Microsoft Dynamics NAV (Archived)

Navision 2013 pass parameter null to Dotnet function

(0) Share

Report

Posted on by CristianAguerre

147

I'm trying to call a DotNet function:

long.TryParse(hexNumber, System.Globalization.NumberStyles.HexNumber, null, out result);

I have problems to the null parameter, how I can pass null to Dotnet from Navision?

Thanks in advance

*This post is locked for comments

I have the same question (0)

All responses (6)

Answers (1)

Hannes Holst 5,767 on at

Like (0)

Report

Hi,

That looks like a parameter with a lot of sense :-)

Does a Variant-variable work?

Was this reply helpful? Yes No
CristianAguerre 147 on at

Like (1)

Report

Hi @Hannes Holst ,

I tried with variant and didn't work, I tried with a DotNet mscorelib System.Object and do not assign value to be null and eather.

Finally (I don't think is the best solution...) I create my own Dotnet and put the call in my own method (my method not need parameter null ;-) ) .

If anywone know best way to do it please share :)

Best regards.

Was this reply helpful? Yes No
Verified answer

Guillem Padilla 427 on at

Like (0)

Report
Hi,

You should make a DotNet variable of the same parameter object type, in this case you want to null the IFormatProvider parameter

You can get it in mscorlib assembly System.IFormatProvider

If you execute MESSAGE(FORMAT(IFormatProvider)), you will get null value, so I think that you can do:

long.TryParse(hexNumber, System.Globalization.NumberStyles.HexNumber, IFormatProvider, out result);

Please, try this and share if it worked

Thanks!

Was this reply helpful? Yes No
CristianAguerre 147 on at

Like (0)

Report

Hi @Guillem Padilla,

Your solution sounds really good but didn't work.

I tried and the system throws error "The call is ambigous" when I try to compile the object.

Thank you for your time.

Best regards.

Was this reply helpful? Yes No
Suggested answer

Guillem Padilla 427 on at

Like (1)

Report
Hello,

I have reproduced the error and it seems that it is because of the out result parameter, if you call

long.Parse(HexNumber, System.Globalization.NumberStyles.HexNumber, IFormatProvider);

IFormatProvider being null

It does not give compilation errors ...

You will see that it works correctly, I have checked it.

Actually, with this, the doubt about how to pass null as a parameter is resolved.

The problem is that now another question arises, how to handle out result

How are you handling the returned value?

Was this reply helpful? Yes No

CristianAguerre

147 on at

Like (1)

Report

@Guillem Padilla,

It works! When I tried to use IformatProvider solution I selected by error IFormatable (sorry for the mistake).

To use the out paremeter you only need pass a varible with the correct type (in this case integer).

Here the code example and variable definitions:

//Variable definition

long	DotNet System.Int64.'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
NumberStyle	DotNet System.Globalization.NumberStyles.'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
TextOutVarTypeText	Integer
NumberHex	Text
IFormatProvider	DotNet System.IFormatProvider.'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

//Code Example

NumberHex := '#FF0000';
//METHOD SIGNATURE:
// [bool TryParse :=] long.TryParse(string s, ref long result)
long.TryParse(NumberHex, TextOutVarTypeText);//compile OK

//METHOD OVERLOAD SIGNATURE:
//[bool TryParse :=] long.TryParse(string s, System.Globalization.NumberStyles style, IFormatProvider provider, ref long result)
long.TryParse(NumberHex, NumberStyle.HexNumber, IFormatProvider, TextOutVarTypeText)

@Guillem Padilla thanks for your help.

Best regards.

Was this reply helpful? Yes No

Community site session details

Navision 2013 pass parameter null to Dotnet function

Helpful resources

Quick Links

Responsible AI policies

Neeraj Kumar – Community Spotlight

Congratulations to the November Top 10 Community Leaders!

Leaderboard > 🔒一 Microsoft Dynamics NAV (Archived)

Featured topics

Product updates

Community site session details

Navision 2013 pass parameter null to Dotnet function

Helpful resources

Quick Links

Responsible AI policies

Neeraj Kumar – Community Spotlight

Congratulations to the November Top 10 Community Leaders!

Subscribe to this forum!

Select categories

Leaderboard > 🔒一 Microsoft Dynamics NAV (Archived)

Featured topics

Product updates