blocks|key|5348888|text|你有没有尝试过beginupdate()和endupdate()？使用beginupdate+/endupdate添加数据要快得多(当你调用beginupdate时，listview直到你调用endupdate才会绘制)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5348889|listView1.BeginUpdate();
for+(int+i+=+0;+i+<+20000;+i%2B%2B)
{
listView1.Items.Add("abdc",+1);
}
listView1.EndUpdate();|code-block|syntax|javascript|5348890|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Did you try beginupdate() and endupdate()? Adding data is much faster when you use beginupdate/endupdate.(when you call beginupdate, listview doesn't draw until you call endupdate)

<pre><code>listView1.BeginUpdate();
for (int i = 0; i &lt; 20000; i++)
{
listView1.Items.Add("abdc", 1);
}
listView1.EndUpdate();
</code></pre>

blocks|key|2238758|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2238759|基本上，您将需要将排序应用于数据泵本身。|blockquote|2238760|2238761|2238762|我在谷歌上快速搜索了一下listview+sort+virtualmode。第一个结果是this+page，上面的引文就来自于此。|offset|length|2238763|例如，如果您的数据源是DataView，则对其应用排序，而不是对ListView应用排序。|2238764|如果只是添加项目时的性能问题，我会按照barism的建议做；使用BeginUpdate/EndUpdate而不是VirtualMode。|2238765|try+{
++listView1.BeginUpdate();
++//+add+items
}
finally+{
++listView1.EndUpdate();
}|code-block|syntax|javascript|2238766|entityMap|0|LINK|mutability|MUTABLE|url|http://www.google.dk/search?q=listview%2Bsort%2Bvirtualmode&rlz=|1|http://social.msdn.microsoft.com/forums/en-US/winforms/thread/39066e2f-b9c5-4ad2-a15c-0a29d5b66b3a/|2|https://stackoverflow.com/questions/1366743/how-to-sort-listview-items-when-listview-is-in-virtualmode/1366786#1366786^0|0|0|0|0|C|P|0|18|9|1|0|0|J|6|2|0|0^^$0|@$1|2|3|-4|4|5|6|14|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|15|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|16|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|17|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|18|7|@]|8|@$H|19|I|1A|1|1B]|$H|1C|I|1D|1|1E]]|9|$]]|$1|J|3|K|4|5|6|1F|7|@]|8|@]|9|$]]|$1|L|3|M|4|5|6|1G|7|@]|8|@$H|1H|I|1I|1|1J]]|9|$]]|$1|N|3|O|4|P|6|1K|7|@]|8|@]|9|$Q|R]]|$1|S|3|-4|4|5|6|1L|7|@]|8|@]|9|$]]]|T|$U|$4|V|W|X|9|$Y|Z]]|10|$4|V|W|X|9|$Y|11]]|12|$4|V|W|X|9|$Y|13]]]]

<blockquote>
 basically, you will need to apply sort to the data pump itself.
</blockquote>

I did a quick search on Google for <a href="http://www.google.dk/search?q=listview+sort+virtualmode&amp;rlz=" rel="nofollow noreferrer">listview sort virtualmode</a>. First result was <a href="http://social.msdn.microsoft.com/forums/en-US/winforms/thread/39066e2f-b9c5-4ad2-a15c-0a29d5b66b3a/" rel="nofollow noreferrer">this page</a>, where the above quote was taken from.

For example, if your datasource is a DataView, apply sorting on this instead of the ListView.

If it is just a question of performance when adding items, I would do as <a href="https://stackoverflow.com/questions/1366743/how-to-sort-listview-items-when-listview-is-in-virtualmode/1366786#1366786">barism</a> suggests; use BeginUpdate/EndUpdate instead of VirtualMode.

