示例#1
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 /// <summary>
 /// Concatenates line-list items.
 /// </summary>
 public static IEnumerable <LineListItem> Concat(this LineListItem first, IEnumerable <LineListItem> second) => second.Prepend(first);
示例#2
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 /// <summary>
 /// Returns a sequence of two line-list items.
 /// </summary>
 public static IEnumerable <LineListItem> Append(this LineListItem first, LineListItem second) =>
 Enumerable.Empty <LineListItem>().Append(first).Append(second);
示例#3
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 /// <summary>
 /// Returns a sequence of two line-list items.
 /// </summary>
 public static IEnumerable <LineListItem> AppendLineListItem(this ComponentListItem item, LineListItem lineListItem) =>
 ((LineListItem)item).Append(lineListItem);