Windows的C＃的CheckedListBox经过项目事件处理 [英] Windows C# CheckedListBox Checked Item Event Handling

问题描述

我目前正在开发使用CheckedListBoxes该计划的某些方面的窗口应用程序。我遇到的一个问题是，我一直在试图找到哪个事件，当一个项目被选中，这样我可以让任何时候列表项检查表单按钮被触发。

I'm currently developing a Window app that uses CheckedListBoxes for certain aspects of the program. A problem I've encountered is that I have been trying to find which event is triggered when an item is checked so that I can enable a form button when any list item is checked.

问题是，我试着用以下;

Problem is that I tried using the following;

private void clbAvailMods_ItemCheck(object sender, ItemCheckEventArgs e)
    {
        if(e.NewValue == CheckState.Checked)
        {
            btnInstall.Enabled = true;
        }
    }

但是当我设置一个断点的if语句，在检查列表框中的项目它永远不会触发。

but when I set a breakpoint on the if statement, it never fires upon checking an item in the listbox.

难道我做错了吗？

推荐答案

一个标准的Windows窗体诀窍是，直到所有事件的副作用已完成推迟运行的代码。你延迟运行的代码与Control.BeginInvoke（）方法。这将解决您的问题：

A standard Windows Forms trick is to delay running code until all event side-effects have been completed. You delay running code with the Control.BeginInvoke() method. This will fix your problem:

    private void checkedListBox1_SelectedIndexChanged(object sender, EventArgs e) {
        this.BeginInvoke(new MethodInvoker(evalList), null);
    }

    private void evalList() {
        bool any = false;
        for (int ix = 0; ix < checkedListBox1.Items.Count; ++ix) {
            if (checkedListBox1.GetItemChecked(ix)) {
                any = true;
                break;
            }
        }
        btnInstall.Enabled = any;
    }

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