C# code snippets

Artikkeli
04/09/2024

In Visual Studio, you can use code snippets to add commonly used code to your C# code files. Code snippets can make writing program code quicker, easier, and more reliable.

Expansion code snippets are added at specified insertion points. Surround-with code snippets are added around selected code, and are available for C# and C++ only. For instructions on how to insert or surround code with code snippets, see Code snippets.

Code snippet reference

Code snippets work much the same way in C# and C++, but the set of default code snippets is different. The following C# code snippets are included in Visual Studio by default:

Name or shortcut	Description	Valid insertion locations
#if	Creates an #if directive and an #endif directive.	Anywhere.
#region	Creates a #region directive and an #endregion directive.	Anywhere.
~	Creates a finalizer (destructor) for the containing class.	Inside a class.
attribute	Creates a declaration for a class that derives from Attribute.	Inside a namespace (including the global namespace), a class, or a struct.
checked	Creates a checked block.	Inside a method, an indexer, a property accessor, or an event accessor.
class	Creates a class declaration.	Inside a namespace (including the global namespace), a class, or a struct.
ctor	Creates a constructor for the containing class.	Inside a class.
cw	Creates a call to WriteLine.	Inside a method, an indexer, a property accessor, or an event accessor.
do	Creates a do while loop.	Inside a method, an indexer, a property accessor, or an event accessor.
else	Creates an if-else block.	Inside a method, an indexer, a property accessor, or an event accessor.
enum	Creates an enum declaration.	Inside a namespace (including the global namespace), a class, or a struct.
equals	Creates a method declaration that overrides the Equals method defined in the Object class.	Inside a class or a struct.
exception	Creates a declaration for a class that derives from an exception (Exception by default).	Inside a namespace (including the global namespace), a class, or a struct.
for	Creates a for loop.	Inside a method, an indexer, a property accessor, or an event accessor.
foreach	Creates a foreach loop.	Inside a method, an indexer, a property accessor, or an event accessor.
forr	Creates a for loop that decrements the loop variable after each iteration.	Inside a method, an indexer, a property accessor, or an event accessor.
if	Creates an if block.	Inside a method, an indexer, a property accessor, or an event accessor.
indexer	Creates an indexer declaration.	Inside a class or a struct.
interface	Creates an interface declaration.	Inside a namespace (including the global namespace), a class, or a struct.
invoke	Creates a block that safely invokes an event.	Inside a method, an indexer, a property accessor, or an event accessor.
iterator	Creates an iterator.	Inside a class or a struct.
iterindex	Creates a `named` iterator and indexer pair by using a nested class.	Inside a class or a struct.
lock	Creates a lock block.	Inside a method, an indexer, a property accessor, or an event accessor.
mbox	Creates a call to System.Windows.Forms.MessageBox.Show. You might have to add a reference to System.Windows.Forms.dll.	Inside a method, an indexer, a property accessor, or an event accessor.
namespace	Creates a namespace declaration.	Inside a namespace, including the global namespace.
prop	Creates an autoimplemented property declaration.	Inside a class or a struct.
propfull	Creates a property declaration with `get` and `set` accessors.	Inside a class or a struct.
propg	Creates a read-only autoimplemented property with a private `set` accessor.	Inside a class or a struct.
sim	Creates a static int Main method declaration.	Inside a class or a struct.
struct	Creates a struct declaration.	Inside a namespace (including the global namespace), a class, or a struct.
svm	Creates a static void Main method declaration.	Inside a class or a struct.
switch	Creates a switch block.	Inside a method, an indexer, a property accessor, or an event accessor.
try	Creates a try-catch block.	Inside a method, an indexer, a property accessor, or an event accessor.
tryf	Creates a try-finally block.	Inside a method, an indexer, a property accessor, or an event accessor.
unchecked	Creates an unchecked block.	Inside a method, an indexer, a property accessor, or an event accessor.
unsafe	Creates an unsafe block.	Inside a method, an indexer, a property accessor, or an event accessor.
using	Creates a using directive.	Inside a namespace, including the global namespace.
while	Creates a while loop.	Inside a method, an indexer, a property accessor, or an event accessor.

C# code snippet functions

Functions are specified in the Function element of the code snippet. The following table describes the three functions available to use with the Function element in C# code snippets.

