MasteringVFP/2/5

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在2006年5月27日 (六) 20:43由1148765113 (對話 | 貢獻)所做的修訂版本
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'&.' 與 Evaluate()

說到這二個特性,我不得不說當初 VFP 開發小組真是眼光卓炬~讓開發者可以很自由的讓程式可以放到變數裡面去.

& 是指巨集. 如何來使用呢?舉例來說:

dd="1+1"

你可以接著在command window 中輸入

? &dd.

別忘了使用"&"在結束時,要加上".",以上面的這一個sample 來看,在一個變數中存著一段字串,這一個字串是要一個合法,可以執行的指令,利用這一個"&",你可以動態的來完成一個命令

可是在後來的Help 中都不太建議你再使用 "&" 而會建議你用Evaluate(cString) 這樣也可以做到相同的結果

? evaluate(dd)

如果你想在別的語言試試看,我可以先告訴你不管是 Java 或 .NET ,這可都是一個進階技巧.










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