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If later you decide you don t want a given template to appear in the VS New Item window, remove the item template from the global item templates folder(s) and run the preceding command again This section showed you how to add new project and item templates to VS, but sometimes you just want to add a common bit of code while you re programming The next section shows you how to add your own custom code snippets to VS
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If you ve been using VS snippets, as described in 2, you ll know how much time they can save when writing common blocks of code In time, you ll wonder why certain items aren t already covered by snippets, especially if you re a C# developer who has noticed that VB has many more snippets Even if you re a VB developer with the plethora of available snippets, you might find blocks of code that will make you more productive when written in the form of a snippet This chapter takes you to the next level in working with snippets by showing you how to create and manage your own snippets
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VB already has a snippet for Sub and Function, but C# doesn t Since C# doesn t have as many snippets as VB, I ll show you how to create a snippet in C#, but the process is similar for a VB snippet To create a new snippet, you can either work from an existing snippet file or start from scratch I ll show you how to find and open existing snippets first
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Snippets that ship with VS are located at \Program Files\Microsoft Visual Studio 100 under a folder for the language (VC#, VB, XML, and more) you need to find a snippet for There, you ll either find one or more folders named with language codes (English is 1033) or a folder named Snippets For some languages, the language code is at a higher level and the Snippets folder is under that or vice versa; regardless, you ll be looking for the Snippets folder that contains items with a snippet file extension The file path for C# is \Program Files\Microsoft Visual Studio 100\VC#\Snippets\1033 Beneath the Snippets folder, you ll see additional folders that serve to categorize other snippets We re going to open the for snippet because it contains several features that give you a good idea of how snippets work It might help if you open a blank file by pressing CTRL-N, selecting Visual C# Class, and naming the file anything you want, and try the for snippet before going further; it will give you a good idea of what the snippet is supposed to be doing Alternatively, you can review the description of the for snippet in 2 The snippet extension is registered with VS, so you can double-click the forsnippet file in the Snippets folder and it will open in VS Listing 12-1 shows what this file looks like
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Listing 12-1 Inside the for snippet
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< xml version="10" encoding="utf-8" > <CodeSnippets xmlns= "http://schemasmicrosoftcom/VisualStudio/2005/CodeSnippet"> <CodeSnippet Format="100"> <Header> <Title>for</Title> <Shortcut>for</Shortcut> <Description>Code snippet for 'for' loop</Description> <Author>Microsoft Corporation</Author> <SnippetTypes> <SnippetType>Expansion</SnippetType> <SnippetType>SurroundsWith</SnippetType> </SnippetTypes> </Header> <Snippet> <Declarations> <Literal> <ID>index</ID> <Default>i</Default> <ToolTip>Index</ToolTip> </Literal>
12: Customizing the Development Environment
<Literal> <ID>max</ID> <Default>length</Default> <ToolTip>Max length</ToolTip> </Literal> </Declarations> <Code Language="csharp"><![CDATA[for (int $index$ = 0; $index$ < $max$; $index$++) { $selected$ $end$ }]]> </Code> </Snippet> </CodeSnippet> </CodeSnippets>
As shown in Listing 12-1, a snippet is an XML file where all data is defined by begin and end tags arranged in a hierarchy Inside of the CodeSnippet tags are Header and Snippet elements Inside of the Header element is a Shortcut element that defines the prefix you must type in the VS editor to use the snippet The Title and Description tags define what displays for Intellisense in VS when the shortcut is being typed Author tells who wrote the snippet The SnippetTypes element defines the two ways to use a snippet: Expansion and SurroundsWith 2 describes many snippets that work via Expansion However, SurroundsWith snippets are also very useful To use a SurroundsWith snippet, highlight the code that you want to surround, press CTRL-SPACE, and select the snippet After selecting the snippet, the snippet template will appear in VS, with its blocks surrounding the highlighted text Since the for loop has a block that can contain statements, it makes sense that the for snippet is both a SurroundsWith and Expansion snippet The Snippet element in Listing 12-1 contains a Declarations and Code element, where the declarations are used in the code Thinking about how snippet templates work, remember that your cursor is positioned on blocks of code that you change and tab through to complete the snippet The blocks of code to be filled in correspond to Literal elements in the declaration Each Literal element has an ID that is used in the Code to define where the Literal is located Default describes the data shown in the template before you start typing Whenever you re filling in a snippet template, you can hover over the data field and a tooltip will describe what information should go into the data field This tooltip is defined in the Tooltip element of the snippet definition The ID of each literal is defined in the Code element Inside the Code element is the code for the snippet The variables in the code with $ prefix and suffix help define how the snippet template works Notice that $index$ and $max$ match Literal elements in the Declarations element; this is where you must
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