Question

我的生成器中有这个功能。

    Private Sub AddBoundedValue(ByVal boundedValue As Object, ByVal type As CodeTypeDeclaration, ByVal numericType As Type, name As String)

        If boundedValue IsNot Nothing Then

            Dim constant As New CodeMemberField(numericType, name)
            constant.Attributes = MemberAttributes.Const Or MemberAttributes.Public
            constant.InitExpression = New CodePrimitiveExpression(Convert.ChangeType(boundedValue, numericType))
            type.Members.Add(constant)

        End If

    End Sub

如果开发人员为“boundedValue”参数传递小数，为“numericType”参数传递小数，则会生成以下代码。

Public Const DollarAmountMaximumValue As Decimal = 100000

尽管传递给CodePrimitiveExpression对象的构造函数的数据类型是十进制，但生成的代码是一个整数，它被隐式转换并存储在十进制变量中。是否有任何方法可以使用“D”生成数字，如下所示：

Public Const DollarAmountMaximumValue As Decimal = 100000D

感谢。

Answer 1

嗯，我对这个解决方案并不满意，但除非有人有更好的解决方案，否则我将不得不接受它。

Private Sub AddBoundedValue(ByVal boundedValue As Object, ByVal type As CodeTypeDeclaration, ByVal numericType As Type, name As String)

    If boundedValue IsNot Nothing Then

        Dim constant As New CodeMemberField(numericType, name)
        constant.Attributes = MemberAttributes.Const Or MemberAttributes.Public
        If numericType Is GetType(Decimal) AndAlso [I detect if the language is VB.NET here] Then
            constant.InitExpression = New CodeSnippetExpression(boundedValue.ToString & "D")
        Else
            constant.InitExpression = New CodePrimitiveExpression(Convert.ChangeType(boundedValue, numericType))
        End If
        type.Members.Add(constant)

    End If

End Sub

如何使用CodeDom创建十进制常量？

1 个答案: