Question

我很新，你可以在我的编程中看到，我正在制作一个简单的程序练习。我想举例说明Item.price＆amp; Item.Name到Listbox2。

是否可以将arrayName放入变量并将其放入foreach循环中？只是为了防止很长的IF循环或开关，或者是一个while循环。

For example : 
    Array variable = Drinks;
    foreach(Product item in VARIABLE)
                        {
                            listBox2.Items.Add(item.ProductName + item.Price);
                        }

Ps：我已尝试使用临时列表，您将drinkList放入临时列表，然后将其命名为product.Name和/或Product.price。

public partial class Form1 : Form
{
    List<Product> Drinks = new List<Product>() {new Product("Coca Cola", 1.2F), new Product("Fanta", 2.0F), new Product("Sprite", 1.5F) };
    List<Product> Bread = new List<Product>() { new Product("Brown Bread", 1.2F), new Product("White Bread", 2.0F), new Product("Some otherBread", 1.5F) };

    public Form1()
    {
        InitializeComponent();
    }

    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        listBox1.Items.Clear();

        if (comboBox1.Items.IndexOf(comboBox1.SelectedItem) == 0)
        {
            foreach (Product item in Drinks)
            {
                listBox1.Items.Add(item.ProductName);
            }
        }
        else 
        {
            foreach (Product item in Bread)
            {
                listBox1.Items.Add(item.ProductName);
            }
        }
    }

    private void listBox1_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        // do something here
    }
}

public class Product
{
    private string productName;
    private float price;

    public Product(string productName, float price)
    {
        this.ProductName = productName;
        this.Price = price;
    }

    public string ProductName
    {
        get { return productName; }
        set { productName = value; }
    }

    public float Price
    {
       get { return price; }
       set { price = value; }
    }
}

Answer 1

我不确定你到底在寻找什么，但也许你可以在产品结构中加入产品类型（饮料或面包）？

public struct Products
{
    public string type;
    public string name;
    public double price;
}

然后您可以创建列表

List<Products>

并像在示例中那样在foreach循环中使用它

Answer 2

听起来你正在寻找的是：

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    listBox1.Items.Clear();

    // start with Bread and change if necessary.
    List<Product> products = Bread;

    if (comboBox1.Items.IndexOf(comboBox1.SelectedItem) == 0)
    {
        //change the value of "products"
        products = Drinks;
    }

    foreach (Product item in products)
    {
        listBox1.Items.Add(item.ProductName + item.Price);
    }

}

将名称列入变量c＃

2 个答案: