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Question

Good afternoon. I have a strange problem. When iterating through the list, SortedDictionary does not recognize the key. Namely, it gives out that the key was not found. System.Collections.Generic.KeyNotFoundException

此外，仅当向列表添加超过 2 个元素时才会发出错误。同时，如果1号有3个错误，如果1号有5个错误，那么1号和3号又会有4个。

public: Collections::Generic::SortedDictionary<Product_for_sale^, int> products;
 
void Score:: setProductsLabel() {
    int y = 50;
    productLabels.Clear();
    for each (Product_for_sale ^ key in products.Keys) {
        
        String^ product_by_score = "";
        System::Windows::Forms::Label^ info = (gcnew System::Windows::Forms::Label());
        
            if (products[key] > 0) {
                product_by_score = key->getName() + "       |       " + products[key] +
                    "        |        " + key->getFullPrice() * products[key] + "\n";
                info->BackColor = System::Drawing::Color::Red;
            }
            else {
                info->BackColor = System::Drawing::Color::PaleGreen;
                product_by_score = key->getName() + "       |       " + "СОБРАНО" +
                    "        |        " + key->getFullPrice() * products[key] + "\n";
            }
        
        
        
        info->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 10.00F, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point,
            static_cast<System::Byte>(204)));
        info->AutoSize = true;
        info->Location = System::Drawing::Point(10, y);
        info->Name = L"label4";
        info->Size = System::Drawing::Size(100, 25);
        info->TabIndex = 2;
        info->Text = product_by_score;
        productLabels.Add(key,info );
 
        y += 30;
    }
    
    
 
}
 
//реализация сравнения в классе Product_for_sale
 
int Product_for_sale::equals(Product_for_sale^ pfs) {
    if (this->name->Equals(pfs->getName())) {
        return 0;
    }
    else return 1;
}
int  Product_for_sale::CompareTo(Object^ obj){
 
    if (obj->GetType() == Product_for_sale::typeid) {
        Product_for_sale^ product = dynamic_cast<Product_for_sale^>(obj);
 
        return equals(product);
    }
    else return 1;
//  throw gcnew ArgumentException("object is not a Score");
}

错误恰好在表达式 products[key] 上与密钥本身崩溃，您可以工作并从对象获取数据。

我检查了入口处的占用列表，一切都正确，无论是键还是值。再说一次，如果列表中有 2 对，则一切正常。

Answer 1

这个决定是正确的，谢谢

`int  Product_for_sale::CompareTo(Object^ obj){

if (obj->GetType() == Product_for_sale::typeid) {
    Product_for_sale^ product = dynamic_cast<Product_for_sale^>(obj);
    
    return name->CompareTo(product->getName());
    
}
else return 1;

}`