抽象类和接口

问题描述

关于抽象类和接口的一些混淆。

抽象类与所有方法抽象和接口有什么区别？

例如

Some confusion about abstract class and Interface.
What is difference between a abstract class with all method abstract and Interface?
e.g

Interface IData
{
void Save();
}
abstract class AData
{
public abstratct void Save();
}

两者有什么区别？



接口如何比抽象类更安全？

为什么依赖注入始终优先使用接口而不是抽象类？

而在构造函数DI注入器中我们可以传递相同的抽象类作为接口的功能。

例如

What is difference between Both?

How Interface is more secure than abstract class?
Why dependency Injection always preferred to use Interface not abstract class ?
while in constructor DI injector we can pass abstract class which is same functionality as Interface.
e.g

--===For Interface
Interface IData
{
void Save();
}
public class Sql:IData
{
}
public class Oracle:IData
{
}
public class Client
{
IData _data=null;
Public Client(IData data)
{
_data=data;
}
}
--===For abstarct class
abstract class AData
{
public abstratct void Save();
}
public class ABSql:AData
{
}
public class ABOracle:AData
{
}
public class Client
{
AData _data=null;
Public Client(AData data)
{
_data=data;
}
}

两者有什么区别？

What is difference between both?

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