将可选枚举传递给 VB.NET 中的函数
Passing an optional Enum to a function in VB.NET
我正在尝试将可选的枚举传递给函数,但语法不正确。我正在尝试以下操作:
Public Function MyFunction(ByVal TestCode As String, Optional ByVal Columns As [Enum] = MyEnumName.EnumVariable) As Boolean
也尝试过:
Public Function MyFunction(ByVal TestCode As String, Optional ByVal Columns As [Enum] = MyEnumName) As Boolean
并得到错误信息
"Conversion from "MyEnumName" 到 "System.Enum" 不能出现在常量表达式中
是否可以有可选的枚举或者我做错了什么?
提前致谢
在处理 Enum
时,您必须将给定名称指定为类型,而不是 [Enum]
。示例代码:
Public Enum MyEnumName
val1
val2
End Enum
Public Function MyFunction(ByVal TestCode As String, Optional ByVal Columns As MyEnumName = MyEnumName.val1) As Boolean
End Function
我正在尝试将可选的枚举传递给函数,但语法不正确。我正在尝试以下操作:
Public Function MyFunction(ByVal TestCode As String, Optional ByVal Columns As [Enum] = MyEnumName.EnumVariable) As Boolean
也尝试过:
Public Function MyFunction(ByVal TestCode As String, Optional ByVal Columns As [Enum] = MyEnumName) As Boolean
并得到错误信息
"Conversion from "MyEnumName" 到 "System.Enum" 不能出现在常量表达式中
是否可以有可选的枚举或者我做错了什么?
提前致谢
在处理 Enum
时,您必须将给定名称指定为类型,而不是 [Enum]
。示例代码:
Public Enum MyEnumName
val1
val2
End Enum
Public Function MyFunction(ByVal TestCode As String, Optional ByVal Columns As MyEnumName = MyEnumName.val1) As Boolean
End Function