在另一个线程(winforms)上使用 IEnumrable 填充 ListBox

Populate ListBox with a IEnumrable on another thread (winforms)(在另一个线程(winforms)上使用 IEnumrable 填充 ListBox)

问题描述

我想知道填充 WinForm 的 ListBox 控件的最佳方法是什么，根据无线电 btn 填充?

I'm wondering what would be the best way to populate a ListBox control of a WinForm, populated depending on a radio btn?

我已经看到一些建议使用 foreach 循环遍历列表中的每个对象，并将它们 Add() 到 listBox.items.Add()，但这似乎是一个非常糟糕的主意，因为列表来自rabio btn 1 返回一个包含 10.000 条记录的列表(循环需要一些时间，并且 UI 在循环时冻结，这是个坏主意).

I have seen some suggestions to use a foreach to loop over each object of my list, and Add() them to the listBox.items.Add(), but this seems to be a really bad idea, since the list from rabio btn 1 returns a list with 10.000 records (takes quiet some time to loop over, and the UI freeze while looping, bad bad idea).

有没有更好的方法来做到这一点，也许在一个单独的任务中停止 UI 冻结??

Is there any better way to do this, and maybe in a seperated Task to stop UI freeze??

private void PopulateListBox()
{
    foreach (var item in Controller.ReturnBigResultSet())
            this.Invoke((MethodInvoker)(() => listBox1.Items.Add(item)));
}

var watch = new Stopwatch();
watch.Start();
var list = Controller.GetAllEntries().ToArray();
Debug.WriteLine("List returned in {0}s with a size of {1}", watch.Elapsed.TotalSeconds, list.Count<Lejlighed>());
watch.Restart();
listBox1.Items.AddRange(list);
watch.Stop();
Debug.WriteLine("Added {0} items in {1}s", listBox1.Items.Count, watch.Elapsed.TotalSeconds);

List returned in 3.8596527s with a size of 19022
Added 19022 items in 1.9223412s

this.listBox1.AddRange(array);

相当于使用下面的代码.首先调用 ListBox 的 >BeginUpdate 方法，然后使用循环将 Add 项添加到 Items 集合中，最后调用 EndUpdate:

Which is equivalent to using below code. First call BeginUpdate method of ListBox and then use a loop to Add items to Items collection and at last call EndUpdate:

this.listBox1.BeginUpdate();
foreach (var item in array)
{
    this.listBox1.Items.Add(item);
}
this.listBox1.EndUpdate();

看看 来源AddRange 方法的代码.

Take a look at source code of AddRange method.

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