c# - 我如何将信息从一种形式发送到另一种形式

Question

所以我正在为学校做一些事情，但我一直遇到问题，无法解决。我几乎完成了项目，但是我一直遇到这个简单的问题。所以首先我必须创建一个包含 5 个联系人的文件，包括每个联系人的信息。然后我将不得不使用类将联系人放入列表中。然后，当从列表中选择任何联系人时，将显示一个新表格以及每个人的信息。这是我到目前为止的代码: 主窗体

    public Form1()
    {
        InitializeComponent();
    }


    private void btnExit_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        lstNames.Items.Clear();
    }

    private void btnGetInfo_Click(object sender, EventArgs e)
    {
        {
            // Call methods
            FileRead();
            DisplayNameList();
        }
    }
    private void FileRead()
    {
        try
        {
            StreamReader inputFile;
            string line;
            char[] deliminator = { ',' };
            inputFile = File.OpenText("Accounts.txt");

            //While loop to move through the entries.
            while (!inputFile.EndOfStream)
            {
                //Use class
                PersonEntry entry = new PersonEntry();

                //Variable to hold line.
                line = inputFile.ReadLine();

                //Tokenize the line.
                string[] tokens = line.Split(deliminator);

                //Store the tokens in the entry object.
                entry.Name = tokens[0];
                entry.Email = tokens[1];
                entry.PhoneNumber = tokens[2];

                //Get the names in the list!
                nameList.Add(entry);
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("ERROR: Something went WRONG! " + " " + ex.Message);
        }
    }
    private void DisplayNameList()
    {
        //Add the entry objects to the List
        foreach (PersonEntry nameDisplay in nameList)
        {
            lstNames.Items.Add(nameDisplay.Name);
        }
    }

    private void lstNames_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (lstNames.SelectedIndex != -1)
        {
            //Get full info for the selected item in the list
            string name = nameList[lstNames.SelectedIndex].Name;
            string email = nameList[lstNames.SelectedIndex].Email;
            string phone = nameList[lstNames.SelectedIndex].PhoneNumber;


            //Create second form for these details
            Informationform form2 = new Informationform(name, email, phone);

            form2.ShowDialog();
        }
        else
        {
            MessageBox.Show("Please pick a name!");
        }
    }
}

我这里有第二种形式!

public partial class Informationform : Form
{

    public Informationform()
    {
        InitializeComponent();
    }

    public Informationform(string name, string email, string phone)
    {
        lblName.Text = name;
        lblEmail.Text = email;
        lblPhone.Text = phone.tostring();
    }


    private void Informationform_Load(object sender, EventArgs e)
    {

    }
}

这是我创建的类<​​/p>

class PersonEntry
{
    // Fields
    private string _name;   // The phone's brand
    private string _email;   // The phone's model
    private string _phonenumber;  // Retail price

    // Constructor
    public PersonEntry()
    {
        _name = "";
        _email = "";
        _phonenumber = "";
    }

    // Brand property
    public string Name
    {
        get { return _name; }
        set { _name = value; }
    }

    // Model property
    public string Email
    {
        get { return _email; }
        set { _email = value; }
    }

    // Price property
    public string PhoneNumber
    {
        get { return _phonenumber; }
        set { _phonenumber = value; }
    }
}

拜托，这让我发疯了，问题是每次我点击列表中的名字时，我都会得到一个异常错误，它是空的(应该是在标签中看到每个人的信息)!请看一下代码!提前致谢!

Answer 1

在接受参数的构造函数中，您需要调用 InitializeComponent();:

public Informationform(string name, string email, string phone)
{
    InitializeComponent();

    lblName.Text = name;
    lblEmail.Text = email;
    lblPhone.Text = phone.tostring();
}