public static IList <TResult> AsReadOnlyIf <T, TResult>(this IEnumerable <T> source, bool condition, bool emptyIfNull = default)
where T : class, IAsReadOnly <T>
where TResult : class, T
{
//
if (source is null)
{
return(emptyIfNull ? (condition ? (IList <TResult>)ListReadOnlyWrap <TResult> .Empty : new List <TResult>()) : null);
}
else if (condition)
{
var traversal = P_ConvertAsReadOnly <T, TResult> .Convert(source : source, isReadOnly : true).ToArray();
if (traversal.Length == 0)
{
return(ListReadOnlyWrap <TResult> .Empty);
}
else
{
return(new ListReadOnlyWrap <TResult>(list: traversal));
}
}
else
{
return(new List <TResult>(collection: P_ConvertAsReadOnly <T, TResult> .Convert(source: source, isReadOnly: false)));
}
}
public static void AsReadOnlyIf <T, TResult>(this T value, bool condition, out TResult result)
where T : class, IAsReadOnly <T>
where TResult : class, T
=> result = P_ConvertAsReadOnly <T, TResult> .Convert(value : value, isReadOnly : condition);
public static TResult AsReadOnlyIf <T, TResult>(this T value, bool condition)
where T : class, IAsReadOnly <T>
where TResult : class, T
=> P_ConvertAsReadOnly <T, TResult> .Convert(value : value, isReadOnly : condition);
