如何在xml和c中处理null＃

Question

假设我试图将xml反序列化到我的类，如果任何值为空或为十进制或日期时间为空，那么如何处理null。

[XmlElement(ElementName = "Salary" , typeof(double))] 
public string Salary { get; set; } 

[XmlElement(ElementName = "BirthDate" , typeof(DateTime))] 
public string Phone { get; set; } 

假设如果BirthDate或Salary在xml中为null或为空，那么在反序列化时如何处理它。需要解决。谢谢。

Answer 1

你有如下规定在XmlSerializer Class

指定System.ComponentModel.DefaultValueAttribute指定默认值

[System.ComponentModel.DefaultValueAttribute ("0")] 
[XmlElement(ElementName = "Salary" , typeof(double))] 
public string Salary { get; set; } 

[System.ComponentModel.DefaultValueAttribute ("02-May-2011")] 
[XmlElement(ElementName = "BirthDate" , typeof(datetime))] 
public string Phone { get; set; } 

Another option is to use a special pattern to create a Boolean field recognized by the XmlSerializer, and to apply the XmlIgnoreAttribute to the field. The pattern is created in the form of propertyNameSpecified. For example, if there is a field named "MyFirstName" you would also create a field named "MyFirstNameSpecified" that instructs the XmlSerializer whether or not to generate the XML element named "MyFirstName".

Answer 2

将“double”替换为可为空的类型“double？”。应该这样做。然后简单地处理你的对象缺乏价值。

或者你可以实现一个垫片属性：

XML Deserialization of a date with an empty value

Answer 3

。利用Nullabe类型会很容易解决的问题。

Answer 4

您可以使用Microsoft企业库验证应用程序块。或者简单地将类型改为Nullable。