Question

嗨，我在学习c＃时遇到了麻烦，因为在Java中我习惯用Java来做这个。

public class Product 
{
   private double price;

   public double getPrice() {
    return price;
   }

   public void setPrice(double price) {
    this.price = price;
   }
}
public class Item 
{
  private int quantity;
  private Product product;

  public double totalAmount()
  {
    return product.getPrice() * quantity;
  }
}

totalAmount（）方法是Java的一个示例，用于访问另一个类中对象的值。如何在c＃中实现相同的功能，这是我的代码

public class Product
{
  private double price;

  public double Price { get => price; set => price = value; }
}

public class Item 
{
  private int quantity;
  private Product product; 

  public double totalAmount()
  {
    //How to use a get here
  }   
}

我不知道我的问题是否清楚，但基本上我想知道的是，如果我的对象是一个类的实际值，我该如何实现get或set？

Answer 1

首先，不要为此使用表达式身体属性...只需使用自动属性：

public class Product
{
  public double Price { get; set; }
}

最后，您没有明确访问getter，只是获得Price的值：

public double totalAmount()
{
    // Properties are syntactic sugar. 
    // Actually there's a product.get_Price and 
    // product.set_Price behind the scenes ;)
    var price = product.Price;
}

Answer 2

在C＃中你有属性： https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/using-properties

自动实施的属性： https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/auto-implemented-properties

你可以使用两者来实现：

    public class Product
    {
        public decimal Price { get; set; }
    }

    public class Item
    {
        public Product Product { get; set; }

        public int Quantity { get; set; }

        public decimal TotalAmouint
        {
            get
            {
                //Maybe you want validate that the product is not null here.
                return Product.Price * Quantity;
            }
        }
    }

从另一个类c＃

2 个答案: