Property Set和Property Let有什么区别？？？

hongbo163 2004-08-11 05:09:13

不都是给属性赋值的语句过程么？？

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flyingZFX 2004-08-12

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Let 对一般属性

Set 是对(object对象)的

chenyu5188 2004-08-12

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Property Let主要用于一般数据类型的属性过程

Property Set主要用于对象类型的属生过程

hongbo163 2004-08-11

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我自己测试了一下
Property Let是针对一般的属性
Property Set是针对object属性

In this article I want to discuss the lazy loading mechanism provided by NHibernate. It is recommended for maximum flexibility to define all relations in your domain as lazy loadable. This is the default behavior of NHibernate since version 1.2. But this can lead to some undesired effects if querying your data. Let's discuss these effects and how to avoid them. Term Paper AND Research Paper In my previous posts I showed how to prepare your system for NHibernate and how to implement a first NHibernate base application. This post is based on those two articles. Thesis AND Dissertation AND Essay The Domain Let's first define a simple domain. It shows part of an order entry system. I keep this model as simple as possible (a real domain model would be more complex) but it contains all aspects we want to discuss in this post. Below is the class diagram of our model We have an order entity which can be placed by a customer entity. Each order can have many order line entities. Each of the three entity types is uniquely identified by a property Id (surrogate key). The Mapping Files We have to write one mapping file per entity. It is recommended that you always have one mapping per file. Don't forget to set the Build Action of each mapping file to Embedded Resource. People often tend to forget it and the subsequent errors raised by NHibernate are not always obvious. Also do not forget to give the mapping files the correct name, that is *.hbm.xml where * denotes the placeholder for the entity name. The mapping for the Order entity might be implemented as follows <property name="OrderNumber"/> <property name="OrderDate"/> <set name="OrderLines" cascade="all-delete-orphan" >

set>

Analogous you can implement the mappings for the Customer entity <property name="CompanyName"/> and finally the mapping for the OrderLine entity.

<property name="Amount"/> <property name="ProductName"/>

Property Let 是用来设置属性值的。
Property Set 是用来设置对象引用的。
Property Get 是用来获取属性值的。
在这里假设name是类NewsClass的一个属性，调用为set News = new NewsClass
News.name = "news_class" 这里就调用了Public Property Let name这个name属性，let是让用户初始化name变量,一般用来初始化或重新设置类中的变量

Set 语句将一个对象赋值给一个变量，使其指向该对象,将对象引用赋给变量或属性。语法 Set objectvar = {[New] objectexpression | Nothing} Set 语句的语法包含下面部分：部分描述 objectvar 必需的。变量或属性

Let 赋值:为变量(字段)设置一个值(数值、字符串、布尔值)。例:Obj.Propertyname = x 'Let语句经常被调用，因为我们通常会将一个对象的属性设为一个值。 Set 赋值:为变量(字段)设置一个对象(引用)。例:Obj.Propertyname = Document.Form.Input 'Set语句很少被调用，因为我们很少会将一个对象的属性设为一个对象(但仍应保留，以防...

Let与Set的区别 1、在“类模块”中 Property Let 语句在Class块中，是给普通变量进行赋值操作的Property，该种Property将不能在其前面使用Set，因而将不能用户对对象变量的赋值。 Property Set 语句在Class块中，是给对象变量进行设置引用操作的Property。 Property Get 语句 ...

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