摘要： 我们先来看一个例子代码Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->classProgram{staticvoidMain(string[]args){BaseClassbaseClass=newDerivedClass();Console.WriteLine(baseClass.GetString());//DerivedClassdriverclass=newDerivedClass();//Console.WriteLine(driv 阅读全文