求助
下面是1个Button的click事件,当在textbox1里面输入非数字,点击按钮后,弹出对话框“请输入数字”,不太明白try catch为什么可以实现检查输入数据是否数字的功能
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Dim test As Integer
Try
test = TextBox1.Text
Catch ex As Exception
MsgBox("请输入数字")
Exit Sub
End Try
End Sub