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PropertyChangingEventArgs Class

.NET Framework 4

Provides data for the PropertyChanging event.

System.Object
  System.EventArgs
    System.ComponentModel.PropertyChangingEventArgs

Namespace:  System.ComponentModel
Assembly:  System (in System.dll)
C#
C++
F#
VB
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[HostProtectionAttribute(SecurityAction.LinkDemand, SharedState = true)]
public class PropertyChangingEventArgs : EventArgs

The PropertyChangingEventArgs type exposes the following members.

  Name Description
Public method PropertyChangingEventArgs Initializes a new instance of the PropertyChangingEventArgs class.
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  Name Description
Public property PropertyName Gets the name of the property whose value is changing.
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  Name Description
Public method Equals(Object) Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method ToString Returns a string that represents the current object. (Inherited from Object.)
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Note Note

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

.NET Framework

Supported in: 4, 3.5 SP1, 3.0 SP1, 2.0 SP1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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Ability to cancel implied?
Passing the new value at the same time would be good, but just because you want to be notified that the property is changing doesn't imply that you want to be able to cancel the change.
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Serious lack: no value, no inheriting from CancelEventArgs.

This is really stupid having this property without passing the candidate value, since there is no wat to get it as the property was not yet set.
In addition the fact that this property doesn't inherit CancelEventArgs is also not so clever, but I can live with it throwing exceptions instead (even exception cost much performance the marking an innocent e.Cancel property).

So based on the above, this class should inherit from CancelEventArgs, and should pass the set-attempt value.

I posted a connection, please vote: https://connect.microsoft.com/VisualStudio/feedback/details/580994/propertychangingeventargs-class-should-inherit-from-canceleventargs

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