<pre><code>try {
 listView1.BeginUpdate();
 // add items
}
finally {
 listView1.EndUpdate();
}
</code></pre>

blocks|key|5348995|text|如果使用的是虚拟模式，则必须对基础数据源进行排序。正如您可能已经发现的，ListViewItemSorter对虚拟列表什么也不做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5348996|如果您正在使用非虚拟列表视图，则还可以使用AddRange()，它比一系列Add()快得多--除了使用前面已经介绍过的BeginUpdate/EndUpdate之外。|5348997|ObjectListView+(围绕.NET+WinForms+ListView的开源包装器)已经使用了所有这些技术来提高速度。与普通ListView相比，这是一个很大的改进。它同时支持普通模式和虚拟模式列表视图，并使它们更易于使用。例如，排序是完全自动处理的。|offset|length|5348998|entityMap|0|LINK|mutability|MUTABLE|url|http://www.codeproject.com/KB/list/objectlistview.aspx^0|0|0|0|E|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

If you are using virtual mode, you have to sort your underlying data source. As you may have found, ListViewItemSorter does nothing for virtual lists.

If you are using a non-virtual listview, you can also use AddRange(), which is significantly faster than a series of Add() -- In addition to using BeginUpdate/EndUpdate that has already been described.

<a href="http://www.codeproject.com/KB/list/objectlistview.aspx" rel="nofollow noreferrer">ObjectListView</a> (an open source wrapper around .NET WinForms ListView) already uses all these techniques to make itself fast. It is a big improvement over a normal ListView. It supports both normal mode and virtual mode listviews, and make them both much easier to use. For example, sorting is handled completely automatically.

blocks|key|324989|text|对于非常大的列表，虚拟模式ListView肯定是答案。在非虚拟模式下，它似乎绘制整个列表，然后将其裁剪到视图中，而在虚拟模式下，它只是在视图中绘制列表。在我的例子中，列表是40K%2B记录。在非虚拟模式下，更新ListView可能需要几分钟时间。在虚拟模式下，它是瞬时的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|324990|要对列表进行排序，必须对基础数据源进行排序，如前所述。这是最简单的部分。您还需要强制刷新显示，这不是自动完成的。在排序之前，可以使用ListView.TopItem.Index在基础数据源中查找与虚拟ListView的顶行相对应的索引。还有一个API调用返回您可以作为C#函数实现的ListView中的显示行数，如下所示：|324991|public+const+Int32+LVM_GETCOUNTPERPAGE+=+0x1040;

public+static+int+GetListViewRows(+ListView+xoView+)+
{
+++return+(int)WindowsMessage.SendMessage(+xoView.Handle,+LVM_GETCOUNTPERPAGE,+0,+0+);
}|code-block|syntax|javascript|324992|这将允许您计算您必须更新的范围。剩下的唯一问题是如何使现有显示与数据排序后显示的内容保持一致。如果您希望将相同的数据元素保留在顶部行，则必须具有某种机制，以便在新排序的列表中找到它的新索引，这样您就可以将其替换到顶部位置-本质上相当于SQL标识。|324993|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For very large lists, the Virtual Mode ListView is the answer for certain. In non-virtual mode it seems to draw the entire list and then clip it to the view, while in Virtual mode it simply draws the ones in the view. In my case the list was 40K+ records. In non-virtual mode an update to the ListView could take minutes. In virtual mode it was instantaneous.

To sort the list, you must sort the underlying datasource, as has already been mentioned. That is the easy part. You will also need to force a refresh to the display, which is not done automatically. You can use ListView.TopItem.Index to find the index in the underlying data source that corresponds to the top row of the Virtual ListView before the sort. There is also an API call that returns the number of display rows in the ListView that you can implement as C# function, like this:

<pre><code>public const Int32 LVM_GETCOUNTPERPAGE = 0x1040;

public static int GetListViewRows( ListView xoView ) 
{
 return (int)WindowsMessage.SendMessage( xoView.Handle, LVM_GETCOUNTPERPAGE, 0, 0 );
}
</code></pre>

That will let you calculate the range you have to update. About the only remaining question is how you reconcile the existing display with what will appear after the data have been sorted. If you want to leave the same data element in the top row, you must have some mechanism in place that will find its new index in the newly sorted list, so you can replace it in the top position - something essentially equivalent to an SQL IDENTITY.

