验证文本框 [英] Validate a textbox

问题描述

我使用的是visual basic 2010，我有一个文本框，我需要验证它才能接受十进制数，我该如何添加代码?我有这个代码只用于整数

I'm using visual basic 2010 and I have a textbox and I need to validate it to also accept decimal number how can I add the code? I have this code just for integer

If Not ( (e.KeyValue >= 48 And e.KeyValue <= 57)  
         OrElse (e.KeyValue >= 96 And e.KeyValue <= 105)   
         OrElse (e.KeyValue = 8) ) Then   
    e.Handled = True  
    MsgBox("Este campo requiere únicamente valores númericos")
    AngulobuzamientoTextBox.Text = vbNullChar


End If

推荐答案

与其尝试在输入时一次一个验证 TextBox 中的字符，我建议等到用户完成输入并将焦点移至另一个控件.然后您可以处理 TextBox 的 Validating 事件并使用 Decimal.TryParse 来验证文本并将其转换为十进制值.如果验证失败，则显示错误消息并设置 e.Cancel = True 以防止焦点移出 TextBox.

Rather than try to validate the characters in the TextBox one at a time as they are typed, I suggest waiting until the user finishes typing and moves focus to another control. Then you can handle the TextBox's Validating event and use Decimal.TryParse to validate the text and convert it to a decimal value. If the validation fails, show an error message and set e.Cancel = True to prevent the focus moving out of the TextBox.

Private number As Decimal

Private Sub TextBox1_Validating(sender As Object, e As System.ComponentModel.CancelEventArgs) Handles TextBox1.Validating
    If Not Decimal.TryParse(TextBox1.Text, number) Then
        MessageBox.Show("Enter a valid Decimal Number")
        e.Cancel = True
    End If
End Sub

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