Question

我有一个名为Data的类，用于检索用户的数据

    class Data
    {
        public string firstName;
        public string lastName;
        public void getdata()
        {
            firstName = "ABC";
            lastName = "XYZ";
        }
        public static XDocument GetDataToXml()
        {
            var objget = new Data();
            objget.getdata();
            XDocument doc = new XDocument(
               new XElement("firstName ", objget.firstName),
               new XElement("lastName", objget.firstName));
            return doc;
        }
        public void display()
        {
            string fdata = firstName;  //i get "firstName"  value as null why????
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var obj = new Data();
            obj.getdata();
            obj.display();
            Console.ReadLine();
        }
    }

为什么在拨打disp()时我会获得空值，另外我只想访问firstName中lastName和GetDataToXml()的值，即使getData() paper.lines.get(this-1); 1}}函数被调用。尽管我将它赋值为public，但这个变量的范围是什么？

Answer 1

为了帮助你，我重新设计了你的例子：

class Program
{
    static void Main(string[] args)
    {
        var obj = new Data();
        obj.setData("First", "Last");
        obj.GetDataToXml();
        Console.ReadLine();
    }
}

class Data
{
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public void setData(string firstName, string lastName)
    {
        FirstName = firstName;
        LastName = lastName;
    }
    public XDocument GetDataToXml()
    {
        XDocument doc = new XDocument(
           new XElement("FirstName ", FirstName),
           new XElement("LastName", LastName));
        return doc;
    }
}

在GetDataToXML方法中放置一个断点并检查FirstName和LastName值。

Console C中同一类的不同方法中公共变量的范围是多少？

1 个答案: