c# 2d data matrix ATTRIBUTES in C#.NET

Maker DataMatrix in C#.NET ATTRIBUTES

CHAPTER 21 ATTRIBUTES
Encoding Data Matrix In Visual C#
Using Barcode drawer for Visual Studio .NET Control to generate, create Data Matrix image in Visual Studio .NET applications.
www.OnBarcode.com
Reading Data Matrix ECC200 In Visual C#
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Using the GetCustomAttributes Method
UPC-A Supplement 2 Encoder In Visual C#
Using Barcode creation for VS .NET Control to generate, create UPC A image in .NET applications.
www.OnBarcode.com
Code 128C Creator In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Code 128 image in .NET framework applications.
www.OnBarcode.com
The GetCustomAttributes method returns an array of the attributes applied to a construct. The actual object returned is an array of objects, which you must then cast to the correct attribute type. The Boolean parameter specifies whether to search the inheritance tree to find the attribute. object[] AttArr = t.GetCustomAttributes(false); When the GetCustomAttributes method is called, an instance of each attribute associated with the target is created. The following code uses the same attribute and class declarations as the previous example. But in this case, it doesn t just determine whether an attribute is applied to the class. Instead, it retrieves an array of the attributes applied to the class and cycles through them, printing out their member values. static void Main( ) { MyClass mc = new MyClass(); Type t = mc.GetType(); object[] AttArr = t.GetCustomAttributes(false); foreach (Attribute a in AttArr) { MyAttributeAttribute attr = a as MyAttributeAttribute; if (null != attr) { Console.WriteLine("Description : {0}", attr.Description); Console.WriteLine("Version Number : {0}", attr.VersionNumber); Console.WriteLine("Reviewer ID : {0}", attr.ReviewerID); } } }
Draw DataMatrix In Visual C#.NET
Using Barcode encoder for VS .NET Control to generate, create Data Matrix ECC200 image in .NET framework applications.
www.OnBarcode.com
Barcode Printer In Visual C#.NET
Using Barcode generation for VS .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
CHAPTER 21 ATTRIBUTES
Generating Linear 1D Barcode In Visual C#
Using Barcode creation for .NET Control to generate, create 1D image in VS .NET applications.
www.OnBarcode.com
Code11 Generation In Visual C#
Using Barcode drawer for Visual Studio .NET Control to generate, create Code11 image in Visual Studio .NET applications.
www.OnBarcode.com
Using Reserved Attributes
ECC200 Creator In VS .NET
Using Barcode creator for VS .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
www.OnBarcode.com
Print Data Matrix In None
Using Barcode drawer for Software Control to generate, create ECC200 image in Software applications.
www.OnBarcode.com
There are several attributes reserved by .NET that are designed to be processed by the compiler. You ve already seen AttributeUsage, but there are two others you should know about the Obsolete and Conditional attributes.
PDF417 Creator In Java
Using Barcode generation for BIRT Control to generate, create PDF-417 2d barcode image in Eclipse BIRT applications.
www.OnBarcode.com
Decode Barcode In Visual Studio .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
The Obsolete Attribute
Paint PDF417 In .NET
Using Barcode maker for ASP.NET Control to generate, create PDF 417 image in ASP.NET applications.
www.OnBarcode.com
Data Matrix 2d Barcode Reader In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
You saw the Obsolete attribute in the first example in this chapter. It allows you to mark a program construct as obsolete and to display a helpful warning message when the code is compiled. There is another overload of the constructor for Obsolete that takes a second parameter, of type bool. This parameter specifies whether use of the target should be flagged as an error or as a warning. The following code specifies that it should be flagged as an error. Flag as an error. [ Obsolete("Use method SuperPrintOut", true) ] // Apply attribute to method. static void PrintOut(string str) { ...
Barcode Generation In Objective-C
Using Barcode maker for iPad Control to generate, create Barcode image in iPad applications.
www.OnBarcode.com
UPC Code Maker In Visual Studio .NET
Using Barcode generation for Reporting Service Control to generate, create UPC Symbol image in Reporting Service applications.
www.OnBarcode.com
The Conditional Attribute
Painting QR Code In VB.NET
Using Barcode creator for .NET framework Control to generate, create QR-Code image in Visual Studio .NET applications.
www.OnBarcode.com
UCC-128 Maker In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create USS-128 image in ASP.NET applications.
www.OnBarcode.com
The Conditional attribute allows you to either include or exclude all the invocations of a particular method. To use the Conditional attribute, apply it to the method declaration, along with a compilation symbol as a parameter. If the compilation symbol is defined, the compiler will include the code for all the invocations of the method, the way it would for any normal method. If the compilation symbol is not defined, the compiler will omit all the method invocations, throughout the code. The CIL code for the method itself is always included in the assembly. It is just the invocations that are included or omitted. For example, in the following code, the Conditional attribute is applied to the declaration of a method called TraceMessage. The attribute has a single parameter, which is the string DoTrace. When the compiler is compiling the code, it will check whether there is a compilation symbol named DoTrace defined. If DoTrace is defined, the compiler will include all the calls to method TraceMessage, as usual. If there is no DoTrace compilation symbol defined, it will not output code for any of the calls to TraceMessage.
Data Matrix ECC200 Maker In Java
Using Barcode drawer for Java Control to generate, create DataMatrix image in Java applications.
www.OnBarcode.com
DataMatrix Creator In Visual Studio .NET
Using Barcode generator for .NET Control to generate, create Data Matrix image in VS .NET applications.
www.OnBarcode.com
CHAPTER 21 ATTRIBUTES
Compilation symbol [Conditional( "DoTrace" )] static void TraceMessage(string str) { Console.WriteLine(str); }
Example of Conditional Attribute
The following code shows a full example using of the Conditional attribute. Method Main contains two calls to method TraceMessage. The declaration for method TraceMessage is adorned with the Conditional attribute, which has the compilation symbol DoTrace as its parameter. So if DoTrace is defined, the compiler will include the code for all the calls to TraceMessage. Since the first line of code defines a compilation symbol named DoTrace, the compiler will include the code for both calls to TraceMessage. #define DoTrace using System; using System.Diagnostics; namespace AttributesConditional { class Program { [Conditional( "DoTrace" )] static void TraceMessage(string str) { Console.WriteLine(str); } static void Main(string[] args) { TraceMessage("Start of Main"); Console.WriteLine("Doing work in Main."); TraceMessage("End of Main"); } } }
Copyright © OnBarcode.com . All rights reserved.