如何忽略序列化可为空的属性，如果它是null或空？ [英] How to ignore a nullable property from serialization if it is null or empty?

问题描述

我有用于XML序列化的类。

在里面有我有饰有XmlAttribute可为空属​​性：

  [XmlAttribute（LASTUPDATED）]
 公众的DateTime？ LASTUPDATED {搞定;组; }
 

如何忽略序列化的属性，如果它是null或空？

我试过以下，但如果有一个值（始终忽略），它不序列化：

  [XmlIgnore]
        公众的DateTime？ LastUpdatedValue {搞定;组; }        [XmlAttribute（LASTUPDATED）]
       公众的DateTime LASTUPDATED {搞定;组; }        公共BOOL ShouldSerializeLastUpdated（）
        {
            返回LastUpdatedValue.HasValue;
        }
 

解决方案

可空不直接XmlSerialization支持。

如果你想使用一个可空属性，你必须使用非可空属性，并使用与后缀属性相同的名字添加一个布尔属性指定，这specifie当属性必须是可序列化。

与你的情况的一个例子：

 私人的DateTime？ _最近更新时间;    [XmlAttribute（LASTUPDATED）]
    公众的DateTime LASTUPDATED {
        获得{
            返回（DATETIME）_LastUpdated;
        }
        组
        {
            _LastUpdated =价值;
        }
    }    公共BOOL LastUpdatedSpecified
    {
        得到
        {
            返回_lastUpdated.HasValue;
        }
    }
 

I have a class which is used for Xml Serialization.

Inside which I have a nullable property which is decorated with XmlAttribute:

 [XmlAttribute("lastUpdated")]
 public DateTime? LastUpdated { get; set; }

How to ignore the property from serialization if it is null or empty?

I've tried the below but it doesn't serialize when there is a value (always ignores):

  [XmlIgnore]
        public DateTime? LastUpdatedValue { get; set; }

        [XmlAttribute("lastUpdated")]
       public DateTime LastUpdated { get; set; }

        public bool ShouldSerializeLastUpdated()
        {
            return LastUpdatedValue.HasValue;
        }

解决方案

Nullable is not directly supported by XmlSerialization.

If you want use a nullable property you must use a non nullable property and add a boolean property with the same name of property with the suffix "Specified" which specifie when the property must be serializable.

An example with your case :

    private DateTime? _lastUpdated;

    [XmlAttribute("lastUpdated")]
    public DateTime LastUpdated {
        get {
            return (DateTime)_lastUpdated;
        }
        set
        {
            _lastUpdated = value;
        }
    }

    public bool LastUpdatedSpecified
    {
        get
        {
            return _lastUpdated.HasValue;
        }
    }

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