实例化数组时出现异常

Question

我有对象"根对象"；如我的代码所示。我有一个对象cars的列表"list_of_cars"，我正试图创建一个"；根对象"；它包含一个带有"0"的数组；汽车；列表因此，我正在实例化一个根对象，并尝试分配数组。问题是我总是收到错误"System.NullReferenceException：对象引用未设置为对象的实例">

public class Rootobject
{
public PricingData data { get; set; }
}
public class PricingData
{
public Cars[] cars { get; set; }
}
public class Cars
{
public string code { get; set; }
public string name { get; set; }
public decimal price { get; set; }
}
Rootobject myobject = new Rootobject();
myobject.data.cars = list_of_cars.ToArray();//here I am getting the error

Answer 1

您的Rootobject包含类型为PricingData的对象，该对象在创建Rootobject时未实例化

当您创建Rootobject时，请尝试以下解决方案之一来实例化您的属性

public class Rootobject
{
public PricingData data { get; set; } = new PricingData();
}
public class PricingData
{
public Cars[] cars { get; set; } = Array.Empty<Cars>();
}

public class Rootobject
{
public PricingData()
{
data = new PricingData();
}
public PricingData data { get; set; }
}
public class PricingData
{
public PricingData()
{
cars = Array.Empty<Cars>();
}
public Cars[] cars { get; set; } 
}