-called null state. But I'm not sure if it's correct guess. And I have no clue how to do that. Moreover, how to do that with possible further assignation (true/false)?

Answer 1

You need to declare a nullable boolean.

bool? x = null;

.NET Docs on nullable types

Answer 2

布尔值是一种值类型，如果要使用null进行初始化，则可以声明可为null的布尔变量，例如：

bool? x

Answer 3

That's right

Types that can be set to NULL are instances of the System.nullable structure.

T? variable = null;

troubleshooting

Cannot implicitly convert type 'bool?' to 'bool'. An explicit conversion exists (are you missing a cast?)

has already been answered here