如何将列表填充为类对象？

Question

如何将列表作为类对象填充？例如，这不起作用：

[DataContract]
public class JsonReviewFormFields
{
    [DataMember]
    public PersonalDevelopmentPlan personalDevelopmentPlan { get; set; }      
}

public class PersonalDevelopmentPlan
{
    public List<ShortTerm> shortTerm { get; set; }
    public List<LongTerm> longTerm { get; set; }
}

public class ShortTerm
{
    public string workRelated { get; set; }
    public string structured { get; set; }
    public string informal   { get; set; }       
    public string reviewDate { get; set; }
}

public class LongTerm
{
    public string workRelated { get; set; }
    public string structured { get; set; }
    public string informal { get; set; }
    public string reviewDate { get; set; }   
}

这是控制器的操作：

public JsonReviewFormFields GetReviewForm()
{
    PersonalDevelopmentPlan personalDevelopmentPlan = new PersonalDevelopmentPlan();

     List<ShortTerm> _itemsShort = new List<ShortTerm>();
    _itemsShort.Add(new ShortTerm { workRelated = "workRelated text", structured = "structured text", informal = "informal text", reviewDate = "reviewDate" });
    jsonReviewFormFields.personalDevelopmentPlan.shortTerm =  _itemsShort;

    List<LongTerm> _itemsLong = new List<LongTerm>();
    _itemsLong.Add(new LongTerm { workRelated = "workRelated text", structured = "structured text", informal = "informal text", reviewDate = "reviewDate" });
    jsonReviewFormFields.personalDevelopmentPlan.longTerm =  _itemsLong;     

    return jsonReviewFormFields;
}

代码崩溃在

jsonReviewFormFields.personalDevelopmentPlan.shortTerm =  _itemsShort;

这可能是一个基本的面向对象的错误。你是如何填充列表的？

Answer 1

您没有实例化它，您必须先实例化类型：

jsonReviewFormFields.personalDevelopmentPlan = new PersonalDevelopmentPlan();

然后设置它的属性：

jsonReviewFormFields.personalDevelopmentPlan.shortTerm =  _itemsShort

在此之前，您还必须实例化main类，我在控制器操作中没有看到这一点：

JsonReviewFormFields jsonReviewFormFields = new JsonReviewFormFields();