Microsoft Dynamics AX (Archived)

Adding "byRef" parameter to function

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Posted on by Community Member

Hello,

What is the equivalent to C# in X++?

int myfunc(byref x)

{

}

I want to change the x value in myfunc, in order the calling function would get the new value passed as a parameter.

Thanks :)

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Community Member on at

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Hi, you need to look at parm methods and args. Refer to almost any AX class to see how to use this.

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Denis Patrakov on at

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There is a "byref" keywork in X++ but it's only intended for CLR interop (to match a signature of a method that requires a parameter to by passed byref). For X++ code you should pass an argument of a reference type if you want the changes to be "visible" in the calling code. For arguments of value types such as int/date/str you can use a "wrapper" - see SysAnyType class.

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Community Member on at

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I know those methods.

Isn't any other common way to send "byref" parameters to function (that can be changed, as C#, v.b, etc. does) ?

Thanks :)

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Hossein.K 6,648 on at

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Hi Eitan Mizrahi ,

You can use the X++ keyword byref to call .NET methods that take parameters by reference.

In all X++ methods, all parameters are passed by value. In .NET, parameters can be passed by value or by reference.

You must understand the parameter passing concepts of by value versus by reference before you can correctly use the byref keyword.

You can use this link :

msdn.microsoft.com/.../cc586700.aspx

kind regards

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Amir Kaftari 210 on at

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Hi Eitan.

The following code example has a section for the X++ caller method and a section for the C# called method. The called method adds 456 to its parameter variable iTest. The caller method can detect that the addition occurred.

Caller Method :

public void CallerMethodByReferenceInt // X++ { int iTest = 3; ; TheNamespace.DemoClassNet::CalledMethodByReferenceInt (byref iTest); if (iTest == 459) { info("Good, == 459.") } }

Called Method :

static public void CalledMethodByReferenceInt // C# (ref int iTest) // by reference { iTest = iTest + 456; // Caller can detect. }

I hope to be used.

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