List扩展WhereIF

/// <summary>
/// WhereIF扩展
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="source"></param>
/// <param name="where"></param>
/// <param name="predicate"></param>
/// <returns></returns>
public static IEnumerable<TSource> WhereIF<TSource>(this IEnumerable<TSource> source,bool where , Func<TSource, bool> predicate)
{
if (where)
return source.Where(predicate);

return source;
}