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 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
}

For more information, see Create an OPC UA method.

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;
}