Can't get items in a ListView cross-thread

问题

My background worker needs to iterate through each item in a ListView. However I can't do this:

foreach (ListViewItem Item in List.Items)

because it's a cross thread operation.

I also can't put the items in a ListView.ListViewItemCollection and make the background worker read from that. This is still trying to access the ListView and creating a cross thread operation.

How can I make the ListView's items available to the background worker without putting them in a variable somewhere?

回答1:

Try using this function.

private delegate ListView.ListViewItemCollection GetItems(ListView lstview);

private ListView.ListViewItemCollection getListViewItems(ListView lstview)
{
    ListView.ListViewItemCollection temp = new ListView.ListViewItemCollection(new ListView());
    if (!lstview.InvokeRequired)
    {
        foreach (ListViewItem item in lstview.Items)
        temp.Add((ListViewItem)item.Clone());
        return temp;
    }
    else
        return (ListView.ListViewItemCollection)this.Invoke(new GetItems(getListViewItems), new object[] { lstview });
}

Call it like this:

foreach(ListViewItem item in getListViewItems(List))

回答2:

I agree with mdb, but have to mention that depending on importance of application,

Control.CheckForIllegalCrossThreadCalls = false;

can still be used as a temp quick fix.

回答3:

try this.

public Form1()
{
    InitializeComponent();

    Control.CheckForIllegalCrossThreadCalls = false;
}

来源：https://stackoverflow.com/questions/8022825/cant-get-items-in-a-listview-cross-thread