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ASP.NET Optimistic Concurrency Control

, 19 Aug 2003 172.4K 2.2K 111
How to implement the optimistic concurrency control without the DataSet
Stored Procedures
using System;
using System.Reflection;
using System.Collections;

namespace Concurrency.BLL
	/// <summary>
	/// Represents an object difference
	/// </summary>
	public class ObjectDifference

		#region Constructors

		/// <summary>
		/// Initializes a new instance of the object difference class
		/// </summary>
		public ObjectDifference()

		/// <summary>
		/// Initializes a new instance of the object difference class
		/// </summary>
		/// <param name="propertyName">Property name</param>
		/// <param name="firstValue">Property value for the first object</param>
		/// <param name="secondObject">Property value for the second object</param>
		public ObjectDifference(string propertyName, object firstValue, object secondValue)
			_propertyName = propertyName;
			_firstValue = firstValue;
			_secondValue = secondValue;


		#region Methods

		/// <summary>
		/// Gets the differences between two objects
		/// </summary>
		/// <param name="firstObject">First object to compare</param>
		/// <param name="secondObject">Second object to compare</param>
		/// <returns>IList containing the differences. The objects on the IList are of ObjectDifference type</returns>
		public static IList GetDifferences(object firstObject, object secondObject)
			Type firstType = firstObject.GetType();
			Type secondType = secondObject.GetType();
			object firstValue;
			object secondValue;
			ArrayList differences = new ArrayList();

			// Both objects must be of the same type
			if (firstType != secondType)
				throw new Exception("The objects type must be the same.");

			foreach (PropertyInfo property in firstType.GetProperties())
				// Get the value for each object
				firstValue = property.GetValue(firstObject, null);
				secondValue = property.GetValue(secondObject, null);

				// Compate the values. If they are different, add to the collection
				if (!firstValue.Equals(secondValue))
					differences.Add( new ObjectDifference(property.Name, firstValue, secondValue) );

			return differences;


		#region Properties

		private string _propertyName;
		private object _firstValue;
		private object _secondValue;

		public string PropertyName
			get { return _propertyName; }
			set { _propertyName = value; }

		public object FirstValue
			get { return _firstValue; }
			set { _firstValue = value; }

		public object SecondValue
			get { return _secondValue; }
			set { _secondValue = value; }



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Web Developer
United States United States
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