Delphi 是否将DevXPress TcxFilterOperatorKind转换为字符串或从字符串转换为字符串？

下面是我用来从DevExpress网格中的筛选器获取filtertype运算符的代码片段： OperatorKindToStr用于将operatorkind作为字符串从筛选器中提取并存储在xml文件中。 StrToOperatorKind用于从xml转换回字符串，以在筛选器中设置operatorkind

const
  CUSTFILTER_FILTERITEM     = 'FilterItem';

function OperatorKindToStr(const aOperatorKind: TcxFilterOperatorKind): string;
begin
  Result := 'foEqual';
  case aOperatorKind of
    foEqual:        Result := 'foEqual';
    foNotEqual:     Result := 'foNotEqual';
    foLess:         Result := 'foLess';
    foLessEqual:    Result := 'foLessEqual';

  // Plus a boring list of other constants
end;

function StrToOperatorKind(const aOpKindStr: string): TcxFilterOperatorKind;
begin
  Result := foEqual;
  if aOpKindStr       = 'foNotEqual' then
    Result := foNotEqual
  else if aOpKindStr  = 'foLess' then
    Result := foLess
  else if aOpKindStr  = 'foLessEqual' then
    Result := foLessEqual
  else if aOpKindStr  = 'foGreater' then
    Result := foGreater
  else if aOpKindStr  = 'foGreaterEqual' then
    Result := foGreaterEqual

  // Plus a boring list of other if-else
end;

procedure UseStrToOperatorKind(const aFilterItem: IXmlDomElement);
begin
  if aFilterItem.nodeName = CUSTFILTER_FILTERITEM then
  begin                              // It is an FilterItem
    vStr := VarToStr(aFilterItem.getAttribute(CUSTFILTER_COLPROP));  // Get the columnname
    vOperatorKind := StrToOperatorKind(aFilterItem.getAttribute(CUSTFILTER_ITEMOPERATOR));
end;

procedure UseOperatorKindToStr(const aFilterItem: TcxCustomFilterCriteriaItem);
var
  vStr: String;
begin
  if Supports(TcxFilterCriteriaItem(aFilterItem).ItemLink, TcxGridColumn, GridCol) then
    vStr := OperatorKindToStr(TcxFilterCriteriaItem(aFilterItem).OperatorKind);
end;

显然我希望strotoperatorkind和OperatorKindToStr更聪明一点。 我在VCL TypeInfo中尝试了GetEnumProp方法，但它不起作用。

---

那么，如何将TcxFilterOperatorKind属性从aFilterItem变量提取为字符串并返回到TcxFilterOperatorKind？

GetEnumProp无法工作，因为它是错误的函数。不过你很接近。尝试GetEnumName和GetEnumValue，它们也在TypInfo单元中。

使用梅森指出的GetEnumName和GetEnumValue二重唱

您的功能应该变得更简单：

function OperatorKindToStr(const aOperatorKind: TcxFilterOperatorKind): string;
begin
  Result := GetEnumName(TypeInfo(TcxFilterOperatorKind), Ord(aOperatorKind));
end;

function StrToOperatorKind(const aOpKindStr: string): TcxFilterOperatorKind;
begin
  Result := TcxFilterOperatorKind(GetEnumValue(TypeInfo(TcxFilterOperatorKind), aOpKindStr));
end;