delphi property read writer 如何使用

2021-05-12 04:26

阅读:558

type
TMyClass = class(TObject)
private
FMyName: string;
FMyAge: Integer;
procedure SetAge(age: Integer);
function GetAge(): Integer;
published
property MyName: string read FMyName write FMyName;
property MyAge: Integer read GetAge write SetAge;
end;

procedure TMyClass.SetAge(age: Integer);
begin
if (age 200) then
ShowMessage(‘当前设置的年龄数值: ‘ + IntToStr(age) + ‘不是有效的年龄数值‘)
else FMyAge := age;
end;

function TmyClass.GetAge: Integer;
begin
Result := FMyAge;
end;

// 测试
procedure TForm1.Button1Click(Sender: TObject);
var
ta: TMyClass;
begin
ta := TMyClass.Create;
ShowMessage(‘myname:‘ + ta.MyName + ‘, myage:‘ + IntToStr(ta.MyAge));
ta.MyName := ‘Tom‘;
ta.MyAge := -10;
ShowMessage(‘myname:‘ + ta.MyName + ‘, myage:‘ + IntToStr(ta.MyAge));
ta.MyAge := 22;
ShowMessage(‘myname:‘ + ta.MyName + ‘, myage:‘ + IntToStr(ta.MyAge));
ta.free;
end;


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