。载有（）自定义类对象名单 [英] .Contains() on a list of custom class objects

问题描述

我试图使用。载有（）功能自定义对象的名单上。

I'm trying to use the .Contains() function on a list of custom objects

这清单如下：

List<CartProduct> CartProducts = new List<CartProduct>();

以及 CartProduct ：

public class CartProduct
{
    public Int32 ID;
    public String Name;
    public Int32 Number;
    public Decimal CurrentPrice;
    /// <summary>
    /// 
    /// </summary>
    /// <param name="ID">The ID of the product</param>
    /// <param name="Name">The name of the product</param>
    /// <param name="Number">The total number of that product</param>
    /// <param name="CurrentPrice">The currentprice for the product (1 piece)</param>
    public CartProduct(Int32 ID, String Name, Int32 Number, Decimal CurrentPrice)
    {
        this.ID = ID;
        this.Name = Name;
        this.Number = Number;
        this.CurrentPrice = CurrentPrice;
    }
    public String ToString()
    {
        return Name;
    }
}

所以，我试图找到列表中的类似cartproduct

So i try to find a similar cartproduct within the list:

if (CartProducts.Contains(p))

但它忽略类似cartproducts，似乎我不知道它会检查 - 的ID？还是这一切？

But it ignores similar cartproducts and i don't seem to know what it checks on - the ID? or it all?

在此先感谢！ ：）

推荐答案

您需要执行 IEquatable 或覆盖等于（）和的GetHashCode（）

例如：

public class CartProduct : IEquatable<CartProduct>
{
    public Int32 ID;
    public String Name;
    public Int32 Number;
    public Decimal CurrentPrice;

    public CartProduct(Int32 ID, String Name, Int32 Number, Decimal CurrentPrice)
    {
        this.ID = ID;
        this.Name = Name;
        this.Number = Number;
        this.CurrentPrice = CurrentPrice;
    }

    public String ToString()
    {
        return Name;
    }

    public bool Equals( CartProduct other )
    {
        // Would still want to check for null etc. first.
        return this.ID == other.ID && 
               this.Name == other.Name && 
               this.Number == other.Number && 
               this.CurrentPrice == other.CurrentPrice;
    }
}

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