为什么这个静态bool不需要初始化？

Question

if you call checkBool, it will always return "why does this not fail"

Why is this and why do you not need to initialize _bool?

public sealed class falsefalse
{
    private static bool _bool;
    public static string checkBool()
    {
        if (!_bool)
            return "why does this not fail";
        else return "";
    }
}

Answer 1

Fields of class have their default values if you don't initialize them explicitly. Default value for type bool is false . See C# specification 10.4.4 Field initialization :

The initial value of a field, whether it be a static field or an instance field, is the default value (Section 5.2) of the field's type.

Take a look at Default Values Table (C# Reference)

Answer 2

Fields are automatically initialized to their default. default(bool) is false , so in this case - unless specified otherwise - _bool will be initialized to false .