在代码中设置 WPF 图片源 [英] Setting WPF image source in code

问题描述

我正在尝试在代码中设置 WPF 图像的源.图像作为资源嵌入到项目中.通过查看示例，我想出了以下代码.由于某种原因它不起作用 - 图像不显示.

I'm trying to set a WPF image's source in code. The image is embedded as a resource in the project. By looking at examples I've come up with the below code. For some reason it doesn't work - the image does not show up.

通过调试我可以看到流包含图像数据.怎么了?

By debugging I can see that the stream contains the image data. So what's wrong?

Assembly asm = Assembly.GetExecutingAssembly();
Stream iconStream = asm.GetManifestResourceStream("SomeImage.png");
PngBitmapDecoder iconDecoder = new PngBitmapDecoder(iconStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
ImageSource iconSource = iconDecoder.Frames[0];
_icon.Source = iconSource;

图标定义如下:<Image x:Name="_icon" Width="16" Height="16"/>

推荐答案

在遇到和你一样的问题并阅读了一些资料后，我找到了解决方案 - 打包 URI.

After having the same problem as you and doing some reading, I discovered the solution - Pack URIs.

我在代码中做了以下事情:

I did the following in code:

Image finalImage = new Image();
finalImage.Width = 80;
...
BitmapImage logo = new BitmapImage();
logo.BeginInit();
logo.UriSource = new Uri("pack://application:,,,/AssemblyName;component/Resources/logo.png");
logo.EndInit();
...
finalImage.Source = logo;

或者更短，通过使用另一个 BitmapImage 构造函数:

Or shorter, by using another BitmapImage constructor:

finalImage.Source = new BitmapImage(
    new Uri("pack://application:,,,/AssemblyName;component/Resources/logo.png"));

URI 被分成几个部分:

The URI is broken out into parts:

• 权限:application:///

• Path:编译成引用程序集的资源文件的名称.路径必须符合以下格式:AssemblyShortName[;Version][;PublicKey];component/Path

• AssemblyShortName:引用程序集的短名称.
• ;Version [可选]:包含资源文件的引用程序集的版本.这用于加载两个或多个具有相同短名称的引用程序集.
• ;PublicKey [可选]:用于对引用的程序集进行签名的公钥.这用于加载两个或多个具有相同短名称的引用程序集.
• ;component:指定被引用的程序集是从本地程序集引用的.
• /Path:资源文件的名称，包括其路径，相对于引用程序集的项目文件夹的根目录.

application: 后面的三个斜杠必须用逗号代替:

The three slashes after application: have to be replaced with commas:

注意:pack URI 的权限组件是一个嵌入的 URI，指向一个包并且必须符合 RFC 2396.此外，/"字符必须替换为，"字符，和保留字符，例如%"和 "?"必须逃脱.见 OPC详情.

Note: The authority component of a pack URI is an embedded URI that points to a package and must conform to RFC 2396. Additionally, the "/" character must be replaced with the "," character, and reserved characters such as "%" and "?" must be escaped. See the OPC for details.

当然，请确保将图像上的构建操作设置为 Resource.

And of course, make sure you set the build action on your image to Resource.

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