/// <summary>
/// Returns a generic <see cref="IReadOnlyList{T}"/>
/// of <see cref="ValueType"/> values parsed
/// from a collection of strings using a specified
/// <see cref="TryParseFromString{T}"/> delegate,
/// ignoring any values which cannot be parsed
/// and optionally having duplicates removed.
/// </summary>
/// <typeparam name="T">
/// The type of array to return, must
/// be a <see cref="ValueType"/>.
/// </typeparam>
/// <param name="strings">
/// A collection of strings to be converted
/// to <typeparamref name="T"/>.
/// </param>
/// <param name="tryParseDelegate">
/// A delegate method conforming to the
/// <see cref="TryParseFromString{T}"/>
/// signature, for optimized type conversion
/// via a "TryParse" method common to many
/// primitive <see cref="ValueType"/> classes.
/// </param>
/// <param name="removeDuplicates">
/// Whether to remove duplicate items in the array returned.
/// Parameter is optional, default value is <c>false</c>.
/// </param>
/// <returns>
/// A list of type <typeparamref name="T"/>.
/// </returns>
public static IReadOnlyList <T> ToEnumerable <T>(
this IEnumerable <string> strings,
TryParseFromString <T> tryParseDelegate,
bool removeDuplicates = ConvertStructCollection.DefaultRemoveDuplicates)
where T : struct
{
return(strings.ToList(
tryParseDelegate, removeDuplicates));
}
/// <summary>
/// Returns a generic <see cref="List{T}"/>
/// of <see cref="ValueType"/> values parsed
/// from a collection of strings using a specified
/// <see cref="TryParseFromString{T}"/> delegate,
/// ignoring any values which cannot be parsed
/// and optionally having duplicates removed.
/// </summary>
/// <typeparam name="T">
/// The type of array to return, must
/// be a <see cref="ValueType"/>.
/// </typeparam>
/// <param name="strings">
/// A collection of strings to be converted
/// to <typeparamref name="T"/>.
/// </param>
/// <param name="tryParseDelegate">
/// A delegate method conforming to the
/// <see cref="TryParseFromString{T}"/>
/// signature, for optimized type conversion
/// via a "TryParse" method common to many
/// primitive <see cref="ValueType"/> classes.
/// </param>
/// <param name="removeDuplicates">
/// Whether to remove duplicate items in the array returned.
/// Parameter is optional, default value is <c>false</c>.
/// </param>
/// <returns>
/// A list of type <typeparamref name="T"/>.
/// </returns>
public static List <T> ToList <T>(
this IEnumerable <string> strings,
TryParseFromString <T> tryParseDelegate,
bool removeDuplicates = ConvertStructCollection.DefaultRemoveDuplicates)
where T : struct
{
if (tryParseDelegate == null)
{
return(strings.ToList <T>(null, false, removeDuplicates));
}
List <T> list = new List <T>();
if (strings == null)
{
return(list);
}
// Do not try to parse strings that are null or white space.
foreach (string s in strings.Where(value => !string.IsNullOrWhiteSpace(value)))
{
T result;
if (!tryParseDelegate(s, out result))
{
continue;
}
if (removeDuplicates && list.Contains(result))
{
continue;
}
list.Add(result);
}
return(list);
}
