free qr code library vb.net CustomAttributeData s GetCustomAttributes method acts as a factory . That is, when in .NET

Creation QR Code 2d barcode in .NET CustomAttributeData s GetCustomAttributes method acts as a factory . That is, when

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you call it, it returns a collection of CustomAttributeData objects in an object of type IList<CustomAttributeData> . The collection contains one element per custom attribute applied to the specified target . For each CustomAttributeData object, you can query some read-only properties to determine how the attribute object would be constructed and initialized . Specifically, the Constructor property indicates which constructor method would be called, the ConstructorArguments property returns the arguments that would be passed to this constructor as an instance of IList<CustomAttributeTypedArgument>, and the NamedArguments property returns the fields/properties that would be set as an instance of IList<CustomAttributeNamedArgument> . Notice that I say would be in the previous sentences because the constructor and set accessor methods will not actually be called we get the added security by preventing any attribute class methods from executing . Here s a modified version of a previous code sample that uses the CustomAttributeData class to securely obtain the attributes applied to various targets:
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using using using using System; System.Diagnostics; System.Reflection; System.Collections.Generic;
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[assembly: CLSCompliant(true)]
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[Serializable] [DefaultMemberAttribute("Main")] [DebuggerDisplayAttribute("Richter", Name="Jeff", Target=typeof(Program))] public sealed class Program { [Conditional("Debug")] [Conditional("Release")] public void DoSomething() { } public Program() { } [CLSCompliant(true)] [STAThread] public static void Main() { // Show the set of attributes applied to this type ShowAttributes(typeof(Program));
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18 Custom Attributes
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// Get the set of methods associated with the type MemberInfo[] members = typeof(Program).FindMembers( MemberTypes.Constructor | MemberTypes.Method, BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public | BindingFlags.Static, Type.FilterName, "*"); foreach (MemberInfo member in members) { // Show the set of attributes applied to this member ShowAttributes(member); } } private static void ShowAttributes(MemberInfo attributeTarget) { IList<CustomAttributeData> attributes = CustomAttributeData.GetCustomAttributes(attributeTarget); Console.WriteLine("Attributes applied to {0}: {1}", attributeTarget.Name, (attributes.Count == 0 "None" : String.Empty)); foreach (CustomAttributeData attribute in attributes) { // Display the type of each applied attribute Type t = attribute.Constructor.DeclaringType; Console.WriteLine(" {0}", t.ToString()); Console.WriteLine(" Constructor called={0}", attribute.Constructor); IList<CustomAttributeTypedArgument> posArgs = attribute.ConstructorArguments; Console.WriteLine(" Positional arguments passed to constructor:" + ((posArgs.Count == 0) " None" : String.Empty)); foreach (CustomAttributeTypedArgument pa in posArgs) { Console.WriteLine(" Type={0}, Value={1}", pa.ArgumentType, pa.Value); }
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IList<CustomAttributeNamedArgument> namedArgs = attribute.NamedArguments; Console.WriteLine(" Named arguments set after construction:" + ((namedArgs.Count == 0) " None" : String.Empty)); foreach(CustomAttributeNamedArgument na in namedArgs) { Console.WriteLine(" Name={0}, Type={1}, Value={2}", na.MemberInfo.Name, na.TypedValue.ArgumentType, na.TypedValue.Value); } Console.WriteLine(); } Console.WriteLine(); } }
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Building and running this application yields the following output:
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Attributes applied to Program: System.SerializableAttribute Constructor called=Void .ctor() Positional arguments passed to constructor: None
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Part III Essential Types
Named arguments set after construction: None System.Diagnostics.DebuggerDisplayAttribute Constructor called=Void .ctor(System.String) Positional arguments passed to constructor: Type=System.String, Value=Richter Named arguments set after construction: Name=Name, Type=System.String, Value=Jeff Name=Target, Type=System.Type, Value=Program System.Reflection.DefaultMemberAttribute Constructor called=Void .ctor(System.String) Positional arguments passed to constructor: Type=System.String, Value=Main Named arguments set after construction: None
Attributes applied to DoSomething: System.Diagnostics.ConditionalAttribute Constructor called=Void .ctor(System.String) Positional arguments passed to constructor: Type=System.String, Value=Release Named arguments set after construction: None System.Diagnostics.ConditionalAttribute Constructor called=Void .ctor(System.String) Positional arguments passed to constructor: Type=System.String, Value=Debug Named arguments set after construction: None
Attributes applied to Main: System.CLSCompliantAttribute Constructor called=Void .ctor(Boolean) Positional arguments passed to constructor: Type=System.Boolean, Value=True Named arguments set after construction: None System.STAThreadAttribute Constructor called=Void .ctor() Positional arguments passed to constructor: None Named arguments set after construction: None
Attributes applied to .ctor: None
Conditional Attribute Classes
Over time, the ease of defining, applying, and reflecting over attributes has caused developers to use them more and more . Using attributes is also a very easy way to annotate your code while simultaneously implementing rich features . Lately, developers have been using attributes to assist them with design time and debugging . For example,
18 Custom Attributes
the Microsoft Visual Studio code analysis tool (FxCopCmd .exe) offers a System.Diagnostics.CodeAnalysis.SuppressMessageAttribute which you can apply to types and members in order to suppress the reporting of a specific static analysis tool rule violation . This attribute is only looked for by the code analysis utility; the attribute is never looked for when the program is running normally . When not using code analysis, having SuppressMessage attributes sitting in the metadata just bloats the metadata, which makes your file bigger, increases your process s working set, and hurts your application s performance . It would be great if there were an easy way to have the compiler emit the SuppressMessage attributes only when you intend to use the code analysis tool . Fortunately, there is a way to do this by using conditional attribute classes . An attribute class that has the System.Diagnostics.ConditionalAttribute applied to it is called a conditional attribute class . Here is an example:
//#define TEST #define VERIFY using System; using System.Diagnostics;
[Conditional("TEST")][Conditional("VERIFY")] public sealed class CondAttribute : Attribute { } [Cond] public sealed class Program { public static void Main() { Console.WriteLine("CondAttribute is {0}applied to Program type.", Attribute.IsDefined(typeof(Program), typeof(CondAttribute)) "" : "not "); } }
When a compiler sees an instance of the CondAttribute being applied to a target, the compiler will emit the attribute information into the metadata only if the TEST or VERIFY symbol is defined when the code containing the target is compiled . However, the attribute class definition metadata and implementation is still present in the assembly .
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