blocks|key|2238835|text|我在现有项目中切换VirtualMode+True时也遇到了同样的问题，但解决方案却出奇地简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2238836|第一步，我要填充一个ListViewItem列表，而不是ListView.Items集合：|2238837|private+List<ListViewItem>+_ListViewItems;|code-block|syntax|javascript|2238838|然后，我实现了RetrieveVirtualItem方法|2238839|private+void+mLV_RetrieveVirtualItem(object+sender,+RetrieveVirtualItemEventArgs+e)
{
++++e.Item+=+_ListViewItems[e.ItemIndex];
}|2238840|最后，我使用与之前相同的类对ListViewItem列表进行排序，我只需更改基类|2238841|_ListViewItems.Sort((System.Collections.Generic.IComparer<ListViewItem>)new+ListViewItemComparer(new+int[]+{+e.Column+},+mLV.Sorting));|2238842|这是我的IComparer类实现：|2238843|class+ListViewItemComparer+:+System.Collections.Generic.IComparer<ListViewItem>
{
++++int[]+mColonne;
++++private+System.Windows.Forms.SortOrder+order;
++++public+ListViewItemComparer(int[]+mCols)
++++{
++++++++this.mColonne+=+mCols;
++++++++this.order+=+System.Windows.Forms.SortOrder.Ascending;
++++}

++++public+ListViewItemComparer(int[]+mCols,+System.Windows.Forms.SortOrder+order)
++++{
++++++++this.mColonne+=+mCols;
++++++++this.order+=+order;
++++}

++++public+int+Compare(ListViewItem+x,+ListViewItem+y)
++++{
++++++++int+returnVal+=+-1;

++++++++foreach+(int+mColonna+in+mColonne)
++++++++{
++++++++++++double+mNum1;
++++++++++++double+mNum2;

++++++++++++String+mStr1+=+"";
++++++++++++String+mStr2+=+"";

++++++++++++if+((x.SubItems[mColonna].Text+==+"NULL")+&&+(x.SubItems[mColonna].ForeColor+==+Color.Red))
++++++++++++{
++++++++++++++++mStr1+=+"-1";
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++mStr1+=+x.SubItems[mColonna].Text;
++++++++++++}

++++++++++++if+((y.SubItems[mColonna].Text+==+"NULL")+&&+(y.SubItems[mColonna].ForeColor+==+Color.Red))
++++++++++++{
++++++++++++++++mStr2+=+"-1";
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++mStr2+=+y.SubItems[mColonna].Text;
++++++++++++}


++++++++++++if+((double.TryParse(mStr1,+out+mNum1)+==+true)+&&+(double.TryParse(mStr2,+out+mNum2)+==+true))
++++++++++++{
++++++++++++++++if+(mNum1+==+mNum2)
++++++++++++++++{
++++++++++++++++++++returnVal+=+0;
++++++++++++++++}
++++++++++++++++else+if+(mNum1+>+mNum2)
++++++++++++++++{
++++++++++++++++++++returnVal+=+1;
++++++++++++++++}
++++++++++++++++else
++++++++++++++++{
++++++++++++++++++++returnVal+=+-1;
++++++++++++++++}
++++++++++++}
++++++++++++else+if+((double.TryParse(mStr1,+out+mNum1)+==+true)+&&+(double.TryParse(mStr2,+out+mNum2)+==+false))
++++++++++++{
++++++++++++++++returnVal+=+-1;
++++++++++++}
++++++++++++else+if+((double.TryParse(mStr1,+out+mNum1)+==+false)+&&+(double.TryParse(mStr2,+out+mNum2)+==+true))
++++++++++++{
++++++++++++++++returnVal+=+1;
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++returnVal+=+String.Compare(mStr1,+mStr2);
++++++++++++}

++++++++++++if+(returnVal+!=+0)
++++++++++++{
++++++++++++++++break;
++++++++++++}
++++++++}

++++++++//+Determine+whether+the+sort+order+is+descending.
++++++++if+(order+==+System.Windows.Forms.SortOrder.Descending)
++++++++{
++++++++++++//+Invert+the+value+returned+by+String.Compare.
++++++++++++returnVal+*=+-1;
++++++++}
++++++++return+returnVal;
++++}
}|2238844|希望这能对你有所帮助。|2238845|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|17|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

I had the same problem switching VirtualMode True with an existing project, but the solution was surprisingly easy:

