想定義一個字符串類型的集合,它的值是任意無序的,我是這樣寫的: type MyString = Set of string ; 編譯就出錯如下內容: Ordinal type required 應該怎樣寫呢?

Set 只可以對應 ordinal type 的 from Delphi Help : Ordinal types include integer, character, Boolean, enumerated, and subrange types. An ordinal type defines an ordered set of values in which each value except the first has a unique predecessor and each value except the last has a unique successor. Further, each value has an ordinality, which determines the ordering of the type. For integer types, the ordinality of a value is the value itself; for all other ordinal types except subranges, the first value has ordinality 0, the next value has ordinality 1, and so forth. If a value has ordinality n, its predecessor has ordinality n – 1 and its successor has ordinality n 1. 你可看 delphi help 中有關 ordinal type 的說明取得更多的資料 若你要處理一堆字串，試試使用 Array of String 罷。

非常謝謝 Justmade 給了我詳細的解答,我要的就是一種思想, 剛從VFP轉向Delphi,好多簡單的問題都處理不了,希望我也有一天能像你一樣給別人解決問題,那將是一件非常自豪的事,謝了