vb.net qr code generator source code Properties and Methods Common to All MemberInfo-Derived Types in .NET framework

Encode QR Code ISO/IEC18004 in .NET framework Properties and Methods Common to All MemberInfo-Derived Types

Properties and Methods Common to All MemberInfo-Derived Types
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Member Type
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String property
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Member Name
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Returns the name of the member . In the case of a nested type, Name returns the concatenation of the name of the containing type, followed by + , followed by the name of the nested type .
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23 Assembly Loading and Reflection
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Member Name
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MemberType
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Member Type
MemberTypes (enum) property
Description
Returns the kind of member (field, constructor, method, property, event, type (non-nested type or nested type) . Returns the Type that declares the member . Returns the Type used to obtain this member . Returns the Module that declares the member . Returns the metadata token (within the module) that identifies the member . Returns an array in which each element identifies an instance of a custom attribute applied to this member . Custom attributes can be applied to any member . Use this method with assemblies that have not been loaded in the reflection only context . Returns a collection in which each a custom attribute applied to this member . Custom attributes can be applied to any member . Even though Assembly does not derive from MemberInfo, it provides the same method that can be used with assemblies .
DeclaringType ReflectedType Module MetadataToken
Type property Type property Module property Int32 property
GetCustomAttributes
Method returning Object[]
GetCustomAttributesData
Method returning
IList<CustomAttributeData> element identifies an instance of
IsDefined
Method returning Boolean
Returns true if at least one instance of the specified custom attribute is applied to the member .
Most of the properties mentioned in Table 23-1 are self-explanatory . However, developers frequently confuse the DeclaringType and ReflectedType properties . To fully understand these properties, let s define the following type:
public sealed class MyType { public override String ToString() { return null; } }
What would happen if the following line of code executed
MemberInfo[] members = typeof(MyType).GetMembers();
Part IV
Core Facilities
The members variable is a reference to an array in which each element identifies a public member defined by MyType and any of its base types, such as System.Object . If you were to query the DeclaringType property for the MemberInfo element identifying the ToString method, you d see MyType returned because MyType declares a ToString method . On the other hand, if you were to query the DeclaringType property for the MemberInfo element identifying the Equals method, you d see System.Object returned because Equals is declared by System.Object, not by MyType . The ReflectedType property always returns MyType because this was the type specified when GetMembers was called to perform the reflection . Each element of the array returned by calling GetMembers is a reference to one of the concrete types in the hierarchy (unless the BindingFlags.DeclaredOnly flag is specified) . Although Type s GetMembers method returns all of the type s members, Type also offers methods that return specific member types . For example, Type offers GetNestedTypes, GetFields, GetConstructors, GetMethods, GetProperties, and GetEvents . These methods all return arrays in which each element is a reference to a Type object, FieldInfo object, ConstructorInfo object, MethodInfo object, PropertyInfo object, or EventInfo object, respectively . Figure 23-2 summarizes the types used by an application to walk reflection s object model . From an AppDomain, you can discover the assemblies loaded into it . From an assembly, you can discover the modules that make it up . From an assembly or a module, you can discover the types that it defines . From a type, you can discover its nested types, fields, constructors, methods, properties, and events . Namespaces are not part of this hierarchy because they are simply syntactical gatherings of types . If you want to list all of the namespaces defined in an assembly, you need to enumerate all of the types in this assembly and take a look at their Namespace property . From a type, it is also possible to discover the interfaces it implements . (I ll show how to do this a little later .) And from a constructor, method, property accessor method, or event add/remove method, you can call the GetParameters method to obtain an array of ParameterInfo objects, which tells you the types of the member s parameters . You can also query the read-only ReturnParameter property to get a ParameterInfo object for detailed information about a member s return value . For a generic type or method, you can call the GetGenericArguments method to get the set of type parameters . Finally, for any of these items, you can call the GetCustomAttributes method to obtain the set of custom attributes applied to them .
23 Assembly Loading and Reflection FieldInfo #1 FieldInfo #2
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