I am a .NET developer and very beginner with Delphi.
I want to create a static class and use the properties like this
MyVariable := MyStaticClass.MyProperty;
I don't know how to do that.
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2 Answers
Use Class Properties for this;
type
TMyClass = class
strict private
class var // Note fields must be declared as class fields
FRed: Integer;
FGreen: Integer;
FBlue: Integer;
public // ends the class var block
class property Red: Integer read FRed write FRed;
class property Green: Integer read FGreen write FGreen;
class property Blue: Integer read FBlue write FBlue;
end
In this example, properties named Red, Green and Blue can be used without an object reference. For document; Class Properties
To declare a readonly class (static) property;
TMyClass = class
private
const FRedValue:Integer = 10;
public
class property Red: Integer read FRedValue;
end;
To use this;
aColorVariable := TMyClass.Red;
12 Comments
zolfaghari
how can i implement that ?should i create unit ? and i had a lot of errors
sddk
No you do not have to create a new unit, you can declare multiple class in a unit. Just copy the code except type keyword, and paste it in a unit under existing type keyword. But to have a clean code, splitting objects into different units can be a good practice.
zolfaghari
i want to set static data for that and use it on other class . how can i change [ class property Red: Integer read FRed write FRed;] to class property myprop: Integer read '10' write '10';
DelphiCoder
@sddk You can have multiple
type keywords in one unit!zolfaghari
@sddk Yes It Must Be ReadOnly
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Tips : Unit somhow equals to Class on .NET Finally i resolve my problem by add those properties to my unit like below :
create a unit by right click on the solution name and add > unit
declare a const like below :
const myPropertyName:Integer = 0;
add it to your form who you want to use it by
uses YOUR_UNIT_NAME;
After
interface
section on the form
- And all i need to do is type my property name who i declared on the unit( myPropertyName)
3 Comments
sddk
No, this is not a static property!
Olivier
What you defined is called a global constant.
zolfaghari
All I need is property who I can call everywhere I want on entire solution