[英]GetItem on TDictionary eleminated by linker
I am using a TDictionary
of <string, string>
. 我正在使用<string, string>
的TDictionary
。 But for some reason, the linker decides that I do not want to get items out of it. 但是由于某种原因,链接器决定我不想从中取出项目。
I have the following code: 我有以下代码:
function TSheet.GetFieldName(Field: string; Default: string): string;
begin
Result := Default;
if FFieldNames[Field] = '' then
Result := Field
else
Result := FFieldNames[Field];
end;
FFieldNames
is a TDictionary<string, string>
. FFieldNames
是TDictionary<string, string>
。 On line 2 ( if FFieldNames[Field] = '' then
), it throws a 'File not found' exception. 在第2行( if FFieldNames[Field] = '' then
),它将引发“找不到文件”异常。 Adding FFieldNames[Field]
to my watch tells me that Function to be called, {System.Generics.Collections}TDictionary.GetItem, was eliminated by linker . 在我的手表中添加FFieldNames[Field]
告诉我, 链接器消除了要调用的函数{System.Generics.Collections} TDictionary.GetItem 。
Someone asked here on a similar issue on how to avoid the linker eliminating functions during debugging. 这里有人问过类似的问题 ,即如何避免链接器在调试期间消除功能。 From this I gathered, that the compiler/linker assumes that I am not using it. 从此我收集到,编译器/链接器假定我没有使用它。 Someone suggested - during conversation - that I should try using it more . 在谈话中有人建议我应该尝试更多使用它。
So I created the following code: 因此,我创建了以下代码:
FFieldNames.Add(Name, S);
V := FFieldNames.Items[Name];
Where S
, Name
and V
are strings. 其中S
, Name
和V
是字符串。 This is from the code where FFieldNames
is filled with data. 这是从FFieldNames
填充数据的代码中FFieldNames
。 V
's only purpose is to obtain the just inserted S
; V
的唯一目的是获得刚刚插入的S
; it does nothing else. 它什么也没做。
Strangely, while the debugger tells me the same thing (ie GetItem
being eliminated), V
does get set to the expected value. 奇怪的是,尽管调试器告诉我同样的事情(即,删除了GetItem
),但V
确实设置为期望值。 But it does not in my TSheet.GetFieldName
function. 但是它不在我的TSheet.GetFieldName
函数中。 :| :|
What am I missing? 我想念什么?
The same problem applies to TList<>
. 相同的问题适用于TList<>
。 Even if the code is using a method in the class it is not accessible from the debugger ("xxx on TList eliminated by linker"). 即使代码在类中使用方法,也无法从调试器访问它(“链接器消除了TList上的xxx”)。 I guess this is a problem with generics in general. 我想这通常是泛型的问题。
If you make a descendent class it will not have this problem 如果您进行后代课程,则不会有此问题
type
TMyList = class(TList<TMyObject>)
end;
var
List : TMyList;
begin
...
end;
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