字符串判断的问题,在线等待！
几年没写代码了，怎么XE2下面，原来的判断字符串的函数不能用了？
function IsNumberic(Vaule:String):Boolean;
var
i:integer;
begin
Result:=true;
Vaule:=Trim(Vaule);
for i:=1 to length(Vaule) do
begin
if not Vaule[i] in ['0'..'9'] then
begin
result:=false;
exit;
end;
end;
end;

[DCC Error] uOperation.pas(23): E2015 Operator not applicable to this operand type
改成AnsiString也不行，哪位帮解惑一下？....

[解决办法]
if not (Vaule[i] in ['0'..'9']) then