Page 20 - DCAP408_WEB_PROGRAMMING

Windows Programming

Notes
Did u know? Each method takes the resource key as an input parameter, and returns a
loosely typed object.
Typically, a resource key is a string, but there are infrequent non-string usages; see the Using
Objects as Keys section for details. Usually you would cast the returned object to the type
required by the property that you are setting when requesting the resource.

!

Caution The lookup logic for code resource resolution is the similar as the dynamic resource
reference XAML case.
The hunt for resources starts from the calling element, then persists to successive parent elements
in the logical tree. The lookup continues onwards into application resources, themes, and system
resources if essential. A code demand for a resource will properly account for runtime modifies
in resource dictionaries that might have been made succeeding to that resource dictionary being
loaded from XAML, and also for real-time system resource m.

Example: The following is a concise code example that locates a resource by key and
utilizes the returned value to put a property, executed as a Click event handler.

1.7.2 Creating Resources with Code

If you want to generate a whole WPF application in code, you might also desire to create any
resources in that application in code. To attain this, create a new Resource Dictionary instance,
and then add all the resources to the dictionary by means of successive calls to Resource
Dictionary.Add. Then, use the Resource Dictionary thus generated to set the Resources property
on an element that is present in a page scope, or the Application.Resources. You could also
preserve the Resource Dictionary as a separate object without adding it to an element. On the
other hand, if you do this, you must access the resources within it by item key, as if it were a
generic dictionary. A Resource Dictionary that is not associated to an element Resources property
would not occur as part of the element tree and has no scope in a lookup sequence that can be
used by Find Resource and associated methods.

1.7.3 Different Data Types used in Resource File

Microsoft Windows applications often depend on files that contain non-executable data, such as
Extensible Application Markup Language (XAML), images, video, and audio. Windows
Presentation Foundation (WPF) offers special support for configuring, identifying, and using
these types of data files, which are called application data files. This support revolves around a
specific set of application data file types, including:

14 LOVELY PROFESSIONAL UNIVERSITY