Self or no Self

[Clifford_Coulter]

I have created a class called TpSensor and have a constructor used to set passed properties for each New sensor created (Sensors.Append(New TpSensor(“Storage Area”,2,“PWA2”,“LowTemp”))). I am curious why this works:

Self.Sensor_Name = Sensor_Name
Self.Sensor_Number = Sensor_Number
Self.Sensor_Bank = Sensor_Bank
Self.Sensor_Conversion_Type = Sensor_Conversion_Type

and this does not:

Sensor_Name = Sensor_Name
Sensor_Number = Sensor_Number
Sensor_Bank = Sensor_Bank
Sensor_Conversion_Type = Sensor_Conversion_Type

I thought the default was Self.

[Christian_Schmitz]

You need self to reference a property with same name as the parameter name.

[Andrew_Lambert]

@Clifford_Coulter

I thought the default was Self.

Unless a local variable, such as a parameter, has the same name.

[MarkusR]

@Clifford_Coulter

and this does not:

or you could rename your arguments
Sensor_Name = Name

[Clifford_Coulter]

@Christian_Schmitz

You need self to reference a property with same name as the parameter name.

Excellent piece of information and in my case I would be correct to pass it with another name. I will leave it as is so I remember it. Thanks

[Tim_Parnell]

@Clifford_Coulter

Excellent piece of information and in my case I would be correct to pass it with another name. I will leave it as is so I remember it. Thanks

I’ll sometimes name them with the additional word “input” if I can’t come up with anything clever.
Method MyMethod(Input_Sensor_Name as String, Input_Sensor_Number as Integer)

[Clifford_Coulter]

Is there a reason you would not want to use Self. to allow it to work with the same parameter and property name?

[Tim_Parnell]

Clarity in naming. I hate bad naming. If two things have the same name, one needs to be more specific.

[Clifford_Coulter]

Yes, I might think it could lead to confusion.

[Alex_McPhail1 (Alex McPhail)]

In the statement:
Sensor_Name = Sensor_Name

The complier cannot be sure which ‘Sensor_Name’ you are referring to (on either side of the equation), so as a default it always uses the most local instance of the identifier, which in this case, is a variable.