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[EditorBrowsable(EditorBrowsableState.Advanced)] protected virtual void OnChildChanged( object source, PropertyChangedEventArgs propertyArgs, ListChangedEventArgs listArgs) { Csla.Core.ChildChangedEventArgs args = new Csla.Core.ChildChangedEventArgs(source, propertyArgs, listArgs); if (_childChangedHandlers != null) _childChangedHandlers.Invoke(this, args); } This method uses the provided parameter values to create an instance of ChildChangedEventArgs, which is then used to raise the ChildChanged event. The event itself is declared using the custom event declaration form: [NonSerialized] [NotUndoable] private EventHandler<Csla.Core.ChildChangedEventArgs> _childChangedHandlers; public event EventHandler<Csla.Core.ChildChangedEventArgs> ChildChanged { add { _childChangedHandlers = (EventHandler<Csla.Core.ChildChangedEventArgs>) System.Delegate.Combine(_childChangedHandlers, value); } remove { _childChangedHandlers = (EventHandler<Csla.Core.ChildChangedEventArgs>) System.Delegate.Remove(_childChangedHandlers, value); } } This is substantially more code than a simple event declaration such as this: public event EventHandler<Csla.Core.ChildChangedEventArgs> ChildChanged; The reason for all the extra code is that the backing field for the event needs to be marked as NonSerialized and NotUndoable. All events on a Serializable object must be marked with NonSerialized. Failure to do this will result in serialization errors if the event is being handled by a nonserializable object such as a WPF Form or a Windows Forms Form or a Web Forms Page object. Similarly, any event declared in an undoable object (one that inherits from UndoableBase or implements IUndoableObject as discussed in 13) must mark the backing field as NotUndoable. Failure to do this will result in undo errors during data binding. This long form for declaring events allows explicit declaration of the backing field (which is otherwise autogenerated by the compiler): [NonSerialized] [NotUndoable] private EventHandler<Csla.Core.ChildChangedEventArgs> _childChangedHandlers;

vb.net code 128 reader

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Logical errors in how BaseClass is used are more complicated to find and require well-defined testing procedures The type BaseClass isn t modular because usage of the type spans different modules An argument could be made that the type BaseClass is a module in its own right The problem with that argument is that the reusable type is used too often to be considered a module Some books define a reusable type or collection of reusable types as being smaller in size3 Remember that modularity and reusability should be considered orthogonal to each other Neither modularity nor reusability should be a means to an end, and you should use each in doses As a general rule, modules implement a divide-and-conquer strategy, and reusable types implement functionality in different contexts There s a need for each, which this book will explain in more detail throughout..

2. 3.

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Code 128 VB . NET SDK - KeepAutomation.com
Complete developer guide for Code 128 size Setting and generation in Visual Basic . NET applications using KA.Barcode for VB . NET .

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Returns a subset of the objects of the sequence, based on selection criteria Selects which parts of the objects of a sequence are finally returned Skips or returns objects from a sequence Returns an IEnumerable object that joins two sequences, based on some criterion Produces a single sequence from two separate sequences Orders a sequence based on supplied criteria Groups a sequence based on supplied criteria Performs set operations on a sequence Converts sequences to various forms such as arrays, lists, and dictionaries Compares two sequences for equality Returns a particular element of a sequence Generates sequences Returns Boolean values specifying whether a particular predicate is true about a sequence Returns a single value representing characteristics of a sequence

vb.net code 128 reader

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public ref class MessageBoxClass { public: property String^ Message; property String^ Caption; int DisplayBox() { // Use pinning pointers to lock down the data while it's being // used in native code pin_ptr<const wchar_t> message = PtrToStringChars(Message); pin_ptr<const wchar_t> caption = PtrToStringChars(Caption); return MessageBoxW( 0, message, caption, MB_OK); } }; int main() { MessageBoxClass m; mMessage = "Managed string used in native function"; mCaption = "Managed Code Using Win32 Message Box"; mDisplayBox(); } In Listing 13-12, we use the Unicode form of the MessageBox function, MessageBoxW, since we re starting with a Unicode string We start to see some more complex operations as we marshal the managed String type to a native LPCWSTR parameter LPCWSTR is a typedef for const wchar_t* The PtrToStringChars function is a convenience provided in vcclrh that gives you a pointer to the underlying character array.

vb.net code 128 reader

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