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一个vb.net程序

Public Class Form1 Public Const PI As Single = 3.1415926 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim r As Integer Dim s As Double r = Val(TextBox.Text) s = PI * r * r TextBox.Text = s.ToString End Sub End Class 编译器发现如下错误.请高手帮忙看看,错误 1 重载决策失败,原因是没有可访问的“Val”可以用这些参数调用: 'Public Function Val(Expression As Object) As Double': 对非共享成员的引用要求对象引用。 'Public Function Val(Expression As Char) As Integer': 对非共享成员的引用要求对象引用。 'Public Function Val(InputStr As String) As Double': 对非共享成员的引用要求对象引用。 D:\My Documents\Visual Studio 2005\Projects\WindowsApplication12\WindowsApplication12\Form1.vb 10 13 WindowsApplication12
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