类型中带有缩窄运算符的属性的XmlDeserialization

Question

我已经创建了以下自定义类来处理特定的字符串(“YYY”)作为动态当前值的表示形式。有几个ou扩展、缩小和ToString函数来帮助程序员进行代码转换.

我的问题是当我使用反序列化时，使用XmlSerializer，一个使用MyDateTime的类。我认为XmlSerializer会在使用反射之前使用Narrowing Operator CType(rightSide As String) As MyDateTime作为对象初始化器。

如果我希望MyDateTime的xml反序列化类属性使用Narrowing Operator CType(rightSide As String) As MyDateTime初始化，该怎么办?？

Public Class MyDateTime

Const cstUniversalTodayValue As String = "YYYY-MM-DD"

Dim _internalStringRepresentation As String
Dim _internaValue As MyDateTime

Public ReadOnly Property DynamicToday As Boolean
    Get
        Return _internalStringRepresentation = cstUniversalTodayValue
    End Get
End Property

Public Shared Widening Operator CType(rightSide As MyDateTime) As MyDateTime

    Return rightSide._internaValue
End Operator
Public Shared Widening Operator CType(rightSide As MyDateTime) As String

    Return rightSide._internalStringRepresentation
End Operator

Public Shared Narrowing Operator CType(rightSide As MyDateTime) As MyDateTime

    Return New MyDateTime With {._internalStringRepresentation = rightSide.ToString("yyyy-MM-dd"), ._internaValue = rightSide}
End Operator
Public Shared Narrowing Operator CType(rightSide As String) As MyDateTime

    Dim instance = New MyDateTime With {._internalStringRepresentation = rightSide}
    If instance.DynamicToday Then

        instance._internaValue = DateTime.Today
    Else

        instance._internaValue = Convert.ToDateTime(rightSide)
    End If

    Return instance
End Operator

Public Overrides Function ToString() As String
    Return Me
End Function
Public Overloads Function ToString(format As String) As String

    Return _internaValue.ToString(format)
End Function
End Class

Answer 1

XmlSerializer不使用类型转换。只需使用斯根工具为您的类型生成序列化程序集，并通过反射器浏览生成的代码以了解其工作原理。

XmlSerializer实例化执行其构造函数的类，并在以后填充其可序列化属性。

要确保正确序列化类的实例，请实现ISerializable接口。您还可以通过实现IXmlSerializable接口获得对XML序列化过程的更多控制。