Convert a collection of strings to a comma separated list. : List « Collections Data Structure « C# / C Sharp

1. C# / C Sharp
2. Collections Data Structure
3. List

Convert a collection of strings to a comma separated list.

    

//http://facebooktoolkit.codeplex.com/
//http://facebooktoolkit.codeplex.com/license
using System.Collections.Generic;
using System.Text;

namespace Facebook.Utility
{
    /// <summary>
    /// Helper functions for string manipulation
    /// </summary>
    public static class StringHelper
    {
        /// <summary>
        /// Convert a collection of strings to a comma separated list.
        /// </summary>
        /// <param name="collection">The collection to convert to a comma separated list.</param>
        /// <returns>comma separated string.</returns>
        public static string ConvertToCommaSeparated<T>(IList<T> collection)
        {
            // assumed that the average string length is 10 and double the buffer multiplying by 2
            // if this does not fit in your case, please change the values
            int preAllocation = collection.Count * 10 * 2;
            var sb = new StringBuilder(preAllocation);
            int i = 0;
            bool isString = typeof(T) == typeof(string);

            foreach (T key in collection)
            {
                if (isString)
                {
                    sb.Append('\'');
                }

                sb.Append(key.ToString());

                if (isString)
                {
                    sb.Append('\'');
                }
                if (i < collection.Count - 1)
                    sb.Append(",");

                i++;
            }
            return sb.ToString();
        }
    }
}

   
    
    
    
  

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