generate 2d barcode vb.net Part III Essential Types in Visual C#

Making PDF-417 2d barcode in Visual C# Part III Essential Types

Part III Essential Types
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if (d.GetType() == typeof(OneString)) { // Just copy the String argument Array.Copy(args, 2, callbackArgs, 0, callbackArgs.Length); } try { // Invoke the delegate and show the result Object result = d.DynamicInvoke(callbackArgs); Console.WriteLine("Result = " + result); } catch (TargetParameterCountException) { Console.WriteLine("Incorrect number of parameters specified."); } }
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// This callback method takes 2 Int32 arguments private static Object Add(Int32 n1, Int32 n2) { return n1 + n2; } // This callback method takes 2 Int32 arguments private static Object Subtract(Int32 n1, Int32 n2) { return n1 - n2; } // This callback method takes 1 String argument private static Object NumChars(String s1) { return s1.Length; } // This callback method takes 1 String argument private static Object Reverse(String s1) { Char[] chars = s1.ToCharArray(); Array.Reverse(chars); return new String(chars); } }
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In this chapter: Using Custom Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435 Defining Your Own Attribute Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439 Attribute Constructor and Field/Property Data Types . . . . . . . . . . . . . . . . . . . . . 443 Detecting the Use of a Custom Attribute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444 Matching Two Attribute Instances Against Each Other . . . . . . . . . . . . . . . . . . . . 448 Detecting the Use of a Custom Attribute Without Creating Attribute-Derived Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451 Conditional Attribute Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454
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In this chapter, I ll discuss one of the most innovative features the Microsoft .NET Framework has to offer: custom attributes . Custom attributes allow you to declaratively annotate your code constructs, thereby enabling special features . Custom attributes allow information to be defined and applied to almost any metadata table entry . This extensible metadata information can be queried at runtime to dynamically alter the way code executes . As you use the various .NET Framework technologies (Windows Forms, Web Forms, XML Web services, and so on), you ll see that they all take advantage of custom attributes, allowing developers to express their intentions within code very easily . A solid understanding of custom attributes is necessary for any .NET Framework developer .
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Attributes, such as public, private, static, and so on, can be applied to types and members . I think we d all agree on the usefulness of applying attributes, but wouldn t it be even more useful if we could define our own attributes For example, what if I could define a type and somehow indicate that the type can be remoted via serialization Or maybe I could apply an attribute to a method to indicate that certain security permissions must be granted before the method can execute . Of course, creating and applying user-defined attributes to types and methods would be great and convenient, but it would require the compiler to be aware of these attributes so it would emit the attribute information into the resulting metadata . Because compiler vendors usually prefer not to release the source code for their compiler, Microsoft came up with another way to allow user-defined attributes . This mechanism, called custom attributes, is an
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