构造函数链接的目的？

这绝对是个好习惯，主要有两个原因：

避免代码重复

class Foo{    public Foo(String myString, Int32 myInt){        //Some Initialization stuff here    }    //Default value for myInt    public Foo(String myString) : this(myString, 42){}    //Default value for both    public Foo() : this("The Answer", 42){}}

实施良好的封装

public abstract class Foo{    protected Foo(String someString)    {        //important Stuff Here    }}public class Bar : Foo{    public Bar(String someString, Int32 myInt): base(someString)    {        //Let's the base class do it's thing        // while extending behavior    }}