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When you call any of these methods, internally, they must scan the managed module s metadata, performing string comparisons to locate the specified custom attribute class Obviously, these operations take time If you re performance conscious, you should consider caching the result of calling these methods rather than calling them repeatedly asking for the same information The SystemReflection namespace defines several classes that allow you to examine the contents of a module s metadata: Assembly, Module, ParameterInfo, MemberInfo, Type, MethodInfo, ConstructorInfo, FieldInfo, EventInfo, PropertyInfo, and their respective *Builder classes All of these classes also offer IsDefined and GetCustomAttributes methods Only SystemAttribute offers the very convenient GetCustomAttribute method The version of GetCustomAttributes defined by the reflection classes returns an array of Object instances (Object[]) instead of an array of Attribute instances (Attribute[]) This is because the reflection classes are able to return objects of non CLS-compliant attribute classes .

In this chapter, I ll describe how to properly implement the operations that all objects must exhibit. Specifically, I ll talk about object equality, identity, hash codes, and cloning.

You shouldn t be concerned about this inconsistency because non CLS-compliant attributes are incredibly rare In fact, in all of the time I ve been working with the NET Framework, I ve never even seen one Note Be aware that only Attribute, Type, and MethodInfo classes implement reflection.

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At the root of the I/O hierarchy is QIODevice. QIODevice defines familiar methods for managing a bidirectional stream of data, including: open, which prepares the device for reading and writing data. close, which terminates the device s interface for reading and writing and may release the system context (such as a file handle) associated with the instance. read, which reads up to the indicated number of bytes and returns them as an array of bytes. readAll, which reads the remainder of the available data and returns the data as an array of bytes. write, which lets you write an array of bytes to the device.

methods that honor the Boolean inherit parameter . All other reflection methods that look up attributes ignore the inherit parameter and do not check the inheritance hierarchy . If you need to check the presence of an inherited attribute for events, properties, fields, constructors, or parameters, you must call one of Attribute s methods .

The System.Object type offers a virtual method, named Equals, whose purpose is to return true if two objects have the same "value". The .NET Framework Class Library (FCL) includes many methods, such as System.Array s IndexOf method and System.Collections.ArrayList s Contains method, that internally call Equals. Because Equals is defined by Object and because every type is ultimately derived from Object, every instance of every type offers the Equals method. For types that don t explicitly override Equals, the implementation provided by Object (or the nearest base class that overrides Equals) is inherited. The following code shows how System.Object s Equals method is essentially implemented:

There s one more thing you should be aware of: When you pass a class to IsDefined, GetCustomAttribute, or GetCustomAttributes, these methods search for the application of the attribute class you specify or any attribute class derived from the specified class . If your code is looking for a specific attribute class, you should perform an additional check on the returned value to ensure that what these methods returned is the exact class you re looking

for . You might also want to consider defining your attribute class to be sealed to reduce potential confusion and eliminate this extra check . Here s some sample code that lists all of the methods defined within a type and displays the attributes applied to each method . The code is for demonstration purposes; normally, you wouldn t apply these particular custom attributes to these targets as I ve done here .

class Object { public virtual Boolean Equals(Object obj) { // If both references point to the same // object, they must be equal. if (this == obj) return(true); // Assume that the objects are not equal. return(false); } }

using System; using System.Diagnostics; using System.Reflection;

[assembly: CLSCompliant(true)]

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