Downloads: Building WPF Applications with Self-Tracking Entity Generator - Project Setup

//-----------------------------------------------------------------------
// <copyright company="Microsoft">
//      (c) Copyright Microsoft Corporation.
//      This source is subject to the Microsoft Public License (Ms-PL).
//      Please see http://go.microsoft.com/fwlink/?LinkID=131993 for details.
//      All other rights reserved.
// </copyright>
//-----------------------------------------------------------------------

namespace System.Windows.Controls.Common
{
    /// <summary>
    /// Reservoir of attached properties for use by extension methods that require non-static information about objects.
    /// </summary>
    internal class ExtensionProperties : DependencyObject
    {
        /// <summary>
        /// Tracks whether or not the event handlers of a particular object are currently suspended.
        /// Used by the SetValueNoCallback and AreHandlersSuspended extension methods.
        /// </summary>
        public static readonly DependencyProperty AreHandlersSuspended = DependencyProperty.RegisterAttached(
            "AreHandlersSuspended",
            typeof(Boolean),
            typeof(ExtensionProperties),
            new PropertyMetadata(false)
        );
        public static void SetAreHandlersSuspended(DependencyObject obj, Boolean value)
        {
            obj.SetValue(AreHandlersSuspended, value);
        }
        public static Boolean GetAreHandlersSuspended(DependencyObject obj)
        {
            return (Boolean)obj.GetValue(AreHandlersSuspended);
        }
    }

    /// <summary>
    /// Utility class for operations.
    /// </summary>
    internal static class Extensions
    {
        #region Static Methods

        public static void SetValueNoCallback(this DependencyObject obj, DependencyProperty property, object value)
        {
            ExtensionProperties.SetAreHandlersSuspended(obj, true);
            try
            {
                obj.SetValue(property, value);
            }
            finally
            {
                ExtensionProperties.SetAreHandlersSuspended(obj, false);
            }
        }
                
        public static bool AreHandlersSuspended(this DependencyObject obj)
        {
            return ExtensionProperties.GetAreHandlersSuspended(obj);
        }

        #endregion Static Methods
    }
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Weidong Shen

Software Developer (Senior)

United States

Member

Weidong has been an information system professional since 1990. He has a Master's degree in Computer Science, and is currently a MCSD .NET

This article describes the project setup of building a WPF sample application with Self-Tracking Entity Generator for WPF/Silverlight.

Type	Article
Licence	CPOL
First Posted	7 Dec 2011
Views	25,155
Downloads	2,692
Bookmarked	44 times

C#Windows.NETDevXAML
WPFIntermediate, +

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