Question

我是新手，所以越简单越好。我创建了一个类，其中包含项目的详细信息，例如项目名称，价格和描述。我创建了一个构造函数，以便在创建时初始化对象。

    //mediaPicker is your UIImagePickerController
func navigationController(navigationController: UINavigationController, willShowViewController viewController: UIViewController, animated: Bool) {
    if(mediaPicker.sourceType == UIImagePickerControllerSourceType.PhotoLibrary){
        let button = UIBarButtonItem(title: "Take picture", style: UIBarButtonItemStyle.Plain, target: self, action: "showCamera")
        viewController.navigationItem.rightBarButtonItem = button
    }else{
        let button = UIBarButtonItem(title: "Choose picture", style: UIBarButtonItemStyle.Plain, target: self, action: "choosePicture")
        viewController.navigationItem.rightBarButtonItem = button
        viewController.navigationController?.navigationBarHidden = false
        viewController.navigationController?.navigationBar.translucent = true
    }
}

func showCamera(){
    mediaPicker.sourceType = UIImagePickerControllerSourceType.Camera
}

func choosePicture(){
    mediaPicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
}

在主类中，我创建了一个class Item { string itemName; double price; string description; public Item(string itemName, double price, string description) { this.itemName = itemName; this.price = price; this.description = description; } }个对象和该类的两个对象。然后我在List中添加了两个对象。如何显示每个对象及其值？我试图使用foreach，但我无法弄清楚如何。

List

Answer 1

公共领域的类似内容：

foreach (Item s in items)
{
  Console.WriteLine("{0} {1} {2}", s.itemName, s.price, s.description);
}

或者您可以覆盖ToString（）方法：

class Item 
{
  /// your code

  public override string ToString()
  {
    return string.Format("{0} {1} {2}", itemName, price, description);
    // or in C# 6 in Visual Studio 2015:
    // return $"{itemName} {price} {description}";
  }

Answer 2

您可以为此目的覆盖ToString方法，如下所示：

public override string ToString()
{
     return string.Format("itemName = {0} , price = {1} , description = {2}", itemName, price, description);
}

甚至更好用字符串插值（c＃6）：

public override string ToString()
{
     return $"itemName = {itemName} , price = {price} , description = {description}";
}

Answer 3

只需覆盖ToString即可获得所需的字符串输出。

public override string ToString()
{
    return string.Format("{0}{1}{2}", itemName, price, description);
}

如何显示对象列表的内容？

3 个答案: