vb.net - 自动实现的属性会导致空引用，而完整的写入属性不会

Question

谁能告诉我为什么要执行这个

Module Module1
    Sub Main()
        Dim currentSourceData As New SourceData
        currentSourceData.datafiles.Add("234")
    End Sub
End Module

给我

System.NullReferenceException：“对象引用未设置为对象的实例。”

当我使用自动实现的属性时

Public Class SourceData
    Public Property datafiles() As List(Of String)
End Class

---

但是当我使用完全编写的属性时它不会：

Public Class SourceData
    Private _datafiles As New List(Of String)
    Public Property datafiles() As List(Of String)
        Get 
           Return _datafiles
        End Get
        Set(value As List(Of String))
            _datafiles = value
        End Set
    End Property
End Class

标签： vb.netpropertiesnullreferenceexception

Answer 1

New此处缺少操作员：

Public Class SourceData
    Public Property datafiles() As List(Of String)
End Class