create pdf417 barcode in c# Caution in C#.NET

Maker PDF417 in C#.NET Caution

Caution
Drawing PDF-417 2d Barcode In C#
Using Barcode creation for .NET Control to generate, create PDF 417 image in .NET applications.
www.OnBarcode.com
Scanning PDF-417 2d Barcode In Visual C#
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
I don t recommend disabling the interface. If you disable it, data binding will not be able to interact with your object as it expects, and you may have to write extra UI code to compensate.
Barcode Printer In Visual C#.NET
Using Barcode drawer for .NET framework Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Barcode Encoder In C#
Using Barcode generator for VS .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
The BindingEdit Property
GS1 - 12 Generator In C#.NET
Using Barcode generation for .NET Control to generate, create UPC Code image in VS .NET applications.
www.OnBarcode.com
Drawing EAN / UCC - 14 In C#.NET
Using Barcode printer for .NET framework Control to generate, create UCC - 12 image in Visual Studio .NET applications.
www.OnBarcode.com
In addition to the DisableIEditableObject property, the BindingEdit property is used as a flag to indicate whether the n-level undo behavior was invoked through the BeginEdit() method from the IEditableObject interface. This flag allows the BeginEdit() method to only honor the first call. The BindingEdit property is implemented in the UndoableBase class, because it is also used by some of the n-level undo behaviors I ll discuss in 13.
Print Data Matrix In C#
Using Barcode creator for .NET framework Control to generate, create ECC200 image in VS .NET applications.
www.OnBarcode.com
Code 93 Extended Generation In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create ANSI/AIM Code 93 image in VS .NET applications.
www.OnBarcode.com
The BeginEdit Method
PDF-417 2d Barcode Maker In None
Using Barcode creator for Font Control to generate, create PDF417 image in Font applications.
www.OnBarcode.com
Encode PDF-417 2d Barcode In None
Using Barcode printer for Word Control to generate, create PDF 417 image in Word applications.
www.OnBarcode.com
The BeginEdit() method uses the DisableIEditableObject and BindingEdit properties to determine whether to do any work. Here s the BeginEdit() code: void System.ComponentModel.IEditableObject.BeginEdit() { if (!_disableIEditableObject && !BindingEdit) { BindingEdit = true; BeginEdit(); } } This method only performs real work if the interface is enabled (which it is by default) and if this is the first call to the method when BindingEdit is false. In that case, it sets BindingEdit to true to indicate that the object is reacting to the IEditableObject interface, and it calls the n-level undo
Read UPC-A Supplement 2 In .NET Framework
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Data Matrix ECC200 Drawer In None
Using Barcode creator for Font Control to generate, create DataMatrix image in Font applications.
www.OnBarcode.com
C HAPTE R 10 DA TA BINDIN G
Generating Code 128B In Java
Using Barcode generation for Java Control to generate, create Code 128 image in Java applications.
www.OnBarcode.com
Encoding PDF 417 In None
Using Barcode drawer for Font Control to generate, create PDF417 image in Font applications.
www.OnBarcode.com
BeginEdit() method that I ll discuss in 13. For now, it is enough to know that this call to BeginEdit() takes a snapshot of the object s current state so it can be restored later if necessary.
GS1 - 12 Recognizer In C#.NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Printing EAN / UCC - 13 In VS .NET
Using Barcode creator for ASP.NET Control to generate, create EAN / UCC - 13 image in ASP.NET applications.
www.OnBarcode.com
The CancelEdit Method
Linear Generator In VS .NET
Using Barcode creation for ASP.NET Control to generate, create Linear image in ASP.NET applications.
www.OnBarcode.com
Encoding Barcode In None
Using Barcode printer for Software Control to generate, create Barcode image in Software applications.
www.OnBarcode.com
The CancelEdit() implementation works in a similar manner, first checking the properties to determine whether it should do any work. void System.ComponentModel.IEditableObject.CancelEdit() { if (!_disableIEditableObject && BindingEdit) { CancelEdit(); if (IsNew && _neverCommitted && EditLevel <= EditLevelAdded) { if (Parent != null) Parent.RemoveChild(this); } } } If this method does do work, it calls another CancelEdit() method, which is part of the n-level undo functionality I ll discuss in 13. That method restores the object s state to the most recent snapshot the snapshot taken when BeginEdit() was called. The next block of code is a bit complex and is necessary to support parent-child relationships. If this object is a child of some other object, then it is possible that it was just added as a child when BeginEdit() was called. If that s the case, then when CancelEdit() is called, this object should be removed as a child. Consider this from the user s perspective. The user adds an item to a collection and starts editing that item. The user then realizes he doesn t really want to add it, so he presses Esc or performs some other UI gesture to cancel what he s doing. In this case, this new item s state isn t rolled back, because the user expects the new item to just go away entirely. The call to Parent.RemoveChild() tells the parent object to remove this child entirely, which meets the user s expectation. The best way to see this is to bind a collection to a DataGrid control, move to the last row so a new item is added, and then press Esc. Notice how the new item just disappears This code enables that behavior.
Making QR Code ISO/IEC18004 In Objective-C
Using Barcode generation for iPhone Control to generate, create QR Code image in iPhone applications.
www.OnBarcode.com
Scan QR Code In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Note
In reality, this shouldn t be a common occurrence. Windows Forms 2.0 and higher uses a new interface, ICancelAddNew, that is implemented by BindingList<T>. This interface notifies the collection that the child should be removed, rather than notifying the child object itself. The code in the RemoveItem() method takes care of the ICancelAddNew case automatically, so this code is really here to support backward compatibility for anyone explicitly calling the IEditableObject interface on child objects.
The EndEdit Method
The final method is EndEdit(), which data binding calls when the changes to the object should be accepted. In other words, the snapshot taken by BeginEdit() can be discarded at this point, because there s no going back. This is the simplest of the three methods:
Copyright © OnBarcode.com . All rights reserved.