如何在 vb.net 中使用计时器
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How to use timer in vb.net
提问by Joa.know
I have this code:
我有这个代码：
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
Dim num As String
Dim message As String
Dim name As String
message = txtMessage.Text
Dim count As Integer = Me.TblContactsBindingSource.Count
If i < TblContactsDataGridView.Rows.Count - 1 Then 'stay within bounds
i = i + 1 ' for all rows except Row0
TblContactsDataGridView.Rows(i - 1).DefaultCellStyle.BackColor = Color.White ' restore previous highlight
TblContactsDataGridView.Rows(i).DefaultCellStyle.BackColor = Color.Bisque 'new highlight
num = Me.TblContactsDataGridView.Rows(i).Cells(1).Value.ToString()
name = Me.TblContactsDataGridView.Rows(i).Cells(0).Value.ToString()
If SerialPort1.IsOpen() Then
SerialPort1.Write("AT" & vbCrLf)
SerialPort1.Write("AT+CMGF=1" & vbCrLf)
SerialPort1.Write("AT+CMGS=" & Chr(34) & num & Chr(34) & vbCrLf)
SerialPort1.Write(message & Chr(26))
MessageBox.Show("Message has been successfully sent to " & vbNewLine & name & " (" & num & ") ", "Message Sent", MessageBoxButtons.OK, MessageBoxIcon.Information)
End If
Else 'next row is off the bottom so
'i = 0 'reset index
'TblSmsDataGridView.Rows(TblSmsDataGridView.Rows.Count - 1).DefaultCellStyle.BackColor = Color.White 'restore bottom row
'TblSmsDataGridView.Rows(i).DefaultCellStyle.BackColor = Color.Bisque 'highlight top row
End If
In a command button I have this:
在命令按钮中，我有这个：
Timer1.Interval = 2000
Timer1.Enabled = True 'no need to enable it and start it; one or t'other
What happen is, the message box appears over and over. How can i trigger message box to automatically close once it is finished? I commented the code in the "else" because the it repeats over and over.
发生的情况是，消息框一遍又一遍地出现。完成后如何触发消息框自动关闭？我在“else”中注释了代码，因为它一遍又一遍地重复。
回答by alan_dw
You have to use a custom message box. Normal message box wont do the thing you wanted. It will pop up every 2 second. best choice is to make a new form and show it as a message box. :)
您必须使用自定义消息框。普通的消息框不会做你想做的事情。它会每 2 秒弹出一次。最好的选择是制作一个新表单并将其显示为消息框。:)
回答by xpda
You need to set timer1.enabled = falsein the timer1.tick handler.
您需要timer1.enabled = false在 timer1.tick 处理程序中进行设置。
