C# 实现简单的工厂模式

// 产品接口
public interface IProduct
{
    void ShowInfo();
}
// 具体产品A
public class ProductA : IProduct
{
    public void ShowInfo() => Console.WriteLine("这是产品A");
}
// 具体产品B
public class ProductB : IProduct
{
    public void ShowInfo() => Console.WriteLine("这是产品B");
}
// 工厂类
public class ProductFactory
{
    public static IProduct CreateProduct(string type)
    {
        return type switch
        {
            "A" => new ProductA(),
            "B" => new ProductB(),
            _ => throw new ArgumentException("无效的产品类型")
        };
    }
}
// 调用示例
public static void TestFactory()
{
    IProduct product = ProductFactory.CreateProduct("A");
    product.ShowInfo();
}