WPF整理-二進制資源和內容
WPF中的Binary Resource(二進制資源)是相對于前面所說的Logical resource(邏輯資源)而說的，一般指Image、XML文件等。
注意：這里說的是Resource"資源"，和Content"內容"是不同的。
1.Content VS Resource
一般我們向工程中添加一個二進制的資源，如圖片。我們設置它的屬性，設置成資源和內容是不同的！
簡單的說下兩者的區別：
“When the Build Action is set to Content (as in the jellyfish example), the resource is not
included in the assembly. This makes it more appropriate when the resource needs to change
often (perhaps by a designer) and a rebuild would be undesirable. Also, if the resource is
large, and not always needed, it's better to leave it off to the resulting assembly. Note that to
access the resource, the exact same syntax is used. This is possible because WPF adds the
AssemblyAssociatedContentFile attribute to the assembly, specifying the name of the
resource file. Here's a view with .NET Reflector:”
“That's why we were able to replace the jellyfish image with a desert image and get it to show
correctly given the name jellyfish.jpg without doing any kind of rebuilding.”
WHILE
“When the Build Action is set to Resource, the image file is stored as a resource inside the compiled
assembly. This is because the Build Action was set to Resource on the image. This makes
the actual image file unnecessary when deploying the application.
These resources are part of the assembly and are stored in a resource named
MyApplication.g.resources, where MyApplication is the name of the
assembly. Here's a snapshot from .NET Reflector:”
2.Access
對于Image，無論設置成Content，還是Resource，都可以很方便的訪問，如下：
xaml中
<Image Source="Images/5.png" Width="100" Height="100" /> <Image Source="Images/6.png" Width="100" Height="100" />
C#中
image1.Source = new BitmapImage(new Uri("Images/5.png", UriKind.Relative)); image2.Source = new BitmapImage(new Uri("Images/6.png", UriKind.Relative));
并沒有區別。
3.Point of Interest
其他的，如xml file，兩者訪問方法就有區別了！
“Accessing a binary resource in XAML is pretty straightforward, but this works for standard
resources such as images. Other types of resources may be used in code, and this requires
a different approach.”
譬如有這樣的一個xml file
如果，我們將生產操作設置成為Content，則我們可以這樣訪問：
var books = XElement.Load("Xml/books.xml"); var bookList = from book in books.Elements("Book") orderby (string)book.Attribute("Author") select new { Name=(string)book.Attribute("Name"), Author=(string)book.Attribute("Author") }; foreach (var book in bookList) { txtBook.Text += book.ToString() + Environment.NewLine; }
或者是：
var info = Application.GetContentStream(new Uri("Xml/books.xml", UriKind.Relative)); var books = XElement.Load(info.Stream); var bookList = from book in books.Elements("Book") orderby (string)book.Attribute("Author") select new { Name=(string)book.Attribute("Name"), Author=(string)book.Attribute("Author") }; foreach (var book in bookList) { txtBook.Text += book.ToString() + Environment.NewLine; }
如果設置成Resource，則以上程序會報告無法找到xml file。
因此，設置成Resource時，我們應該這樣訪問：
var info = Application.GetResourceStream(new Uri("Xml/books.xml", UriKind.Relative)); var books = XElement.Load(info.Stream); var bookList = from book in books.Elements("Book") orderby (string)book.Attribute("Author") select new { Name=(string)book.Attribute("Name"), Author=(string)book.Attribute("Author") }; foreach (var book in bookList) { txtBook.Text += book.ToString() + Environment.NewLine; }
兩種情況下，程序運行如下：
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