First step I am populating a list of ListViewItem, instead of ListView.Items collection:

<pre><code>private List&lt;ListViewItem&gt; _ListViewItems;
</code></pre>

Then I have implemented the RetrieveVirtualItem method

<pre><code>private void mLV_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
{
 e.Item = _ListViewItems[e.ItemIndex];
}
</code></pre>

Finally I am sorting my list of ListViewItem using the same class I was using before, I had just only to change the base class

<pre><code>_ListViewItems.Sort((System.Collections.Generic.IComparer&lt;ListViewItem&gt;)new ListViewItemComparer(new int[] { e.Column }, mLV.Sorting));
</code></pre>

This is my IComparer class implementation:

<pre><code>class ListViewItemComparer : System.Collections.Generic.IComparer&lt;ListViewItem&gt;
{
 int[] mColonne;
 private System.Windows.Forms.SortOrder order;
 public ListViewItemComparer(int[] mCols)
 {
 this.mColonne = mCols;
 this.order = System.Windows.Forms.SortOrder.Ascending;
 }

 public ListViewItemComparer(int[] mCols, System.Windows.Forms.SortOrder order)
 {
 this.mColonne = mCols;
 this.order = order;
 }

 public int Compare(ListViewItem x, ListViewItem y)
 {
 int returnVal = -1;

 foreach (int mColonna in mColonne)
 {
 double mNum1;
 double mNum2;

 String mStr1 = "";
 String mStr2 = "";

 if ((x.SubItems[mColonna].Text == "NULL") &amp;&amp; (x.SubItems[mColonna].ForeColor == Color.Red))
 {
 mStr1 = "-1";
 }
 else
 {
 mStr1 = x.SubItems[mColonna].Text;
 }

 if ((y.SubItems[mColonna].Text == "NULL") &amp;&amp; (y.SubItems[mColonna].ForeColor == Color.Red))
 {
 mStr2 = "-1";
 }
 else
 {
 mStr2 = y.SubItems[mColonna].Text;
 }


 if ((double.TryParse(mStr1, out mNum1) == true) &amp;&amp; (double.TryParse(mStr2, out mNum2) == true))
 {
 if (mNum1 == mNum2)
 {
 returnVal = 0;
 }
 else if (mNum1 &gt; mNum2)
 {
 returnVal = 1;
 }
 else
 {
 returnVal = -1;
 }
 }
 else if ((double.TryParse(mStr1, out mNum1) == true) &amp;&amp; (double.TryParse(mStr2, out mNum2) == false))
 {
 returnVal = -1;
 }
 else if ((double.TryParse(mStr1, out mNum1) == false) &amp;&amp; (double.TryParse(mStr2, out mNum2) == true))
 {
 returnVal = 1;
 }
 else
 {
 returnVal = String.Compare(mStr1, mStr2);
 }

 if (returnVal != 0)
 {
 break;
 }
 }

 // Determine whether the sort order is descending.
 if (order == System.Windows.Forms.SortOrder.Descending)
 {
 // Invert the value returned by String.Compare.
 returnVal *= -1;
 }
 return returnVal;
 }
}
</code></pre>

Hope this will help you.

I realize i have to sort the collection where the ListView gathers the items from: 
ListView listCollection = new ListView();

But this doesn't seem to work unless the ListView is added as a GUI-control to the form, that in turn makes it very slow to add items to, hence why i have to use VirtualMode on my GUI-ListView in the first place.

Anyone know how to go about this or point me in the right direction?

How to sort ListView items when ListView is in VirtualMode?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋 

腾讯云代码助手

CODING DevOps

Cloud Studio

SDK中心

API中心

命令行工具

我意识到我必须对ListView从中收集项的集合进行排序：新的listCollection = ListView ListView()；但是，除非将ListView作为图形用户界面控件添加到表单中，否则这似乎不起作用，这反过来会使向其中添加项目变得非常慢，因此我必须首先在图形界面上使用VirtualMode。有谁知道怎...

问当ListView在VirtualMode中时如何对ListView项进行排序？
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问当ListView在VirtualMode中时如何对ListView项进行排序？EN