barcode with vb.net C# 30: A Beginner s Guide in Visual C#.NET

Creator Code-128 in Visual C#.NET C# 30: A Beginner s Guide

C# 30: A Beginner s Guide
Draw Code 128B In Visual C#.NET
Using Barcode generation for Visual Studio .NET Control to generate, create Code 128 Code Set C image in VS .NET applications.
Read Code 128 Code Set B In Visual C#.NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
ConsoleWriteLine("Is 3 a factor of 9 " + isFactor(9, 3)); ConsoleWriteLine("Is 3 a factor of 10 " + isFactor(10, 3)); } }
Painting Bar Code In Visual C#.NET
Using Barcode creator for VS .NET Control to generate, create barcode image in .NET applications.
Recognize Bar Code In C#
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
The output is shown here:
Print Code128 In .NET Framework
Using Barcode generator for ASP.NET Control to generate, create USS Code 128 image in ASP.NET applications.
Code 128A Creation In .NET Framework
Using Barcode encoder for Visual Studio .NET Control to generate, create USS Code 128 image in .NET framework applications.
The reciprocal of 4 is 025 The reciprocal of 10 is 01 Is 3 a factor of 9 True Is 3 a factor of 10 False
USS Code 128 Printer In VB.NET
Using Barcode generation for .NET Control to generate, create Code 128 Code Set B image in .NET applications.
ANSI/AIM Code 39 Printer In C#
Using Barcode creation for Visual Studio .NET Control to generate, create Code-39 image in Visual Studio .NET applications.
In the program, first notice how the delegates are declared The Transform delegate takes a double argument and returns a double result The TestInts delegate takes two int arguments and returns a bool result Next, pay special attention to these declarations:
Barcode Creation In Visual C#
Using Barcode creator for Visual Studio .NET Control to generate, create bar code image in .NET applications.
Generate Code 128 In Visual C#.NET
Using Barcode encoder for .NET framework Control to generate, create Code 128B image in Visual Studio .NET applications.
Transform reciprocal = n => 10 / n; TestInts isFactor = (n, d) => n % d == 0;
Data Matrix 2d Barcode Drawer In C#.NET
Using Barcode encoder for .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
Printing UCC - 14 In C#
Using Barcode maker for .NET framework Control to generate, create ITF-14 image in .NET framework applications.
The first assigns to reciprocal a lambda expression that returns the reciprocal of the value that it is passed This expression can be assigned to a Transform delegate because it is compatible with Transform s declaration The argument used in the call to reciprocal is passed to n The value returned is the result of the expression 10 / n The second statement assigns to isFactor an expression that returns true if the second argument is a factor of the first This lambda takes two arguments, and it returns true if the first can be evenly divided by the second Thus, it is compatible with the TestInts declaration The two arguments passed to isFactor( ) when it is called are automatically passed to n and d, in that order One other point: The parentheses around the parameters n and d are necessary The parentheses are optional only when one parameter is used
Printing UPC - 13 In VB.NET
Using Barcode encoder for .NET framework Control to generate, create EAN / UCC - 13 image in .NET applications.
DataMatrix Printer In Objective-C
Using Barcode maker for iPad Control to generate, create Data Matrix ECC200 image in iPad applications.
Statement Lambdas
Print Code 3 Of 9 In Java
Using Barcode creation for Java Control to generate, create Code-39 image in Java applications.
Linear Barcode Creation In Visual Basic .NET
Using Barcode printer for Visual Studio .NET Control to generate, create 1D image in .NET framework applications.
A statement lambda expands the types of operations that can be handled directly within a lambda expression For example, using a statement lambda, you can use loops, if statements, declare variables, and so on A statement lambda is easy to create Simply enclose the body of the lambda expression within braces Here is an example that uses a statement lambda to compute and return the factorial of an int value:
UPC-A Supplement 5 Encoder In Objective-C
Using Barcode maker for iPad Control to generate, create UPCA image in iPad applications.
UPC Symbol Generator In Java
Using Barcode generation for Java Control to generate, create UPCA image in Java applications.
// Demonstrate a statement lambda using System; // IntOp takes one int argument and returns an int result delegate int IntOp(int end); class StatementLambdaDemo {
Barcode Generator In Objective-C
Using Barcode creation for iPhone Control to generate, create barcode image in iPhone applications.
Barcode Creation In None
Using Barcode maker for Microsoft Word Control to generate, create bar code image in Microsoft Word applications.
14: Introducing LINQ
static void Main() { // A statement lambda that returns the factorial // of the value it is passed IntOp fact = n => { int r = 1; for(int i=1; i <= n; i++) r = i * r; return r; };
This is a statement lambda
ConsoleWriteLine("The factorial of 3 is " + fact(3)); ConsoleWriteLine("The factorial of 5 is " + fact(5)); } }
The output is shown here:
The factorial of 3 is 6 The factorial of 5 is 120
In the program, notice that the statement lambda declares a variable called r, uses a for loop, and has a return statement These are legal inside a statement lambda In essence, a statement lambda closely parallels an anonymous method Therefore, many anonymous methods will be converted to statement lambdas when updating legacy code One other point: When a return statement occurs within a lambda expression, it simply causes a return from the lambda It does not cause the enclosing method to return
Try This
Use Lambda Expressions to Implement Event Handlers
Since lambda expressions can be assigned to delegates, they can also be used as event handlers In this capacity, lambda expressions can be used in place of an anonymous method in many cases The example developed here illustrates the use of both an expression lambda and a statement lambda as an event handler
Step by Step
1 Create an event delegate called MyEventHandler and an event class called MyEvent,
as shown here:
// Declare a delegate type for an event delegate void MyEventHandler(); // Declare a class with an event class MyEvent {
(continued)
C# 30: A Beginner s Guide
public event MyEventHandler SomeEvent; // This is called to fire the event public void Fire() { if(SomeEvent != null) SomeEvent(); } } 2 Begin creating a class called LambdaEventHandlers that will generate and handle events,
as shown here:
class LambdaEventHandlers { static void Main() { MyEvent evt = new MyEvent(); int count = 0;
Notice that Main( ) creates an event referred to by evt and declares count as an integer variable that is initialized to zero
3 Add an event handler that increments count to evt s event chain, as shown here: // This expression lambda increments count when // the event occurs evtSomeEvent += () => count++;
This uses an expression lambda as the event handler Notice that it can use the outer variable count The same rules regarding the use of outer variables that apply to anonymous methods (described in 12) also apply to lambda expressions
4 Add an event handler to evt that displays the value of count, as shown next: // This statement lambda displays the value of count // If count is greater than 3, it is reset to 0 evtSomeEvent += () => { if(count > 3) count = 0; ConsoleWriteLine("Count is " + count); };
This uses a statement lambda to display the current value of count Before doing so, it tests the value of count If it is greater than 3, it is reset to zero
5 Complete LambdaEventHandlers by invoking the event five times: // Fire the event five times evtFire(); evtFire(); evtFire(); evtFire(); evtFire(); } }
Copyright © OnBarcode.com . All rights reserved.