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.为什么我不能写类似下面的东西呢?或者我可以，我只是想不出正确的语法?以下当前生成:

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"不可分配给参数类型System.Delegate"

Argument type 'Anonymous method' is not assignable to parameter type 'System.Delegate'

好的，这当然是对的，但是我可以使用其他语法来执行此操作(避免为了使用 BeginInvoke() 而声明单独的委托吗?

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()?

(能够做到这一点将完全符合使用匿名方法/lamdas 代替显式委托的概念，这在其他任何地方都非常干净.)

(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

试试这个:

control.BeginInvoke((MethodInvoker) delegate { /* method details */ });

或者:

private void ConfigureMainMenu(DIServer server)
{
    if (control.InvokeRequired)
    {
        control.BeginInvoke(new Action<DIServer >(ConfigureMainMenu), server);
    }
    else
    {
        /* do work */
    }
}

或者:

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 */
    }
}

这篇关于匿名方法作为 BeginInvoke 的参数?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！