The difference between abstract methods and virtual methods in C #

People who have studied C # should know both abstract and virtual methods, and many beginners don't know much about the difference between them. Today this article is to analyze the difference between the two. And an example is attached to illustrate. The specific analysis is as follows:

First, the main difference:

For abstract methods, subclasses must implement it

。

For virtual methods, subclasses can override or not override

。

So

The two constraints are different

Second, the example code is as follows:

/* Declare an abstract class * 1. The abstract class can contain variables * 2. Method body */abstract Class absclass{string name cannot be declared in abstract method  ;  public abstract void Displayvalue (string value);} /* Subclass inheriting abstract class must implement abstract method */class absclassinherited:absclass{/  * Use override override to implement */public  override void Displayvalue (String value)  {    Console.WriteLine (value. ToUpper ());}  } /* Declare virtual function */class virtclass{  /* Declares a virtual function   virtual function must implement method body *  /public virtual void Displayvalue (string value)  {    Console.WriteLine (value);  }} /* Virtual method can be implemented or not implemented */class virtclassinherited:virtclass{/  * Use override override to implement */public  override void Displayvalue (string value)  {    Console.WriteLine (value. ToUpper ());}  } /* Declare an interface * 1. The methods in the interface must be public * 2. The variable is not allowed in the interface * 3. Methods in the interface do not allow method body */interface iabs{  void Displayvalue (string value);}

I hope the analysis of this article will be helpful to everyone's C # program design.

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The difference between abstract methods and virtual methods in C #

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The difference between abstract methods and virtual methods in C #