Question

所以我在使用C＃表单时遇到了一些麻烦。我创建了一个客户列表，其中存储了名称，郊区和银行帐户余额。使用下一个和上一个按钮我需要能够允许用户浏览列表中的当前5个对象。我计划这样做是因为当用户点击按钮时，文本框将填充相关信息。客户和其他细节是按钮的原因是，后来我需要能够更新存储在这些字段中的信息，所以我认为一个好方法是删除文本框中已有的内容，键入新的信息，然后按按钮进行更新。

无论如何，我的主要问题是我需要使用我的视图按钮来浏览我的列表

这就是我的表单的样子：

enter image description here

我目前的表格代码是：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        Customer c1 = new Customer("Sibel Yilmaz", "Wollongong", 2500, 3000, 5000);
        Customer c2 = new Customer("John Doe", "Figtree", 2547, 2500, 3655);
        Customer c3 = new Customer("Mariah Moore", "Coniston", 2500, 7000, 36000);
        Customer c4 = new Customer("Jessica Blackshaw", "Bellambi", 3500, 6000, 4750);
        Customer c5 = new Customer("Suzan Yilmaz", "Wollongong", 2500, 2000, 47110);

        List<Customer> customers = new List<Customer>();

        customers.Add(c1);
        customers.Add(c2);
        customers.Add(c3);
        customers.Add(c4);
        customers.Add(c5);
    }

    private void Form1_Load(object sender, EventArgs e) { }
    private void button2_Click(object sender, EventArgs e) { }
    private void button6_Click(object sender, EventArgs e) { }
    private void textBox4_TextChanged(object sender, EventArgs e) { }
    private void Customer_Click(object sender, EventArgs e) { }
}

我的Customer课程是：

public class Customer
{
    protected string name;
    protected string suburb;
    protected int postcode;
    protected double credit_balance;
    protected double saving_balance;

    public Customer(string name, string suburb, int postcode, double credit_balance,
                    double saving_balance)
    {
        this.name = name;
        this.suburb = suburb;
        this.postcode = postcode;
        this.credit_balance = credit_balance;
        this.saving_balance = saving_balance;
    }

    public string Name
    {
        get { return name; }
        set { name = value; }
    }

    public string Suburb
    {
        get { return suburb; }
        set { suburb = value; }
    }

    public int Postcode
    {
        get { return postcode; }
        set { postcode = value; }
    }

    public double Credit_Balance
    {
        get { return credit_balance; }
        set { credit_balance = value; }
    }

    public double Savinig_Balance
    {
        get { return saving_balance; }
        set { saving_balance = value; }
    }
}

请帮帮我，让我知道最好的方法是什么。

Answer 1

您需要做的第一件事是让您的客户列表具有类级别可见性，以便您可以在按钮单击事件中访问它。

public partial class Form1 : Form
{
    int index = 0;
    List<Customer> customers = new List<Customer>();
    public Form1()
    {
      ... The remainder of your Constructor code

一旦你这样做，你应该可以做这样的事情。

private void next_Click(object sender, EventArgs e)
{
    if (index < customers.Count - 1)
    {
        index += 1;
        textBox1.Text = customers[index].Name;

        ...
    }
}

private void previous_Click(object sender, EventArgs e)
{
    if (index > 0)
    {
        index -= 1;
        textBox1.Text = customers[index].Name;

        ...
    }
}

Answer 2

使用DataBinding，如果你需要更改某些字段的内容，你可以使用按钮来更新或简单地设置DataSourceUpdateMode，就像我在这里对OnPropertyChange一样，每当你更改其中一个文本框中的文本时它会更新数据源（在本例中为List）。您可以单独定义Binding对象，然后将其添加到textbox.DataBindings，以便您可以格式化和解析它，但在这里我只是为了演示目的而直接添加它们：

List<Customer> customers;

public Form1()
{
     InitializeComponent();

     //you could add the Customers directly to the add method of the list.
     Customer c1 = new Customer("Sibel Yilmaz", "Wollongong", 2500, 3000, 5000);
     Customer c2 = new Customer("John Doe", "Figtree", 2547, 2500, 3655);
     Customer c3 = new Customer("Mariah Moore", "Coniston", 2500, 7000, 36000);
     Customer c4 = new Customer("Jessica Blackshaw", "Bellambi", 3500, 6000, 4750);
     Customer c5 = new Customer("Suzan Yilmaz", "Wollongong", 2500, 2000, 47110);

     customers = new List<Customer>();

     customers.Add(c1);
     customers.Add(c2);
     customers.Add(c3);
     customers.Add(c4);
     customers.Add(c5);

     textBox1.DataBindings.Add("Text", customers, "Name",true,DataSourceUpdateMode.OnPropertyChanged);
     textBox2.DataBindings.Add("Text", customers, "Suburb", true, DataSourceUpdateMode.OnPropertyChanged);
     textBox3.DataBindings.Add("Text", customers, "Postcode", true, DataSourceUpdateMode.OnPropertyChanged);
     textBox4.DataBindings.Add("Text", customers, "Credit_Balance", true, DataSourceUpdateMode.OnPropertyChanged);
     textBox5.DataBindings.Add("Text", customers, "Savinig_Balance", true, DataSourceUpdateMode.OnPropertyChanged);
}

然后在上一个和下一个按钮中：

private void PreviousBtn_Click(object sender, EventArgs e)
{
    --this.BindingContext[this.customers].Position;
}

private void NextBtn_Click(object sender, EventArgs e)
{
    ++this.BindingContext[this.customers].Position;
}

使用下一个和上一个按钮浏览列表

2 个答案: