使用 CompilerServices.Extensions 扩展密封的内在数据类型 - 无法重用？
我定义了以下日期扩展？这
'Nullable Date Extensions
<System.Runtime.CompilerServices.Extension()> _
Public Function ToObject(ByVal thisInstance As Date?) As Object
Return If(thisInstance.HasValue, CType(thisInstance, Object), DBNull.Value)
End Function
给了我执行此操作的简洁功能：
Public Property MyDateTime() As Date?
rowTest.Item("MyDate") = Me.MyDate.ToObject
但是，当我将编译器定义移动到单独的 DLL 时，即使我引用了现在包含扩展的 Class 项目，ToObject 方法也不再从我的项目中可用。
这是编译器扩展的限制吗？如何获得它们的可重用性？
I defined the following extension of the Date? data type
'Nullable Date Extensions
<System.Runtime.CompilerServices.Extension()> _
Public Function ToObject(ByVal thisInstance As Date?) As Object
Return If(thisInstance.HasValue, CType(thisInstance, Object), DBNull.Value)
End Function
Which gave me the terse capability to do this:
Public Property MyDateTime() As Date?
rowTest.Item("MyDate") = Me.MyDate.ToObject
But when I moved my compiler definition to a separate DLL, I the ToObject method was no longer available from my project even though I had referenced the Class project which now contained the extension.
Is this a limitation of the Compiler Extensions? HOw do you get reusability out of them?
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您需要在其他项目的目标文件中包含 .ToObject 命名空间（包含 Nullable 日期扩展的命名空间）。
You'll need to include the .ToObject namespace (the namespace containing your Nullable date extensions) in your target file in the other project.