print barcode with vb.net Invoke the indexer s set accessor in C#.NET

Encoding Code 128 Code Set A in C#.NET Invoke the indexer s set accessor

Invoke the indexer s set accessor
Code 128C Maker In Visual C#.NET
Using Barcode generation for Visual Studio .NET Control to generate, create Code 128 Code Set A image in .NET applications.
ANSI/AIM Code 128 Reader In C#
Using Barcode scanner for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Invoke the indexer s get accessor
Draw Barcode In Visual C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create bar code image in Visual Studio .NET applications.
Decode Bar Code In Visual C#.NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications.
// Now, generate failures ConsoleWriteLine("\nFail with error reports"); for(int i=0; i < (fsLength * 2); i++) { fs[i] = i*10; if(fsErrFlag) ConsoleWriteLine("fs[" + i + "] out-of-bounds"); } for(int i=0; i < (fsLength * 2); i++) { x = fs[i]; if(!fsErrFlag) ConsoleWrite(x + " "); else ConsoleWriteLine("fs[" + i + "] out-of-bounds"); } } }
Code128 Printer In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create Code 128 image in ASP.NET applications.
Draw Code 128 In .NET
Using Barcode creation for Visual Studio .NET Control to generate, create Code 128A image in .NET framework applications.
7:
Encoding Code 128B In Visual Basic .NET
Using Barcode encoder for .NET Control to generate, create ANSI/AIM Code 128 image in VS .NET applications.
USS-128 Printer In C#
Using Barcode generator for .NET Control to generate, create GTIN - 128 image in .NET applications.
Operator Overloading, Indexers, and Properties
Encoding Matrix 2D Barcode In Visual C#.NET
Using Barcode creation for VS .NET Control to generate, create 2D Barcode image in .NET applications.
EAN 13 Generation In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create EAN / UCC - 13 image in .NET applications.
The output from the program is shown here:
Encode Bar Code In C#.NET
Using Barcode drawer for .NET Control to generate, create bar code image in Visual Studio .NET applications.
Intelligent Mail Generator In C#.NET
Using Barcode maker for VS .NET Control to generate, create USPS OneCode Solution Barcode image in .NET framework applications.
Fail quietly 0 10 20 30 40 0 0 0 0 0 Fail with error reports fs[5] out-of-bounds fs[6] out-of-bounds fs[7] out-of-bounds fs[8] out-of-bounds fs[9] out-of-bounds 0 10 20 30 40 fs[5] out-of-bounds fs[6] out-of-bounds fs[7] out-of-bounds fs[8] out-of-bounds fs[9] out-of-bounds
Paint Code 3 Of 9 In None
Using Barcode printer for Office Excel Control to generate, create Code-39 image in Excel applications.
Decode Bar Code In C#.NET
Using Barcode Control SDK for .NET Control to generate, create, read, scan barcode image in .NET framework applications.
This output is similar to that produced by the previous version of the program shown in 6 In this version, the indexer prevents the array boundaries from being overrun Let s look closely at each part of the indexer It begins with this line:
Create USS Code 128 In Java
Using Barcode maker for BIRT Control to generate, create Code 128 Code Set B image in BIRT reports applications.
Making UPC-A In Visual Studio .NET
Using Barcode maker for ASP.NET Control to generate, create UPC-A Supplement 2 image in ASP.NET applications.
public int this[int index] {
Decoding GS1-128 In C#.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications.
Barcode Creation In None
Using Barcode maker for Font Control to generate, create bar code image in Font applications.
This declares an indexer that operates on int elements The index is passed in index The indexer is public, allowing it to be used by code outside of its class The get accessor is shown here:
Painting Data Matrix 2d Barcode In Java
Using Barcode generation for Java Control to generate, create Data Matrix ECC200 image in Java applications.
Code 39 Full ASCII Decoder In Visual Basic .NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.
get { if(ok(index)) { ErrFlag = false; return a[index]; } else { ErrFlag = true; return 0; } }
The get accessor prevents array boundary errors If the specified index is within bounds, the element corresponding to the index is returned If it is out of bounds, no operation takes place and no overrun occurs In this version of FailSoftArray, a variable called ErrFlag contains the outcome of each operation This field can be examined after each operation to assess the success or failure of the operation (In 10, you will see a better way to handle errors by using C# s exception subsystem, but for now, using an error flag is an acceptable approach) The set accessor is shown here It, too, prevents a boundary error
set { if(ok(index)) { a[index] = value;
C# 30: A Beginner s Guide
ErrFlag = false; } else ErrFlag = true; }
In this case, if index is within bounds, the value passed in value is assigned to the corresponding element Otherwise, ErrFlag is set to true Recall that in an accessor method, value is an automatic parameter that contains the value being assigned You do not need to (nor can you) declare it It is not necessary for an indexer to provide both get and set You can create a readonly indexer by implementing only the get accessor You can create a write-only indexer by implementing only set It is important to understand that there is no requirement that an indexer actually operate on an array It simply must provide functionality that appears array-like to the user of the indexer For example, the following program has an indexer that acts like a read-only array that contains the powers of 2 from 0 to 15 Notice, however, that no actual array exists Instead, the indexer simply computes the proper value for a given index
// Indexers don't have to operate on actual arrays using System; class PwrOfTwo { /* Access a logical array that contains the powers of 2 from 0 to 15 */ public int this[int index] { // Compute and return power of 2 get { if((index >= 0) && (index < 16)) return Pwr(index); else return -1; }
Here, no underlying array is used
// There is no set accessor } int Pwr(int p) { int result = 1; for(int i=0; i<p; i++) result *= 2; return result; } } class UsePwrOfTwo { static void Main() { PwrOfTwo pwr = new PwrOfTwo();
7:
Operator Overloading, Indexers, and Properties
ConsoleWrite("First 8 powers of 2: "); for(int i=0; i < 8; i++) ConsoleWrite(pwr[i] + " "); ConsoleWriteLine(); ConsoleWrite("Here are some errors: "); ConsoleWrite(pwr[-1] + " " + pwr[17]); } }
The output from the program is shown here:
First 8 powers of 2: 1 2 4 8 16 32 64 128 Here are some errors: -1 -1
Notice that the indexer for PwrOfTwo includes a get accessor, but no set accessor As explained, this means that the indexer is read-only Thus, a PwrOfTwo object can be used on the right side of an assignment statement, but not on the left For example, attempting to add this statement to the preceding program won t work:
Copyright © OnBarcode.com . All rights reserved.