/V2.2/trunk/Quickstarts/Commanding/Desktop/Commanding.OrderModule/Converter/StringToNullableNumberConverter.cs

//===================================================================================

// Microsoft patterns & practices

// Composite Application Guidance for Windows Presentation Foundation and Silverlight

//===================================================================================

// Copyright (c) Microsoft Corporation.  All rights reserved.

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY

// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT

// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

// FITNESS FOR A PARTICULAR PURPOSE.

//===================================================================================

// The example companies, organizations, products, domain names,

// e-mail addresses, logos, people, places, and events depicted

// herein are fictitious.  No association with any real company,

// organization, product, domain name, email address, logo, person,

// places, or events is intended or should be inferred.

//===================================================================================

using System;

using System.Globalization;

using System.Windows.Data;



namespace Commanding.Modules.Order.Converter

{

    public class StringToNullableNumberConverter : IValueConverter

    {

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)

        {

            return value;

        }



        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

        {

            string stringValue = value as string;

            if (stringValue != null)

            {

                if (targetType == typeof(int?))

                {

                    int result;

                    if (int.TryParse(stringValue, out result))

                        return result;

                    

                    return null;

                }



                if (targetType == typeof(decimal?))

                {

                    decimal result;

                    if (decimal.TryParse(stringValue, out result))

                        return result;



                    return null;

                }

            }



            return value;

        }

    }

}