这是一个用于从DevExpress网格中的过滤器获取filtertype运算符的codesnippet: OperatorKindToStr用于从过滤器中提取operatorkind作为字符串并将其存储在xml文件中。 StrToOperatorKind用于将xml中的字符串转换为过滤器中的操作对象。将DevExpress TcxFilterOperatorKind转换为字符串还是从字符串转换?
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StrToOperatorKind和OperatorKindToStr有点聪明。 我已经尝试过VCL TypeInfo中的GetEnumProp方法,但它不起作用。 那么如何从aFilterItem变量中提取TcxFilterOperatorKind属性为字符串并返回到TcxFilterOperatorKind?
没错!这是正确的。感谢您的建议。 – 2009-09-10 19:49:32