blocks|key|2066863|text|我试过一次，但我认为这是不可能的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2066864|如果您尝试将ImageKey和ImageIndex都设置为“未设置”值，则控件只会将ImageIndex默认设置为0。以下代码：|offset|length|style|CODE|2066865|treeView.ImageKey+=+"Value";
Debug.WriteLine(treeView.ImageIndex);
treeView.ImageKey+=+null;
Debug.WriteLine(treeView.ImageIndex);
treeView.ImageIndex+=+-1;
Debug.WriteLine(treeView.ImageIndex);|code-block|syntax|javascript|2066866|生成输出：|2066867|-1
0
0|2066868|这种方式告诉您，控件开发人员希望确保始终存在默认图像。我担心，这只会给你留下黑客的选择。|2066869|entityMap^0|0|6|8|F|A|16|A|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|T|$]]

I tried this once and I don't think it is possible.

If you try to set both <code>ImageKey</code> and <code>ImageIndex</code> to "not set" values the control just defaults <code>ImageIndex</code> to 0. The following code:

<pre><code>treeView.ImageKey = "Value";
Debug.WriteLine(treeView.ImageIndex);
treeView.ImageKey = null;
Debug.WriteLine(treeView.ImageIndex);
treeView.ImageIndex = -1;
Debug.WriteLine(treeView.ImageIndex);
</code></pre>

Produces output:

<pre><code>-1
0
0
</code></pre>

This kind of tells you that the control developers wanted to make sure that there was always a default image. That just leaves you with the hack options I'm afraid.

blocks|key|2066918|text|您需要将ImageIndex和SelectedImageIndex设置为一个大于ImageList中的值数的数字。例如，如果您创建此节点并将其添加到TreeView中|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2066919|TreeNode+node1+=+new+TreeNode(string.Empty,+12,+12);+//+imageList1.Count+=+5|code-block|syntax|javascript|2066920|您将在TreeView中插入一个不可见的TreeNode。我改变了我的TreeView的背景颜色，但它仍然是看不见的。|2066921|(我用谷歌搜索了一段时间，最终在这里找到了答案：http://www.tech-archive.net/Archive/DotNet/microsoft.public.dotnet.framework.windowsforms/2006-09/msg00322.html)|2066922|entityMap|0|LINK|mutability|MUTABLE|url|http://www.tech-archive.net/Archive/DotNet/microsoft.public.dotnet.framework.windowsforms/2006-09/msg00322.html^0|4|A|F|I|14|9|22|8|0|0|3|8|K|8|Z|8|0|O|33|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1D|8|@]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|O|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

You need to set <code>ImageIndex</code> and <code>SelectedImageIndex</code> to a number that is higher than the number of values in your <code>ImageList</code>. For example, if you create this node and add it to your <code>TreeView</code>:

<pre><code>TreeNode node1 = new TreeNode(string.Empty, 12, 12); // imageList1.Count = 5
</code></pre>

you will have an invisible <code>TreeNode</code> inserted into your <code>TreeView</code>. I changed the background color of my <code>TreeView</code> and it was still invisible.

(I googled this for some time, and I eventually found the answer here: <a href="http://www.tech-archive.net/Archive/DotNet/microsoft.public.dotnet.framework.windowsforms/2006-09/msg00322.html" rel="nofollow noreferrer">http://www.tech-archive.net/Archive/DotNet/microsoft.public.dotnet.framework.windowsforms/2006-09/msg00322.html</a>)

blocks|key|2066979|text|我选择做的是使用点的图像来表示那些不应该有图像的TreeView节点。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2066980|​|2066981|📷|atomic|2066982|2066983|我将此图像添加为列表中的最后一个图像，如果该项目不应包含图像，则将其设置为ImageList.Images.Count-1|2066984|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/ff4ab43d0c56810bf029a2c25c713926.png|imageAlt^0|O|8|0|0|0|1|0|0|0|11|O|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|K|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|N|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U|V|-4]]]]

What I have chosen to do is to use an image of dots for those <code>TreeView</code> nodes that are not supposed to have an image.

<img src="https://i.stack.imgur.com/5UT6j.png" alt="TreeNode with image dots">

I add this image as the last image in the list, and if the item is not supposed to have an image I set it to <code>ImageList.Images.Count-1</code>

blocks|key|2067009|text|嘿，兄弟，我找到了一种方法。将第一个图像设置为空图像，如下所示...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2067010|TreeView+treeView+=+new+TreeView();
treeView.ImageList.Images.Add(new+Bitmap(1,1));|code-block|syntax|javascript|2067011|因此，索引0是一个空图像。我希望这能帮到你|2067012|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Hei bro, i found a way.
Set the first image as an empty image, like this...

<pre><code>TreeView treeView = new TreeView();
treeView.ImageList.Images.Add(new Bitmap(1,1));
</code></pre>

So, the index 0 is an empty image.
I hope this helps

blocks|key|2067016|text|我发现在TreeView上使用StateImageList而不是ImageList只会在TreeNode上的StateImageIndex等于或大于0时显示图像|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2067017|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I found that using StateImageList on the TreeView instead of ImageList will only show the image when StateImageIndex on the TreeNode is equal or greater than 0

I have a <code>TreeView</code> windows forms control with an <code>ImageList</code>, and I want some of the nodes to display images, but the others to not have images.

I don't want a blank space where the image should be. I don't want an image that looks like the lines that the TreeView would draw if it didn't have an ImageList. How do I get it to draw images for some items and not others, without resorting to clumsy hacks like that?

How do I set an image for some but not all nodes in a TreeView?

我有一个带有ImageList的TreeView windows窗体控件，我希望其中一些节点显示图像，但其他节点不显示图像。我不想在图像应该出现的地方留出空格。我不希望图像看起来像没有ImageList时TreeView会绘制的线条。我如何让它为一些项目而不是其他项目绘制图像，而不是求助于像那样笨拙的黑客？

问如何为TreeView中的某些节点而不是所有节点设置图像？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何为TreeView中的某些节点而不是所有节点设置图像？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何为TreeView中的某些节点而不是所有节点设置图像？
EN