继承对象中的空引用问题
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我正在尝试编写简单的成员资格类代码。第一类的名称是Customer，它具有从Customer类继承的其他类，例如Silver_Customer，Gold_Customer。
我在简单的Windows应用程序中使用这些类：
public Customer customer;
public Form_MURAT_TURAN()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
Product p1 = new Product(\"Blouse\", 152.80);
Product p2 = new Product(\"T-Shirt\", 50.25);
.....
lbProducts.Items.Add(p1);
lbProducts.Items.Add(p2);
.....
}
private void btnCustomer_Click(object sender, EventArgs e)
{
Customer customer = new Standard_Customer(txtName.Text, txtSurname.Text, 0);
customer.Name = \"Mark 1\";
customer.TotalAmount = 5;
gbCustomer.Enabled = false;
gbProduct.Enabled = true;
set_info(customer.customerType(), customer.Name + \" \" + customer.Surname, customer.TotalAmount);
}
private void btnAddToBasket_Click(object sender, EventArgs e)
{
customer.Name = \"Mark 2\";
}
没有找到相关结果
已邀请:
2 个回复
秃拳割
中，您未设置全局对象。您正在设置它的本地版本。更改您的代码，如下所示：private void btnCustomer_Click(object sender, EventArgs e) { customer = new Standard_Customer(txtName.Text, txtSurname.Text, 0);号拳藐孔妇
private void btnCustomer_Click(object sender, EventArgs e) { this.customer = new Standard_Customer(txtName.Text, txtSurname.Text, 0); customer.Name = \"Mark 1\"; customer.TotalAmount = 5; gbCustomer.Enabled = false; gbProduct.Enabled = true; set_info(customer.customerType(), customer.Name + \" \" + customer.Surname, customer.TotalAmount); }。