Question

任何人都可以告诉我如何解决这个问题？我不断收到“跨线程操作无效错误”。我觉得我需要以某种方式在单独的线程中添加公共事件，但不知道如何。感谢

Public Class Form2
    Public WithEvents _tasks As New Tasks

    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        _tasks.StartThread()
    End Sub

    Public Sub task1(msg As String) Handles _tasks.DoTask1
        TextBox1.Text &= msg
    End Sub
End Class

Public Class Tasks
    Public Event DoTask1(msg As String)

    Public _thread As New Thread(AddressOf TasksThread)

    Public Sub StartThread()
        _thread.Start()
    End Sub

    Public Sub TasksThread()
        Do
            RaiseEvent DoTask1("1")
            Thread.sleep(1000)
        Loop While True
    End Sub
End Class

Answer 1

试试这个：

Public Sub task1(msg As String) Handles _tasks.DoTask1

    If TextBox1.InvokeRequired Then
        TextBox1.Invoke(Sub() TextBox1.Text &= msg)
    Else
        TextBox1.Text &= msg
    End If

End Sub

Answer 2

您正在从UI线程以外的线程修改UI控件。您需要将事件处理程序调用封送到Textbox1.Text。

有许多类似的SO问题和答案与此相关。这是one。

跨线程操作无效错误

2 个答案: