barcode printing using c#.net PART I PART I PART I in Visual C#.NET

Creation QR in Visual C#.NET PART I PART I PART I

PART I PART I PART I
Generate QR Code In C#
Using Barcode generator for .NET framework Control to generate, create QR Code image in VS .NET applications.
Recognize QR In C#
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
Here, Denom is a normal instance variable that cannot be accessed within a static method However, the use of Val is okay since it is a static variable The same problem occurs when trying to call a non-static method from within a static method of the same class For example:
Create Bar Code In C#
Using Barcode generation for Visual Studio .NET Control to generate, create bar code image in Visual Studio .NET applications.
Recognize Barcode In Visual C#.NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in VS .NET applications.
using System; class AnotherStaticError { // A non-static method void NonStaticMeth() { ConsoleWriteLine("Inside NonStaticMeth()"); } /* Error! Can't directly call a non-static method from within a static method */ static void staticMeth() { NonStaticMeth(); // won't compile } }
QR-Code Generation In .NET Framework
Using Barcode generator for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
Drawing QR Code 2d Barcode In .NET
Using Barcode generator for .NET Control to generate, create QR Code image in Visual Studio .NET applications.
In this case, the attempt to call a non-static (that is, instance method) from a static method causes a compile-time error It is important to understand that a static method can call instance methods and access instance variables of its class if it does so through an object of that class It is just that it cannot use an instance variable or method without an object qualification For example, this fragment is perfectly valid:
Printing QR Code In Visual Basic .NET
Using Barcode encoder for .NET Control to generate, create QR Code image in VS .NET applications.
Draw Code 128B In C#
Using Barcode drawer for Visual Studio .NET Control to generate, create Code 128C image in VS .NET applications.
class MyClass { // A non-static method void NonStaticMeth() { ConsoleWriteLine("Inside NonStaticMeth()"); } /* Can call a non-static method through an object reference from within a static method */
Linear Barcode Encoder In C#.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create 1D Barcode image in VS .NET applications.
Make Data Matrix 2d Barcode In C#
Using Barcode maker for .NET framework Control to generate, create Data Matrix 2d barcode image in Visual Studio .NET applications.
Part I:
Paint GS1-128 In C#
Using Barcode generation for Visual Studio .NET Control to generate, create GS1 128 image in .NET applications.
Creating USD8 In Visual C#.NET
Using Barcode encoder for .NET framework Control to generate, create Code 11 image in .NET applications.
The C# Language
GS1 - 12 Creation In Objective-C
Using Barcode generation for iPhone Control to generate, create UPC-A Supplement 5 image in iPhone applications.
Barcode Generation In .NET
Using Barcode generator for ASP.NET Control to generate, create barcode image in ASP.NET applications.
public static void staticMeth(MyClass ob) { obNonStaticMeth(); // this is OK } }
Code 3 Of 9 Printer In Java
Using Barcode creator for Java Control to generate, create Code-39 image in Java applications.
Generate UPCA In Java
Using Barcode printer for Eclipse BIRT Control to generate, create UPC Symbol image in Eclipse BIRT applications.
Here, NonStaticMeth( ) is called by staticMeth( ) through ob, which is an object of type MyClass Because static fields are independent of any specific object, they are useful when you need to maintain information that is applicable to an entire class Here is an example of such a situation It uses a static field to maintain a count of the number of objects that are in existence
Data Matrix ECC200 Decoder In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Making Bar Code In Visual Studio .NET
Using Barcode generator for Reporting Service Control to generate, create barcode image in Reporting Service applications.
// Use a static field to count instances using System; class CountInst { static int count = 0; // Increment count when object is created public CountInst() { count++; } // Decrement count when object is destroyed ~CountInst() { count--; } public static int GetCount() { return count; } } class CountDemo { static void Main() { CountInst ob;
Scan Code 39 Extended In .NET Framework
Using Barcode reader for VS .NET Control to read, scan read, scan image in VS .NET applications.
Draw EAN128 In Java
Using Barcode maker for Eclipse BIRT Control to generate, create EAN128 image in BIRT applications.
for(int i=0; i < 10; i++) { ob = new CountInst(); ConsoleWriteLine("Current count: " + CountInstGetCount()); } } }
The output is shown here:
Current Current Current Current Current Current count: count: count: count: count: count: 1 2 3 4 5 6
8:
A Closer Look at Methods and Classes
Current Current Current Current
count: count: count: count:
7 8 9 10
PART I PART I PART I
Each time that an object of type CountInst is created, the static field count is incremented Each time an object is recycled, count is decremented Thus, count always contains a count of the number of objects currently in existence This is possible only through the use of a static field There is no way for an instance variable to maintain the count because the count relates to the class as a whole, not to a specific instance Here is one more example that uses static Earlier in this chapter, you saw how a class factory could be used to create objects In that example, the class factory was a non-static method, which meant that it could be called only through an object reference This meant that a default object of the class needed to be created so that the factory method could be called However, a better way to implement a class factory is as a static method, which allows the class factory to be called without creating an unnecessary object Here is the class factory example rewritten to reflect this improvement:
// Use a static class factory using System; class MyClass { int a, b; // Create a class factory for MyClass static public MyClass Factory(int i, int j) { MyClass t = new MyClass(); ta = i; tb = j; return t; // return an object } public void Show() { ConsoleWriteLine("a and b: " + a + " " + b); } } class MakeObjects { static void Main() { int i, j; // Generate objects using the factory for(i=0, j=10; i < 10; i++, j--) { MyClass ob = MyClassFactory(i, j); // get an object obShow(); } ConsoleWriteLine(); } }
Part I:
Copyright © OnBarcode.com . All rights reserved.