VB.NET RaiseEvent，线程安全? [英] VB.NET RaiseEvent, threadsafe?

问题描述

是 RaiseEvent 线程安全吗?

在 C# 中编写

if (event != null)
{
    event.invoke();
}

并且 C# 代码不是线程安全的....

and the C# code is not thread safe....

推荐答案

如果我需要做线程安全事件，我这样写:

If I need to do thread safe events, I write this:

Class Test

    Public Event Click(ByVal sender As Object, ByVal e As EventArgs)
    Public Event MouseIn(ByVal sender As Object, ByVal e As EventArgs)

    Private Delegate Sub EventArgsDelegate(ByVal e As EventArgs)
    Private ReadOnly _parent As Control

    Public Sub New(ByVal parent As Control)
        _parent = parent
    End Sub

    Private Sub OnClick(ByVal e As EventArgs)

        If _parent.InvokeRequired Then
            _parent.Invoke(New EventArgsDelegate(AddressOf OnClick), e)
        Else
            RaiseEvent Click(Me, e)
        End If

    End Sub

    Private Sub OnMouseIn(ByVal e As EventArgs)

        If _parent.InvokeRequired Then
            _parent.Invoke(New EventArgsDelegate(AddressOf OnMouseIn), e)
        Else
            RaiseEvent MouseIn(Me, e)
        End If

    End Sub

End Class

然后每当我需要引发事件时，我只使用 OnClick(new eventargs(...)) 等.如果您使用 Reflector 您可以观察到大多数线程安全控件都使用类似的系统.

Then whenever I need to raise the event I just use the OnClick(new eventargs(...)), etc. If you use Reflector you can observe that most thread safe controls use a similar system.

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