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REFLECTION AND ATTRIBUTES
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Predefined Attributes
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The .NET Framework predefines a number of attributes that are understood and interpreted by the compiler and the CLR. Table 24-2 lists some of these. The table uses the short names, without the Attribute suffix. For example, the full name of CLSCompliant is CLSCompliantAttribute. Table 24-2. Important Attributes Defined in .NET
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CLSCompliant
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Meaning
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Declares that the publicly exposed members should be checked by the compiler for compliance with the CLS. Compliant assemblies can be used by any .NETcompliant language. Declares that the construct can be serialized. Declares that the construct cannot be serialized. Declares that the construct should not be used. The compiler also produces a compile-time warning or error message, if the construct is used. Declares that the implementation is unmanaged code. Declares that the method should be exposed as part of an XML web service. Declares what types of program constructs the attribute can be applied to. This attribute is applied to attribute declarations.
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Serializable NonSerialized Obsolete
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More About Applying Attributes
The simple attributes shown so far have used a single attribute applied to a method. This section describes other types of attribute usage.
Multiple Attributes
You can apply multiple attributes to a single construct. Multiple attributes can be listed in either of the following formats: Separate attribute sections stacked on top of each other A single attribute section, with the attributes separated by commas
You can list the attributes in any order.
For example, the following two sections of code show the two ways of applying multiple attributes. The sections of code are equivalent. [ Serializable ] [ MyAttribute("Simple class", "Version 3.57") ] [ MyAttribute("Simple class", "Version 3.57"), Serializable ] Attribute Attribute // Stacked // Commas
REFLECTION AND ATTRIBUTES
Other Types of Targets
Besides classes, you can also apply attributes to other program constructs such as fields and properties. The following declaration shows an attribute on a field, and multiple attributes on a method: [MyAttribute("Holds a value", "Version 3.2")] public int MyField; [Obsolete] [MyAttribute("Prints out a message.", "Version 3.6")] public void PrintOut() { ... // On a field // On a method
You can also explicitly label attributes to apply to a particular target construct. To use an explicit target, place the target type, followed by a colon, at the beginning of the attribute section. For example, the following code decorates the method with an attribute and also applies an attribute to the return value. Explicit target [method: MyAttribute("Prints out a message.", "Version 3.6")] [return: MyAttribute("This value represents ...", "Version 2.3")] public long ReturnSetting() { ... The C# language defines ten standard attribute targets, which are listed in Table 24-3. Most of the target names are self-explanatory, but type covers classes, structs, delegates, enums, and interfaces. The typevar target name specifies type parameters to constructs that use generics. Table 24-3. Attribute Targets event method property type assembly field param return typevar module
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Global Attributes
You can also use an explicit target to set attributes at the assembly and module level, by using the assembly and module target names. (Assemblies and modules were explained in 10.) Some important points about assembly-level attributes are the following: Assembly-level attributes must be placed outside any namespace scope and are usually placed in the AssemblyInfo.cs file. The AssembyInfo.cs file usually contains metadata about the company, product, and copyright information. The following are lines from an AssemblyInfo.cs file: [assembly: [assembly: [assembly: [assembly: [assembly: [assembly: [assembly: [assembly: AssemblyTitle("SuperWidget")] AssemblyDescription("Implements the SuperWidget product.")] AssemblyConfiguration("")] AssemblyCompany("McArthur Widgets, Inc.")] AssemblyProduct("Super Widget Deluxe")] AssemblyCopyright("Copyright McArthur Widgets 2010")] AssemblyTrademark("")] AssemblyCulture("")]
REFLECTION AND ATTRIBUTES
Custom Attributes
You ve probably noticed that the syntax for applying an attribute is very different from anything you ve seen so far. From that, you might get the impression that attributes are an entirely different type of construct. They re not they re just a special kind of class. Some important points about attribute classes are the following: User-defined attribute classes are called custom attributes. All attribute classes are derived from class System.Attribute.
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