ListView<-> ImageList将不同步 [英] ListView <--> ImageList Will Not Sync

问题描述

我正在使用ListView加载和显示图像文件的缩略图.我用于每个ListViewItem的名称"或键是完全限定的文件名.

I am using a ListView to load and display thumbnails for image files. The "Name" or key that I'm using for each ListViewItem is the fully-qualified file name.

我还创建了一个ImageList，该ImageList使用相同的键加载这些文件的缩略图.我已将此ImageList分配为ListView的"SmallImageList"属性.

I have also created an ImageList which loads thumbnails of those files using the same key. I've assigned this ImageList as the "SmallImageList" property of the ListView.

添加和删除文件时，我会通过键从ListView.Items和ImageList.Images集合中添加和删除它们.

When I add and remove files, I add and remove them by key from both the ListView.Items and the ImageList.Images collections.

在加载许多图像时，所有这些都可以正常工作.但是，当我尝试删除给定键时，ListView控件不再能正确显示缩略图.

All of this works fine when loading many images. However, when I try deleting a given key, the ListView control no longer displays the thumbnails properly.

删除项目前后:

当我在调试过程中分析内存中的两个集合数组时，键完美对齐.

When I analyze both collection arrays in memory during debugging, the keys line up perfectly.

使用的代码:

// Add the images from an array of paths
foreach (string xFile in files)
{
    thumbnails_imageList.Images.Add(xFile, images[xFile]);
    files_lst.Items.Add(xFile, Path.GetFileNameWithoutExtension(xFile), xFile);
}

// Delete the selected key(s)
foreach (ListViewItem xItem in files_lst.SelectedItems)
{
    files_lst.Items.Remove(xItem);
    thumbnails_imageList.Images.RemoveByKey(xItem.Name);
}

推荐答案

发生的事情很清楚，如果您将ListViewItem绑定到图像索引5，并且删除了位置4的图像，则这5个移位减小到4，并且该项目保留对5的引用，因此不会显示任何图像.

what happens is clear, if you have a ListViewItem bound to image index 5 and you delete the image in position 4, the 5 shifts down to 4 and the item keeps a reference to the 5 so does not show any image.

我认为在删除选定的ListView项时，不应从ImageList中删除图像.

I think you should not remove the images from the ImageList when you remove the selected ListView items.

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