关于form的invoke的问题

Question

调用invok函数,有个很奇怪的问题:

var data = BuildDefaultCmdStruct();
var au = new AutoResetEvent(false);

data.data = ModbusFunction.BuildCmd03(txtID.ToByte(1), 4200, 12);

bool ia = false;
byte[] ba = null;

data.AfterReceiveData += (s, e1) =>
                                   {
                                      ba = (byte[]) e1.DataReceive;
                                      if (ba.Length <= 0)
                                      {
                                           ia = false;
                                           return;
                                      }

                                      this.Invoke(new MethodInvoker(()=>
                                                             {
                                                                this.Text = "dddd";
                                                                  
                                                              }));
                                          
                                      ia = true;
                                        
                                      au.Set();
                                          
                                   };

trans.Send(data);

au.WaitOne();

if (ia)
{}

那个lamba表达式是在串口 serialport 的 接收到数据的事件中回调的, 最大问题是在调用到 this.Invoke 的时候,程序就停了不动了????有没有人知道这是为什么啊?

Answer 1

我把断点打在  this.Text = "dddd"; 这句的时候,根本就没执行进来的?整个大的函数是在form的一个按钮事件中执行的

Answer 2

参考下我在VB.NET中调用Invoke的例子，给出更多的代码让我们了解你的问题：

Imports System
Imports System.IO.Ports
Public Class Form1
    Private received As String = String.Empty
    Dim WithEvents port As SerialPort = New  _
    System.IO.Ports.SerialPort("COM1", 9600, Parity.None, 8, StopBits.One)
    Public Delegate Sub myDelegate()
    Public Sub updateTextBox()
        With TextBox2
            .Font = New Font("Garamond", 12.0!, FontStyle.Bold)
            received = port.ReadTo("!%")
            .AppendText(received)
        End With
    End Sub
    Private Sub Form1_Load(ByVal sender As Object, ByVal e As  _
    System.EventArgs) Handles Me.Load
        CheckForIllegalCrossThreadCalls = False
        If port.IsOpen = False Then
            port.Open()
        End If
    End Sub
    Private Sub port_DataReceived(ByVal sender As Object, ByVal e As  _
    System.IO.Ports.SerialDataReceivedEventArgs) Handles port.DataReceived
        TextBox1.Invoke(New myDelegate(AddressOf updateTextBox), New Object() {})
        received = String.Empty
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If port.IsOpen = False Then
            port.Open()
        End If
        port.Write(TextBox1.Text & "!%")
        TextBox1.Text = ""
    End Sub
    Private Sub Form1_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
        If port.IsOpen <> False Then
            port.Close()
        End If
    End Sub
End Class

---

Best regards,
Riquel
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