Default Values Table (C# Reference)

默认值表（C# 参考）
https://msdn.microsoft.com/zh-cn/library/83fhsxwc(v=vs.120).aspx

The following table shows the default values of value types returned by the default constructors. Default constructors are invoked by using the new operator, as follows:

int myInt = new int();

The preceding statement has the same effect as the following statement:

int myInt = 0;

Remember that using uninitialized variables in C# is not allowed.

下表中有以下几点需要注意：

bool类型的默认值为false;

结构体中各字段的默认值由其类型确定，所有引用类型的默认值为null,而不是c++中的NULL