UI 在使用串口通信时很慢

Question

美好的一天！我想从串口读取数据。数据可以每 2 秒读取一次并将其保存到数据库中，幸运的是做到了。我用了一个datagridview来显示和保存它。但它似乎很滞后。我必须等待几秒钟才能单击另一个按钮。还有其他方法可以做到这一点吗？任何帮助都可以。谢谢！

Imports System.Data.OleDb
Public Class PICtoVB[enter image description here][1]
Dim connString As String = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=C:\Users\Recto D Sanchez Jr\Desktop\Datalogger GUI\test\test\bin\Debug\database1.accdb"
Dim MyConn As OleDbConnection
Dim da As OleDbDataAdapter
Dim ds As DataSet
Dim tables As DataTableCollection
Dim source1 As New BindingSource
Dim timerval As Integer = 0

Private Sub btnconnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnconnect.Click
    btnconnect.Enabled = False
    btnread.Enabled = True
    btndisconnect.Enabled = True
    SerialPort1.Open()
    Timer1.Enabled = True
End Sub

Private Sub btndisconnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btndisconnect.Click
    btndisconnect.Enabled = False
    btnread.Enabled = False
    btnconnect.Enabled = True
    Timer1.Enabled = False
    SerialPort1.Close()
End Sub


Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
    timerval = timerval + 1

    Dim serialdata1 As String
    Dim serialdata2 As String
    Dim serialdata3 As String
    Dim serialdata4 As String

    Try
        serialdata1 = SerialPort1.ReadLine.ToString
        serialdata2 = SerialPort1.ReadLine.ToString
        serialdata3 = SerialPort1.ReadLine.ToString
        serialdata4 = SerialPort1.ReadLine.ToString
        dgvdata.Rows.Add(serialdata1, serialdata2, serialdata3, serialdata4)
        DATALOGBindingSource1.AddNew()
        DATETextBox.Text = serialdata1
        TIMETextBox.Text = serialdata2
        TEMP__C_TextBox.Text = serialdata3
        RH____TextBox.Text = serialdata4
        DATALOGBindingSource1.EndEdit()
        DATALOGTableAdapter1.Update(Database1DataSet1.DATALOG)

    Catch ex As Exception

    End Try
End Sub

Answer 1

您正在 UI 线程上从 SerialPort 读取数据，这意味着它太忙无法维护 UI，因此 UI 冻结期间。一般来说，您处理 SerialPort 的 DataReceived 事件并在那里读取数据。该事件处理程序在辅助线程上执行，这意味着您可以在不影响 UI 的情况下随意读取和操作数据。但是，您不能从那里更新 UI，因此一旦处理完数据并准备好显示它，您需要编组对 UI 线程的方法调用并在那里进行更新。这是一个您可以找到很多示例的主题。

UI 在使用串口通信时很慢

UI is laggy when using serial communication

vb.net

serial-port

datagridview