C＃中：如何有效过滤（隐藏）ListView的项目，而在虚拟模式？ [英] C#: How to effectively filter (hide) ListView Items while in virtual mode?

问题描述

C＃：如何有效过滤（隐藏）ListView的项目，而在虚拟模式

C#: How to effectively filter (hide) ListView Items while in virtual mode?

我要寻找一种方式来过滤（隐藏/显示）中的ListView项目在虚拟模式。我有我的项目的列表视图项的数组缓存的，我怎么可能有效地使它所以只有特定的ListView项目在pressing一个过滤器按钮，然后所有的人都回来时，pressing一个不过滤显示按钮？

I am looking for a way to filter (hide/show) items in ListView in Virtual Mode. I have my items cached in an array of listview items, how could I effectively make it so only specific listview items are displayed when pressing a filter-button, and then all of them back when pressing a not-filter button?

推荐答案

您需要将您的映射可视行列表，这样，当RetrieveVirtualItem请求一个项目，它要求到您筛选的列表只包含可见项。

You'll need to map your list of visible rows, so that when RetrieveVirtualItem requests an item, it requests into your filtered list that only contains visible items.

如果您使用的是CacheVirtualItems存储ListViewItems，你需要更新缓存时，应用过滤，删除所有不可见的行。你可能只想清除在该点的缓存来降低复杂性。

If you're using CacheVirtualItems to store ListViewItems, you'll need to update that cache when the filtering is applied, removing all non-visible rows. You may want to just clear the cache at that point to reduce complexity.

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