C＃XML对象，插入值

Question

我遇到了XML对象创建的问题。我不能影响我的对象的任何值，这里有一些细节：

首先，我在C＃中创建了以下XML映射：

[XmlRoot(ElementName = "pertinentLocation")]
public class PertinentLocation
{
    [XmlElement(ElementName = "predefinedLocationReference")]
    public string PredefinedLocationReference { get; set; }
    [XmlAttribute(AttributeName = "type")]
    public string Type { get; set; }
}

[XmlRoot(ElementName = "travelTime")]
public class TravelTime
{
    [XmlElement(ElementName = "duration")]
    public string Duration { get; set; }
}

[XmlRoot(ElementName = "freeFlowTravelTime")]
public class FreeFlowTravelTime
{
    [XmlElement(ElementName = "duration")]
    public string Duration { get; set; }
}

[XmlRoot(ElementName = "freeFlowSpeed")]
public class FreeFlowSpeed
{
    [XmlElement(ElementName = "speed")]
    public string Speed { get; set; }
}

[XmlRoot(ElementName = "travelTimeDataExtended")]
public class TravelTimeDataExtended
{
    [XmlElement(ElementName = "reliability")]
    public string Reliability { get; set; }
}

[XmlRoot(ElementName = "travelTimeDataExtension")]
public class TravelTimeDataExtension
{
    [XmlElement(ElementName = "travelTimeDataExtended")]
    public TravelTimeDataExtended TravelTimeDataExtended { get; set; }
}

[XmlRoot(ElementName = "basicData")]
public class BasicData
{
    [XmlElement(ElementName = "measurementOrCalculatedTimePrecision")]
    public string MeasurementOrCalculatedTimePrecision { get; set; }
    [XmlElement(ElementName = "measurementOrCalculationPeriod")]
    public string MeasurementOrCalculationPeriod { get; set; }
    [XmlElement(ElementName = "measurementOrCalculationTime")]
    public string MeasurementOrCalculationTime { get; set; }
    [XmlElement(ElementName = "pertinentLocation")]
    public PertinentLocation PertinentLocation { get; set; }
    [XmlElement(ElementName = "travelTimeTrendType")]
    public string TravelTimeTrendType { get; set; }
    [XmlElement(ElementName = "travelTime")]
    public TravelTime TravelTime { get; set; }
    [XmlElement(ElementName = "freeFlowTravelTime")]
    public FreeFlowTravelTime FreeFlowTravelTime { get; set; }
    [XmlElement(ElementName = "freeFlowSpeed")]
    public FreeFlowSpeed FreeFlowSpeed { get; set; }
    [XmlElement(ElementName = "travelTimeDataExtension")]
    public TravelTimeDataExtension TravelTimeDataExtension { get; set; }
    [XmlAttribute(AttributeName = "type")]
    public string Type { get; set; }
}

[XmlRoot(ElementName = "elaboratedData")]
public class ElaboratedData
{
    [XmlElement(ElementName = "basicData")]
    public BasicData BasicData { get; set; }
    [XmlAttribute(AttributeName = "id")]
    public string Id { get; set; }
}

然后我发起了它：

ElaboratedData objXml = new ElaboratedData(); 

但问题在于：

objXml.BasicData.Type = "TravelTime";

当我试图影响obj.Xml中的某个值时，它会说：

ElaboratedData.BasicData.get返回null。

我今天在C＃中发现了XML，我现在有点丢失了