The content of an item is used in general
when the end-user double-clicks on an item. If the item’s type (or extension)
is known to the system and associated to an application, the content is
requested by ShellBoost to the ShellItem instance using the GetContent()
method. The method signature is defined like this:
public virtual ShellContent GetContent()
The ShellContent is a
stream-oriented abstract class that provides enough information for the
ShellBoost components to provide the content to whatever Windows component
that’s requesting it. ShellBoost also provides two non-abstract classes to make
uses a physical file as the content.
MemoryShellContent: uses memory as the content. Memory can be represented by a string,
an array of bytes, or a seekable and readable Stream.
Note: if the ShellItem instance represents
a physical file item, the default implementation of GetContent() will
return an instance of the FileShellContent, initialized with the corresponding
physical file, so the method does not need to be overridden in that case.