Question

namespace To_Do_List_Application
{
    public partial class Create_new_task : Form
    {
        public Create_new_task()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            Data[] add_item = new Data[10];


            add_item[1] = new Data(Title_Input);
// I get the error Data does not contain constructor that takes 1 argument


        }


// Data Class on program.cs ////////////////////////////////////////////////////////////////

public class Data
    {
        // Menu (form)
        public int Priority;
        public string Title;
        public string Description;


        // Create new task (form)
        public DateTime Calender;
        public string Description_2;
        public int Tick;
        public Data(int priority, string title, string description, DateTime calender, string description_2, int tick)
        {
            // Menu (form)
            Title = title;
            Description = description;

            // Create new task (form)
            Calender = calender;
            Description_2 = description_2;
            Tick = tick;
            Priority = priority;

    }

Answer 1

当你尝试创建新的Data对象时，你必须使用带有6个参数的构造函数。在你的情况下，你的代码看起来应该是这样的：

add_item[1] = new Data(5,"title", "description", new DateTime(2015, 4, 25), "desc2",3);

通过构造函数创建一个新对象：

public Data（int priority，string title，string description，DateTime calender，string description_2，int tick）

是您的构造函数，您只能使用这6个参数创建一个新的数据对象。

Answer 2

您获得的错误是因为当您未提供接受单个参数的签名时，您尝试使用单个参数初始化新的Data对象：

add_item[1] = new Data(Title_Input);

将重载的构造函数添加到Data类，该类接受一个Title_Input类型的参数，您不应该再遇到该问题。

EG。

// Default constructor (This constructor is provided automatically by
// default if not explicitly defined. Including it in the class definition
// allows you to initialize the object with default parameters when creating
// a new Data object without providing any parameters.)
public Data()
{
}

// Overloaded constructor that accepts a single parameter
public Data(Title_Input input)
{
    //Do something with the parameter input
    ...
}

// Overloaded constructor that accepts 6 arguments
public Data(int priority, string title, string description, DateTime calender, string description_2, int tick)
{
    // Menu (form)
    Title = title;
    Description = description;

    // Create new task (form)
    Calender = calender;
    Description_2 = description_2;
    Tick = tick;
    Priority = priority;
    ...
 }

我试图从第二个表单添加用户输入标题，描述到我的数据阵列，但不能

2 个答案: