Converts a collection of tags to a single string representation containing the tags separated by a comma

    

using System;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Text;
using System.Windows.Data;

namespace Photoviewer.Common
{
    /// <summary>
    /// Specialized converter to convert between a tag collection
    /// and a string representation of the tags
    /// </summary>
    public class TagsValueConverter : IValueConverter
    {
        #region IValueConverter Members

        /// <summary>
        /// Converts a collection of tags to a single string representation
        /// containing the tags separated by a comma
        /// </summary>
        /// <param name="value"></param>
        /// <param name="targetType"></param>
        /// <param name="parameter"></param>
        /// <param name="culture"></param>
        /// <returns></returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (!(value is Collection<string>))
            {
                return null;
            }

            StringBuilder outputBuilder = new StringBuilder();
            bool first = true;

            foreach (string item in (Collection<string>)value)
            {
                if (!first)
                {
                    outputBuilder.Append(", ");
                }

                outputBuilder.Append(item);
                first = false;
            }

            return outputBuilder.ToString();
        }

        /// <summary>
        /// Converts a set of tags separated by a comma back to
        /// a collection of tags
        /// </summary>
        /// <param name="value"></param>
        /// <param name="targetType"></param>
        /// <param name="parameter"></param>
        /// <param name="culture"></param>
        /// <returns></returns>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string[] parts = value.ToString().Split(',');
            Collection<string> tags = new Collection<string>();

            foreach (string tag in parts)
            {
                tags.Add(tag.Trim());
            }

            return tags;
        }

        #endregion
    }
}

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Converts a collection of tags to a single string representation containing the tags separated by a comma : String Split « Data Types « C# / C Sharp

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