Function	Description
`GenerateSwitchCases(EnumerationLiteral)`	Generates a switch statement and a set of case statements for the members of the enumeration specified by the `EnumerationLiteral` parameter. The `EnumerationLiteral` parameter must be a reference either to an enumeration literal or an enumeration type.
`ClassName()`	Returns the name of the class that contains the inserted snippet.
`SimpleTypeName(TypeName)`	Reduces the `TypeName` parameter to its simplest form in the context in which the snippet was invoked.

GenerateSwitchCases example

The following example shows how to use the GenerateSwitchCases function. When you insert this snippet and enter an enumeration into the $switch_on$ literal, the $cases$ literal generates a case statement for every value in the enumeration.

<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
    <CodeSnippet Format="1.0.0">
        <Header>
            <Title>switch</Title>
            <Shortcut>switch</Shortcut>
            <Description>Code snippet for switch statement</Description>
            <Author>Microsoft Corporation</Author>
            <SnippetTypes>
                <SnippetType>Expansion</SnippetType>
            </SnippetTypes>
        </Header>
        <Snippet>
            <Declarations>
                <Literal>
                    <ID>expression</ID>
                    <ToolTip>Expression to switch on</ToolTip>
                    <Default>switch_on</Default>
                </Literal>
                <Literal Editable="false">
                    <ID>cases</ID>
                    <Function>GenerateSwitchCases($expression$)</Function>
                    <Default>default:</Default>
                </Literal>
            </Declarations>
            <Code Language="csharp">
                <![CDATA[
                    switch ($expression$)
                    {
                        $cases$
                    }
                ]]>
            </Code>
        </Snippet>
    </CodeSnippet>
</CodeSnippets>

ClassName example

The following example shows how to use the ClassName function. When you insert this snippet, the $classname$ literal is replaced with the name of the enclosing class at that location in the code file.

<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
    <CodeSnippet Format="1.0.0">
        <Header>
            <Title>Common constructor pattern</Title>
            <Shortcut>ctor</Shortcut>
            <Description>Code Snippet for a constructor</Description>
            <Author>Microsoft Corporation</Author>
            <SnippetTypes>
                <SnippetType>Expansion</SnippetType>
            </SnippetTypes>
        </Header>
        <Snippet>
            <Declarations>
                <Literal>
                    <ID>type</ID>
                    <Default>int</Default>
                </Literal>
                <Literal>
                    <ID>name</ID>
                    <Default>field</Default>
                </Literal>
                <Literal default="true" Editable="false">
                    <ID>classname</ID>
                    <ToolTip>Class name</ToolTip>
                    <Function>ClassName()</Function>
                    <Default>ClassNamePlaceholder</Default>
                </Literal>
            </Declarations>
            <Code Language="csharp" Format="CData">
                <![CDATA[
                    public $classname$ ($type$ $name$)
                    {
                        this._$name$ = $name$;
                    }
                    private $type$ _$name$;
                ]]>
            </Code>
        </Snippet>
    </CodeSnippet>
</CodeSnippets>

SimpleTypeName example

This example shows how to use the SimpleTypeName function. When you insert this snippet into a code file, the $SystemConsole$ literal is replaced with the simplest form of the Console type in the context in which you invoked the snippet.

<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
    <CodeSnippet Format="1.0.0">
        <Header>
            <Title>Console_WriteLine</Title>
            <Shortcut>cw</Shortcut>
            <Description>Code snippet for Console.WriteLine</Description>
            <Author>Microsoft Corporation</Author>
            <SnippetTypes>
                <SnippetType>Expansion</SnippetType>
            </SnippetTypes>
        </Header>
        <Snippet>
            <Declarations>
                <Literal Editable="false">
                    <ID>SystemConsole</ID>
                    <Function>SimpleTypeName(global::System.Console)</Function>
                </Literal>
            </Declarations>
            <Code Language="csharp">
                <![CDATA[
                    $SystemConsole$.WriteLine();
                ]]>
            </Code>
        </Snippet>
    </CodeSnippet>
</CodeSnippets>

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C# code snippets

Code snippet reference

C# code snippet functions

GenerateSwitchCases example

ClassName example

SimpleTypeName example

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Jaa

C# code snippets

Code snippet reference

C# code snippet functions

GenerateSwitchCases example

ClassName example

SimpleTypeName example

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