匿名方法作为BeginInvoke的参数? [英] Anonymous method as parameter to BeginInvoke?
问题描述
为什么不能将匿名方法作为参数传递给 BeginInvoke
方法?我有以下代码:
Why can't you pass an anonymous method as a parameter to the BeginInvoke
method? I have the following code:
private delegate void CfgMnMnuDlg(DIServer svr);
private void ConfigureMainMenu(DIServer server,)
{
MenuStrip mnMnu = PresenterView.MainMenu;
if (mnMnu.InvokeRequired)
{
mnMnu.BeginInvoke((CfgMnMnuDlg)ConfigureMainMenu,
new object[] { server});
}
else
{
// Do actual work here
}
}
我试图避免声明委托。为什么我不能写这样的东西呢?或者我可以,我只是无法弄清楚正确的语法?以下目前生成:
I'm trying to avoid declaring the delegate. Why can't I write something like the below instead? Or can I, and I just can't figure out the correct syntax? The below currently generates an:
参数类型匿名方法不能分配给参数类型System.Delegate
Argument type 'Anonymous method' is not assignable to parameter type 'System.Delegate'
好的,当然这是正确的,但是还有一些其他语法可以用来做到这一点(避免必须声明一个单独的委托才能使用 BeginInvoke()
?
Ok, that's right of course, but is there some other syntax I can use to do this (avoid having to declare a separate delegate in order to use BeginInvoke()
?
(能够做到这一点可以整齐地使用anon方法/ lamdas的概念代替在其他地方工作得如此干净的显式代表。)
(Being able to do this would fit in neatly with the concept of using anon methods/lamdas in place of explicit delegates which works so cleanly everywhere else.)
private void ConfigureMainMenu(DIServer server,)
{
MenuStrip mnMnu = PresenterView.MainMenu;
if (mnMnu.InvokeRequired)
{
mnMnu.BeginInvoke( // pass anonymous method instead ?
delegate(DIServer svr) { ConfigureMainMenu(server);},
new object[] { server});
}
else
{
// Do actual work here
}
}
推荐答案
尝试这样:
Try this:
control.BeginInvoke((MethodInvoker) delegate { /* method details */ });
或:
private void ConfigureMainMenu(DIServer server)
{
if (control.InvokeRequired)
{
control.BeginInvoke(new Action<DIServer >(ConfigureMainMenu), server);
}
else
{
/* do work */
}
}
或:
private void ConfigureMainMenu(DIServer server)
{
MenuStrip mnMnu = PresenterView.MainMenu;
if (mnMnu.InvokeRequired)
{
// Private variable
_methodInvoker = new MethodInvoker((Action)(() => ConfigureMainMenu(server)));
_methodInvoker.BeginInvoke(new AsyncCallback(ProcessEnded), null); // Call _methodInvoker.EndInvoke in ProcessEnded
}
else
{
/* do work */
}
}
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