VC++基于JPG标准的图像压缩算法+代码+论文 第19页
Figure 3.13 Docked Help Windows
Task List Explorer
The Task List (see Figure 3.14) enables you to add tasks that need to be done and
organize them in a number of different ways and with priority. It is very simple
to use. If you are using Source Safe, a group of developers can quickly see what
needs to be done and what has been done by viewing the Task List for each file
in the project.
Figure 3.14 Task List
Another feature of the Task List is that it will create tasks on the fly as you
debug your application by marking down any errors. You can then go back and
fix each task and have it removed. You can organize the task list on Build errors.
Also you can create your own custom token, which is a unique key that tells the
Task List that a comment needs to be added to the list, to appear in your Task
List from your code.
Features of VS.NET
VS.NET has a combination of new and old features built into the IDE. We discuss
the additions to IntelliSense, the new features of XML support, and the many different
ways you can now customize the IDE. Let’s begin with IntelliSense.
IntelliSense
IntelliSense is a form of code completion that has been part of most Microsoft
developer tools for many years now. Code completion technology assists when you
start to type a tag, attribute, or property by providing the resulting ending so that
you will not have to write out the whole item. You will notice this right away.
VS.NET has IntelliSense support for all of the primary programming languages:
VB.NET, C#, and C++. IntelliSense even exists for Cascading Style
Sheets and HTML. Unfortunately,VS.NET doesn’t include IntelliSense for XSLT
in the Beta2 version—we may have to wait for the release version. Currently
Active State does make an XSLT plug-in for VS.NET that provides this functionality;
you can obtain a free trial version at
http://aspn.activestate.com/ASPN/Downloads/Visual XSLT.
While developing, you will notice that IntelliSense provides information
about active classes only, meaning those that you have created in your project or
those referenced in your page with the using Directive (for code-behind pages:
page name.aspx.cs). If you are trying to use an object or method, and no
IntelliSense appears for it, you may have forgotten to include the reference.
For example, if you attempt to do data operations using the SqlCommand
object, no IntelliSense will appear until you reference the appropriate data class
(see Figure 3.15):
using System.Data.SqlClient;
Figure 3.15 Using IntelliSense
For C#, IntelliSense is available only in the code-behind page and not in the
ASPX page itself. This may change in the release version. To disable IntelliSense,
choose Tools | Options | Text/Editor and select the editor you are using,
which should be C#. In the Statement Completion section, uncheck all the
options, which will disable IntelliSense for the editor.
XML Editor
When working with XML,VS.NET has some interesting features. If you create a
well-formed XML document of your own, you can easily generate a corresponding
XSD schema that conforms to the 2001 W3C XML schema. Once this
is done, your XML document will have code completion based on this new
schema.To test creating a schema, let’s open poll.xml and generate a schema for it:
_ Choose File | Open. Navigate to your CD-ROM drive and locate the
file poll.xml.
_ Click Open.This should load the page into the IDE.
_ If the XML is one continuous line, simply click the Format the Whole
Document icon (see Figure 3.16).
Figure 3.16 Formatting an XML Document
Now, let’s create a schema for this file. Right-click anywhere in the text editor
and select Create Schema.You can see these resulting changes in Figure 3.17:
_ A new file called poll.xsd was auto-generated by VS.NET.
_ In the Properties window, the new schema is set as the file’s target
schema.
_ An XML namespace attribute is added.
_ IntelliSense based on the schema is now available for this document.
You can also select a different schema to base the XML file on by selecting a
new schema from the targetSchema drop-down (see Figure 3.18).This would then
provide IntelliSense based on the schema selected.
You can also view XML documents from the Data mode.This presents the
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