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- derived type conversion 导出类型转换
- Thrown when an explicit conversion from a base type to an interface or to a derived type fails at runtime. 当从基类型到接口或派生类型的显式转换在运行时失败时,就会引发此异常。
- This last conversion is widening because the derived type contains all the members of the base type and thus is an instance of the base type. 最后一个转换为扩大转换,因为派生类型包含基类型的所有成员,于是为基类型的一个实例。
- Property will return the name of the derived type that extends the. 类的派生类型的名称。
- Automatic data type conversion is not supported for the. 数据类型进行自动数据类型转换。
- Conversions from derived type to base type are allowed. 允许从派生类型型到基类类型的转换。
- Values, you do not have late binding or type conversion. 值进行泛型化,因此,不会有后期绑定或类型转换。
- It might seem surprising that a conversion from a derived type to one of its base types is widening. 从派生类型到它的基类型的转换正在扩大,这看起来可能让人吃惊。
- The operator symbol is always CType Function for a type conversion operator. 类型转换运算符的符号总是CType函数。
- In these cases, a default value is returned from the type conversion function. 在这些情况下,类型转换函数将返回一个默认值。
- Methods to perform the type conversions. 方法以执行类型转换。
- Built-in types include both primitive types and derived types. 内置类型包括基元类型和导出类型。
- Shows how to do an upcasta cast from a derived type to one of its base classesusing. 执行向上转换,即从派生类型强制转换为它的一个基类。
- Casting allows you to make this type conversion explicit, or to force it when it wouldn't normally happen. 通过造型,我们可明确设置这种类型的转换,或者在一般没有可能进行的时候强迫它进行。
- In the opposite direction, the base type does not contain any new members defined by the derived type. 在相反的方向,基类型不包含由派生类型定义的任何新成员。
- Designers of a base class can anticipate the aspects of their base class that are likely to change for a derived type. 基类的设计者可以预测到其基类中可能会在派生类中发生更改的方面。
- Define the type conversion as a CType Function procedure within the class or structure. 将类型转换定义为类型或结构中的CType函数过程。
- For example, to override a field or property, create an XmlElementAttribute, using the new, derived type. 例如,若要重写字段或属性,则使用新的派生类型创建XmlElementAttribute。
- Gets or sets a value indicating whether type conversion and formatting is applied to the control property data. 获取或设置一个值,该值指示是否对控件属性数据应用格式设置。
- Derived types must be completely substitutable for their base types. 派生类型必须是它们的基础类型完全可替换的。