File: src\Framework\System\Windows\SizeChangedEventHandler.cs
Project: wpf\PresentationFramework.csproj (PresentationFramework)

using System;
namespace System.Windows
{
    /// <summary>
    ///     The delegate to use for handlers that receive ComputedWidthChanged and ComputedHeightChanged.
    /// </summary>
    public delegate void SizeChangedEventHandler(object sender, SizeChangedEventArgs e);
}