如何修改TList< record>值？ [英] How to modify TList<record> value?

问题描述

Delphi 2010
如何修改TList<记录>值？

Delphi 2010 How to modify TList < record > value ?

type TTest = record a,b,c:Integer end;
var List:TList<TTest>;
    A:TTest;
    P:Pointer;
....
....

List[10] := A;  <- OK
List[10].a:=1;  <- Here compiler error : Left side cannot be assined to
P:=@List[10];   <- Error: Variable requied

推荐答案

A := List[10];
A.a := 1;
list[10] := A;

您不必这样做，因为它们是引用类型（通过指针，编译器在内部管理以保持头发，但记录是值类型，所以它不会这样工作。

You don't have to do this with objects because they're reference types, (accessed through a pointer which the compiler manages internally to keep it out of your hair,) but records are value types so it doesn't work that way.

这篇关于如何修改TList&lt; record&gt;值？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！