在.NET避免重复图标资源（C＃）项目

问题描述

我使用Visual C＃2008 Express的。我想使用相同的图标为应用程序（即，显示了该.exe的图标），并为主要形式。不幸的是，VC＃似乎并没有被这个非常聪明，并坚持复制图标数据。

I'm using Visual C# 2008 Express. I'd like to use the same icon for the application (ie, the icon shown for the .exe), and for the main form. Unfortunately, VC# doesn't seem to be very smart about this, and insists on duplicating the icon data.

似乎没有成为一种选择的一种方式在窗体或项目图标（只选择文件），并使用这两个图标相同的文件用已嵌入图标只嵌入文件两次，据我所看到的。这不是什么大不了的事（硬盘空间是便宜了，对吧？），但它的错误我。

There doesn't seem to be a way of selecting an "already embedded" icon for use in the form or project icon (only selecting a file), and using the same file for both icons just embeds the file twice as far as I can see. It's not a big deal (hard drive space is cheap now, right?), but it bugs me.

任何想法如何避免这种情况？有没有办法在构建窗体时加载编程可执行文件的图标用，说什么？一对夫妇对类似的事情论坛帖子似乎表明，.NET资源不正常使用旧的Windows资源系统 - 有从旧式的资源获取的框架内的一种方式？或者，我必须绑定Win32 API函数做呢？

Any idea how to avoid this? Is there a way to programatically load the executable's icon for use when the form is constructed, say? A couple of forum posts about similar things seem to suggest that .NET resources don't use the normal old Windows resource system -- is there a way from within the framework of getting at the old-style resources? Or do I have to bind the Win32 API functions to do it?

推荐答案

是啊，这是相当烦人。但随着Icon.ExtractAssociatedIcon的建议回答的问题是，它将检索32x32的图标，然后下采样，以在表单窗口或在任务栏上一个16x16的图标，这将看起来很糟糕，除非你的32x32的图标非常巧妙地构造。

Yeah, it's pretty annoying. But the problem with the proposed answer of Icon.ExtractAssociatedIcon is that it will retrieve the 32x32 icon, and then downsample to a 16x16 icon in your forms window or on the taskbar, which will look terrible unless your 32x32 icon is very cleverly constructed.

我在做它的方式是互操作（把你的表单构造的第一行）：

The way I'm doing it is with interop (put the first line in your form constructor):

this.Icon = ExtractSmallIconFromLibrary(Application.ExecutablePath);
...

public static Icon ExtractSmallIconFromLibrary(string file) {
    IntPtr[] reficon = new IntPtr[1];
    int nextracted = ExtractIconEx(file, 0, null, reficon, 1);
    if (nextracted < 1)
        return null;
    Icon unmanaged_icon = Icon.FromHandle(reficon[0]);
    Icon icon = (Icon)unmanaged_icon.Clone();
    DestroyIcon(unmanaged_icon.Handle);
    return icon;
}

[DllImport("Shell32", CharSet = CharSet.Auto)]
extern static int ExtractIconEx(
    [MarshalAs(UnmanagedType.LPTStr)]
    string lpszFile,
    int nIconIndex,
    IntPtr[] phIconLarge,
    IntPtr[] phIconSmall,
    int nIcons
    );

[DllImport("user32.dll", CharSet = CharSet.Auto)]
extern static bool DestroyIcon(IntPtr handle);

但是，这是不是很大，或者说，因为你的不的希望32x32的图标之类的使用Alt-Tab图标列表。所以，你真的需要提取的全部的图标，这是一个更大的工作。也许有两个图标组合成一个简单方法。或者你可以像这样计划，其中有一大堆提取摆在首位，整个图标代码。

But this isn't great, either, since you do want the 32x32 icon for things like the Alt-Tab icon list. So you really need to extract the entire icon, which is a bigger job. Maybe there's a straightforward way to combine the two icons into one. Or you can do like this codeproject program, which extracts the whole icon in the first place with a huge pile of code.

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