MasteringVFP/2/5

=== '&.' 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:
<pre>
dd="1+1"
</pre>
你可以接著在command window 中輸入
<pre>
? &dd.
</pre>
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
<pre>
? evaluate(dd)
</pre>

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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