Represents an argument of a custom attribute in the reflection-only context, or an element of an array argument.
Assembly: mscorlib (in mscorlib.dll)
Thetype exposes the following members.
|Equals||Indicates whether this instance and a specified object are equal. (Inherited from ValueType.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Returns the hash code for this instance. (Inherited from ValueType.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|ToString||Returns the fully qualified type name of this instance. (Inherited from ValueType.)|
Code that is being examined in the reflection-only context cannot be executed, so it is not always possible to examine custom attributes by creating instances of them and then examining their properties, using methods like Attribute.GetCustomAttributes, MemberInfo.GetCustomAttributes, and so on. If the code for the attribute type itself is loaded into the reflection-only context, it cannot be executed.
The CustomAttributeNamedArgument structure is used by the CustomAttributeData class to provide access to the type and value of a positional argument specified for a custom attribute instance, without executing the attribute constructor. It also provides access to the type and value of a named argument without executing the code of the corresponding property of the custom attribute type.
The types and values of all the positional and named arguments of an attribute instance are provided by structures. The positional attributes returned by the CustomAttributeData.ConstructorArguments property are directly represented by structures, but the named arguments returned by the CustomAttributeData.NamedArguments property are represented by CustomAttributeNamedArgument structures; to get the structure for a named argument, use the CustomAttributeNamedArgument.TypedValue property.
If an argument is an array of values, the Value property of the that represents the argument returns a generic ReadOnlyCollection<T> of objects. Each object in the collection represents the corresponding element of the array.
To create instances of the CustomAttributeData class, use the staticGetCustomAttributes() factory method.
The following example defines a custom attribute with four constructors and four properties. Two of the properties are read-only, and are set by using the positional parameters of the constructors. The other two properties are read/write, and can be set only by using named arguments. One positional property is an array of strings, and one named property is an array of integers.
The attribute is applied to the assembly, to a type declared in the assembly, to a method of the type, and to a parameter of the method. Different constructors are used for these cases. When executed, the assembly loads itself into the reflection-only context and displays the custom attributes.
The attribute that is applied to the type demonstrates array properties, with both positional and named arguments.