c# - Double 的蒙面文本框？

Question

我有一个蒙版文本框，我希望它能够接受 double 值。小数点前后可以容纳的字符数量不应该有种类限制。

我知道还有其他方法可以做到这一点，例如覆盖按键输入事件或使用数字上下，但我只是想问一下是否可以使用掩码。

我试过 9999999999.99999999 - 但它给了我很多问题 - 例如:

1 2 3 4 。 6个被接受为输入(包括空格)并且我无法删除 .无论我想要什么。

Answer 1

这是一个简单的解决方案。不需要面具。通常掩码并不是所有应用的答案。我写了最初的解决方案。如果需要，可以将它与面膜结合使用。

Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    AddHandlerTextBoxDouble(TextBox1)
End Sub

Public Sub AddHandlerTextBoxDouble(ByVal TextBoxMe As Object)
    Dim TextBox As New TextBox
    TextBox = CType(TextBoxMe, TextBox)
    AddHandler TextBox.KeyPress, AddressOf TextBox_KeyPress
    AddHandler TextBox.TextChanged, AddressOf TextBox_TextChanged
End Sub

Private Sub TextBox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs)
    ValidatingNumber(e, sender)
End Sub

Public Sub TextBox_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim TextBox As New TextBox
    TextBox = CType(sender, TextBox)
    If Not IsNumeric(TextBox.Text) And TextBox.Text <> "." Then
        TextBox.Text = ""
    End If
End Sub

Public Sub ValidatingNumber(ByVal e As Object, ByVal control As Object)
    Try
        If CType(control, TextBox).Text.IndexOf(".") > -1 And e.KeyChar = "." Then
            e.KeyChar = ""
        End If
        If (Asc(e.KeyChar) < 58 And Asc(e.KeyChar) > 47) Or e.KeyChar = vbBack Or e.KeyChar = "." Then
            e.KeyChar = e.KeyChar
        Else
            e.KeyChar = ""
            Try
                CType(e, System.Windows.Forms.KeyPressEventArgs).Handled = True
            Catch ex As Exception
            End Try
        End If
    Catch ex As Exception
        MsgBox("ValidatingNumber")
    End Try

End Sub


End Class