c# - 将字段标记为具有属性 [XmlElement] 的 IsRequired

Question

我有一个要序列化的类

[System.Xml.Serialization.XmlTypeAttribute(Namespace = "http://xyz.com/schema")]
public class Customer
{
    [System.Xml.Serialization.XmlElementAttribute(Order = 0)]
    public int Id { get; set; }

    [System.Xml.Serialization.XmlElementAttribute(Order = 1)]
    public string Name { get; set; }

    [System.Xml.Serialization.XmlElementAttribute(Order = 2)]
    public string Url{ get; set; }

    [System.Xml.Serialization.XmlElementAttribute(Order = 3)]
    public string Count { get; set; }
}

反序列化时，如果 Url 为空，则输出 XML 不包含 Url 节点。如何将其标记为必填字段以便每次都创建 Url 节点？

Answer 1

IsNullable 属性应该可以做到这一点。

 [System.Xml.Serialization.XmlElementAttribute(Order = 2,IsNullable=true)]

如果它设置为 true，它应该生成标签(根据 MSDN)。

If the IsNullable property is set to true, the xsi:nil attribute is generated for class members that have been set to a null reference (Nothing in Visual Basic). For example if you set a field named MyStringArray to a null reference (Nothing in Visual Basic), the XmlSerializer generates the following XML code.

<MyStringArray xsi:nil = "true" />