Define methods in C#

Within a NetLogic, you can define a new method (for example,

Foo

) by using the following syntax:

public void Foo()
{
    // Code to run
}

OPC UA methods:

Can be referenced in
FactoryTalk Optix Studio
at design time.
Are callable at runtime.

To define an OPC UA method, add

[ExportMethod]

before the method. See the following example.

[ExportMethod]
public void Foo()
{
    // Code to run
}

You define method arguments in round brackets

()

after the method name.

An OPC UA method can have any number of input and output arguments.

To define an input argument:

Indicate the data type between the round brackets followed by the argument name.
Separate each argument with a comma.

In the following example, two integer input arguments,

speed

and

rpm

, are declared:

public void Foo(
int speed, 
int rpm)
{
    // Code to run
}

To define an output argument:

Indicate the keyword
out
followed by the data type and argument name between the round brackets.
Separate each argument with a comma.
Assign the values to the output arguments.

In the following example, two output arguments are defined,

result

and

motorSpeed

, of string and integer types respectively:

public void Foo(
out string result, 
out int motorSpeed)
{    
    result= "Ok";
    motorSpeed = motor.speed;
}

You can define both input and output arguments for the same method. In the following example, two input and two output arguments are defined:

public void Foo(
int speed, 
int rpm, 
out string result, 
out int motorSpeed)
{
    result = "Ok";
    motorSpeed = motor.speed;
}