Question

我有以下课程;

    abstract class People
    {
    string name;
    bool disabled;
    string hometown;

    Hometown referenceToHometown;


    // default constructor
    public People()
    {
        name = "";
        disabled = false;
        hometown = "";
    }

我想向其添加数据，以便稍后在表单上显示 - 经过研究我得到了这个，但是我收到了一些错误“无效令牌'='”

namespace peoplePlaces
{
public partial class frm_people : Form
{
        List<People> people = new List<People>();

        People data = new ();
        data.name = "James";
        data.disabled = false;
        data.hometown = "Cardiff"

        people.Add(data);
}

}

这是否有一种更简洁的方法来向类中添加数据？这样做可以形成一个循环记录吗？

任何帮助都会非常感谢！

Answer 1

您可以使用静态方法执行此类初始化：

public partial class frm_people : Form
{
    List<People> people = CreatePeople();

    private static List<People> CreatePeople()
    {
        var list = new List<People>();

        People data = new People();
        data.name = "James";
        data.disabled = false;
        data.hometown = "Cardiff";

        list.Add(data);

        return list;
    }
}

当然，您的People类型必须是非抽象的，否则您将不得不创建非抽象派生类型的实例;现在你无法使用People创建new People()的实例，因为该类被标记为抽象。

如果您使用的是足够现代的C＃，则只能使用初始化结构：

public partial class frm_people : Form
{
    List<People> people = new List<People>() {
        new People() {
            name = "James",
            disabled = false,
            hometown = "Cardiff"
        }
    };
}

Answer 2

您正在尝试执行的操作的修订代码：

public class People
{
    public string Name { get; set; }
    public bool Disabled { get; set; }
    public string Hometown { get; set; }

    Hometown referenceToHometown;


// default constructor
public People()
{
    name = "";
    disabled = false;
    hometown = "";
}

public People(string name, bool disabled, string hometown)
{
    this.Name = name;
    this.Disabled = disabled;
    this.Hometown = hometown
}

您的网页代码：

namespace peoplePlaces
{
   public partial class frm_people : Form
   {
        // This has to happen in the load event of the form, sticking in constructor for now, but this is bad practice.

        public frm_people()
        {
        List<People> people = new List<People>();

        People data = new Person("James", false, "Cardiff");

        // or

        People data1 = new Person { 
          Name = "James", 
          Disabled = false, 
          Hometown = "Cardiff"
        };

        people.Add(data);
        }
   }
}

Answer 3

您的People类看起来可能是您在C＃中的第一个类。您应该从小处着手，只在需要时添加功能：

class People
{
  string Name { get; set; }
  bool Disabled { get; set; }
  string Hometown { get; set; }
  Hometown ReferenceToHometown { get; set; }
}

然后你可以这样称呼它：

People data = new People() { Name = "James", Disabled = false, Hometown = "Cardiff" };

如果需要抽象类和构造函数，则应在需要时添加它们。

c＃List <class> Additions </class>

3 个答案: