Question

我有以下课程：

public class QualifyResponse
{       
    List<ProviderQualifyResponse> _providerList = new List<ProviderQualifyResponse>();

    public List<ProviderQualifyResponse> ProviderList
    {
        get { return _providerList; }
        set { _providerList = value; }
    }
}

public class ProviderQualifyResponse
{
    private string _providerCode = string.Empty;

    public string ProviderCode
    {
        get { return _providerCode; }
        set { _providerCode = value; }
    }

    private List<QuestionGroup> _questionGroupList = new List<QuestionGroup>();

    public List<QuestionGroup> QuestionGroupList
    {
        get { return _questionGroupList; }
        set { _questionGroupList = value; }
    }
}

我有QualifyResponse对象，其中填充了ProviderQualifyResponse，但QuestionGroupList为空。现在我要填写QuestionGroupList。当我尝试这样做时：

QualifyResponse qualifyResponse = response;
qualifyResponse.ProviderList.QuestionGroupList = new List<DataTypes.BuyFlow.Entities.QuestionGroup>();

我收到错误：

System.Collections.Generic.List＆＃39;才不是包含＆＃39; QuestionGroupList＆＃39;的定义没有扩展方法＆＃39; QuestionGroupList＆＃39;接受第一个类型的参数＆＃39; System.Collections.Generic.List＆＃39;可能发现（您是否缺少using指令或程序集引用？）

如何向List<QuestionGroup>添加qualifyResponse.ProviderList？

Answer 1

错误就是这个表达式：

qualifyResponse.ProviderList.QuestionGroupList

ProviderList的类型为List。您必须更改它才能填充正确的项目。像这样：

int index = ...;
qualifyResponse.ProviderList[index].QuestionGroupList = ...

Answer 2

问题是QuestionGroupList是类ProviderQualifyResponse的属性，如果要添加List，则需要将其分配给object的属性。示例如何为所有提供者执行此操作：

QualifyResponse qualifyResponse = response;
foreach(var provider in qualifyResponse.ProviderList)
{
     provider.QuestionGroupList = new List<DataTypes.BuyFlow.Entities.QuestionGroup>();
}

Answer 3

鉴于<span id="table1"> </span> <table border="1"> <tbody><tr> <td>TD #0</td> <td>TD #1</td> <td>TD #2</td> </tr> <tr> <td>TD #3</td> <td>TD #4</td> <td>TD #5</td> </tr> <tr> <td>TD #6</td> <td>TD #7</td> <td>TD #8</td> </tr> </tbody></table>属于qualifyResponse.ProviderList类型，您正在尝试访问List<ProviderQualifyResponse>，这不会作为错误状态存在。

您需要遍历列表中的实例以访问实例属性（如果这是您的意图），或者从您希望实例化的列表中选择一个实例。

List.QuestionGroupList

如何在c＃中将对象添加到列表项

3 个答案: