Question

要在vb.net中编写扩展方法，必须将它们放在Module中，模块中定义的所有方法都会添加到全局命名空间中。

有没有办法从全局命名空间中删除这些方法，因此它们只用作扩展方法，或者实际上是否先写入模块名称？

示例

TypeExtensionMethods.vb：

Imports System.Runtime.CompilerServices

Public Module TypeExtensionMethods
    Private ReadOnly numericTypes As TypeCode() = {
        TypeCode.Byte, TypeCode.SByte, TypeCode.UInt16,
        TypeCode.UInt32, TypeCode.UInt64, TypeCode.Int16,
        TypeCode.Int32, TypeCode.Int64, TypeCode.Decimal,
        TypeCode.Double, TypeCode.Single}

    <Extension()>
    Public Function IsNumber(type As Type) As Boolean
        Dim currentTypeCode As TypeCode = Type.GetTypeCode(type)
        Return currentTypeCode.IsNumber()
    End Function

    <Extension()>
    Public Function IsNumber(type As TypeCode) As Boolean
        Return numericTypes.Any(Function(tc) tc = type)
    End Function
End Module

Class1.vb：

Class Class1

    Sub Main(value as Object)
        'This should work
        dim result1 as Boolean = value.GetType().IsNumber()
        'This should work
        dim result2 as Boolean = TypeExtensionMethods.IsNumber(value.GetType())
        'This should not work, the method IsNumber is polluting as it can be called without specifying where its defined.
        dim result3 as Boolean = IsNumber(value.GetType())
    End Sub
End Class

Answer 1

似乎这是不可能的！

VB.Net制作扩展方法而不污染全局命名空间？

1 个答案: