VB.NET RaiseEvent,线程安全? [英] VB.NET RaiseEvent, threadsafe?
本文介绍了VB.NET RaiseEvent,线程安全?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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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