XmlSerializer - 添加为 Object 中 Null 属性的空元素

问：

序列化 to 时，当对象属性值为 null 时，不会添加该元素。如何在XML中添加该元素的空值？objectXMLSerializer

ggø

[XmlRoot(ElementName ="Employee")]
public class Employee
{
    [XmlElement(ElementName = "EmployeeId", IsNullable = false)]
    public int EmployeeId {get;set;}

    [XmlElement(ElementName = "EmployeeName", IsNullable = false)]
    public string EmployeeName {get;set;}
}

序列化程序类

public static class GenericXmlSerializer
{
    public static string SerializeObject<T>(this T toSerialize)
    {
        var xmlSerializer = new SystemXml.XmlSerializer(toSerialize.GetType());

        using (StringWriter textWriter = new StringWriter())
        {
            xmlSerializer.Serialize(textWriter, toSerialize);
            return textWriter.ToString();
        }
    }
}

解析

var emp = new Employee();
emp.SerializeObject();

实际输出：

<?xml version="1.0" encoding="utf-16"?>
<Entity xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" />

预期输出：

<?xml version="1.0" encoding="utf-16"?>
<Entity xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" />
<Employee>
   <EmployeeId></EmployeeId>
   <EmployeeName></EmployeeName>
</Employee>

有什么想法吗？

评论后编辑：

更改时，输出如下所示，这与预期不符。IsNullable=true

<?xml version="1.0" encoding="utf-16"?>
<Employee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <EmployeeId xsi:nil="true" />
</Employee>