对象引用未设置为响应时对象错误的实例

Question

我在 SoapUI 上收到 Object reference not set to an instance of an object. 错误。我使用记录器检查record 是否拥有正确的StartTime 和EndTime 但由于某种原因，当我尝试将包含userId 和TimePeriod 的record 对象添加到响应中时，我得到了该错误。此外，result 是具有从DataAccess 层返回的信息的变量。对此的任何帮助将不胜感激。

GetUserResponse response = new GetUserResponse();
UserRecord record = new UserRecord();
record.UserId = userId;
record.timePeriodList = new List<TimePeriod>();
for (int i = 0; i < result.Count; i += 2)
{
    TimePeriod timeData = new TimePeriod();
    timeData.StartTime = result[i].Time;
    timeData.EndTime = result[i + 1].Time;
    record.timePeriodList.Add(timeData);
}
response.UserRecordList.Add(record); // line I get that error

这是我回复的代码：

public class GetUserResponse
{
    private List<UserRecord> userRecordList;

    public List<UserRecord> UserRecordList
    {
        get { return userRecordList; }
        set { userRecordList = value; }
    }
}

public class UserRecord
{
    private string userId;
    private List<TimePeriod> timePeriodList;

    public string UserId
    {
        get { return userId; }
        set { userId = value; }
    }

    public List<RbeActivationPeriod> TimePeriodList
    {
        get { return timePeriodList; }
        set { timePeriodList = value; }
    }
}

public class TimePeriod
{
    private DateTime startTime;
    private DateTime endTime;

    public DateTime StartTime
    {
        get { return startTime; }
        set { startTime = value; }
    }

    public DateTime EndTime
    {
        get { return endTime; }
        set { endTime = value; }
    }
}

Answer 1

您需要声明列表UserRecordList 的新实例，因为当您尝试插入元素时它将是null。

GetUserResponse response = new GetUserResponse();
response.UserRecordList = new List<UserRecord>();

或者，您可以在类级别或构造函数中添加它。

public class GetUserResponse
{
    private List<UserRecord> userRecordList = new List<UserRecord>();

    public List<UserRecord> UserRecordList
    {
        get { return userRecordList; }
        set { userRecordList = value; }
    }
}