對象引用未設置爲響應對象的實例錯誤

Question

我在SoapUI上遇到Object reference not set to an instance of an object.錯誤。我使用記錄器來檢查record是否保留正確的StartTime和EndTime，但由於某種原因，當我嘗試將record對象（其中包含userId和TimePeriod）添加到響應中時，出現此錯誤。此外，result是具有從DataAccess圖層返回的信息的變量。任何幫助，將不勝感激。

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 

下面是代碼到我的反應：

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

您需要申報清單UserRecordList的新實例，因爲這將是null當您試圖插入的元素。

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

另外，您可以在類級別或在構造函數中添加此。

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

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