c# - C#为类和运算符分配默认属性=

问题一:

我有一个简单的winforms应用程序，我想将Person.Name属性绑定(bind)到文本框。名称的类型为StringField。我最初将Name属性定义为String。数据绑定(bind)在诸如String之类的值类型上非常有用。我希望StringField.Value属性是StringField的默认属性。我想在文本框中而不是文本“FieldApp.StringField”中看到StringField.Value的值。

问题2:

我希望能够使用运算符=将字符串分配给StringField。此分配将导致设置StringField.Value成员。

能做到吗？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace FieldApp
{
    public class StringField
    {
        public string Value { get; set; }
    }

    public class Person
    {

        //private String _Name;
        //public String Name
        //{
        //    get { return _Name; }
        //    set { _Name = value; }
        //}

        //public Person(string name)
        //{
        //    Name = name;
        //}

        private StringField _Name;
        public StringField Name
        {
            get { return _Name; }
            set { _Name = value; }
        }

        public Person(string name)
        {
            Name = new StringField();
            Name.Value = name;
        }
    }

    public partial class FieldAppForm : Form
    {
        Person person = new Person("steve");

        public FieldAppForm()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //our form contains a button1 and textBox1

            //this compiles
            person.Name.Value = "steve";

            //this does not. Is there anyway to accomplish this?
            person.Name = "steve";

            //steve appears in the textbox
            textBox1.DataBindings.Add("Text", person, "Name.Value");

            //FieldApp.StringField appears in the textbox
            textBox1.DataBindings.Add("Text", person, "Name");
        }
    }
}

最佳答案

您可以创建一个隐式运算符重载。然后，您可以像这样从字符串创建StringField:

StringField field = "value of new object";
string value=(string)field;

知道这将创建一个新的StringField对象。我不一定会建议您这样做。

[System.Diagnostics.DebuggerDisplay("{Value}")]
public class StringField
{
    public string Value { get; set; }
    public static implicit operator StringField(string s)
    {
        return new StringField { Value = s };
    }

    public static explicit operator string(StringField f)
    {
        return f.Value;
    }
    public override string ToString()
    {
        return Value;
    }
}