struct和class区别小结

A struct is similar to a class, with the following major differences: 

A class is a reference type, while a struct is a value type. Consequently, structs are typically used to express simple types, in which value-type semantics are desirable (e.g., assignment copies a value rather than a reference). 

A class fully supports inheritance , whereas a struct can inherit only from an object and is implicitly sealed (in the runtime structs actually inherit from System.ValueType). Both classes and structs can implement interfaces. 

A class can have a destructor, and a struct cannot. 

A class can define a custom parameterless constructor and initialize instance fields, while a struct cannot. The default parameterless constructor for a struct initializes each field with a default value (effectively zero). If a struct declares a constructor(s), then all of its fields must be assigned in that constructor call.