vb.net e.keychar 不是 system.eventargs 的成员 - Visual Basic 2010
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e.keychar is not a member of system.eventargs - Visual Basic 2010
提问by Carlos Lee
I'm trying to block my text boxes in order that they can only accept numbers. I was looking in the Internet and I found this code
我试图阻止我的文本框，以便它们只能接受数字。我在网上找，我找到了这个代码
Private Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) HandlesTextBox1.TextChanged
If Not Char.IsNumber(e.KeyChar) And Not Char.IsControl(e.KeyChar) Then
e.Handled = True
End If
End Sub
The thing is that there is an error message displayed:
问题是显示了一条错误消息：
e.keychar is not a member of system.eventargs
e.keychar 不是 system.eventargs 的成员
I already imported the Imports System.EventArgs. Any idea how to fix this?
我已经导入了Imports System.EventArgs. 知道如何解决这个问题吗？
回答by ikudeljnj
I believe the problem lies in the event you're handling. It should probably not be TextChanged. e.KeyCharis usually in the EventArgsfor KeyPresshandlers. Try using something like TextBox1_KeyPress.
我相信问题在于您正在处理的事件。应该不是TextChanged。e.KeyChar通常在EventArgsforKeyPress处理程序中。尝试使用类似TextBox1_KeyPress.
回答by codingbiz
This should work:
这应该有效：
Public Class Form1
Private Sub TextBox1_KeyDown(sender As Object, e As KeyEventArgs)
If e.KeyValue < 48 OrElse e.KeyValue > 57 Then _
e.SuppressKeyPress = True
End Sub
End Class
回答by Taylor Fielder
It needs to have (sender As Object, e As KeyPressEventArgs) which e.KeyChar is a member of
它需要有 (sender As Object, e As KeyPressEventArgs) 其中 e.KeyChar 是
