AddingNewEventArgs Class

Reference

Definition

Namespace:: System.ComponentModel

Assembly:: System.ComponentModel.TypeConverter.dll

Assembly:: System.dll

Assembly:: netstandard.dll

Source:: AddingNewEventArgs.cs

Source:: AddingNewEventArgs.cs

Source:: AddingNewEventArgs.cs

Important

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Provides data for the AddingNew event.

public ref class AddingNewEventArgs : EventArgs

public class AddingNewEventArgs : EventArgs

type AddingNewEventArgs = class
    inherit EventArgs

Public Class AddingNewEventArgs
Inherits EventArgs

Inheritance: Object

EventArgs
AddingNewEventArgs

Examples

The following code example demonstrates how to use the AddingNewEventArgs class to handle the BindingSource.AddingNew event. This code example is part of a larger example provided in How to: Customize Item Addition with the Windows Forms BindingSource.

// This event handler provides custom item-creation behavior.
void OnCustomersBindingSourceAddingNew(Object^ sender, 
    AddingNewEventArgs^ e)
{
    e->NewObject = DemoCustomer::CreateNewCustomer();
}

// This event handler provides custom item-creation behavior.
void customersBindingSource_AddingNew(
    object sender, 
    AddingNewEventArgs e)
{
    e.NewObject = DemoCustomer.CreateNewCustomer();
}

' This event handler provides custom item-creation behavior.
 Private Sub customersBindingSource_AddingNew( _
 ByVal sender As Object, _
 ByVal e As AddingNewEventArgs) _
 Handles customersBindingSource.AddingNew

     e.NewObject = DemoCustomer.CreateNewCustomer()

 End Sub

Remarks

The AddingNewEventArgs class provides data for the BindingSource.AddingNew event, which signals that an item is about to be added to a collection. The event gives the programmer, within the event handler AddingNewEventHandler, the option of supplying the new object by setting the NewObject property to this new item. If this property is not set, the collection will typically use the parameterless constructor of the appropriate type to construct a new item. In either case, the new item will be added to the collection.

If the collection also implements the ICancelAddNew interface, the item will be provisionally added, waiting a subsequent commit or rollback.

This event is commonly used in data-binding scenarios, within classes such as System.Windows.Forms.BindingSource and System.ComponentModel.BindingList<T>.

For more information about how to handle events, see Handling and Raising Events.

Constructors

AddingNewEventArgs()	Initializes a new instance of the AddingNewEventArgs class using no parameters.
AddingNewEventArgs(Object)	Initializes a new instance of the AddingNewEventArgs class using the specified object as the new item.

Properties

NewObject

Gets or sets the object to be added to the binding list.

Methods

Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

Applies to

Споделяне чрез