V9 - How to access web methods from within a server side C# script

Hi,

Does anyone has sample code for calling a web method from server side C# script?

I have a webservice with a method that has parameters which are of complex types and if I am not wrong we cannot pass objects as parameters when it is promoted to "activities" toolbox. Hence the need to call the webservice using a script.

I have created a connection of type "WebService" in the project and ProxyScript and CodeScript seems to be generated fine

I have also included the following in the "using" declaration.

using

Metastorm.Runtime.Models.myProject.WCF.myWebService;

Thanks a lot for your help

Regards

Sandeep

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Comments

achopra

Sandeep,

One approach that you can take for passing complex objects as parameters for promoted web service Activities is to create a server script function which builds up the complex type and returns the complex type object. Then, in your visual script activity parameter, just call the server script function (which you could also promote to the expression builder if you wanted, to make calling it slightly easier).

Sandeep Gupta

Thanks Ari,

I tried that option already. However, the expression builder gives an error when the promoted script function which returns the complex type is called as the parameter to the web method. I will post the implementation and error message tomorrow morning.

Maybe I am not implementing it correctly.

Ethan Beisher

Attached is an example using the technique Ari describes. Examine the solution and see if it points you in the right direction..

- Ethan

Grzegorz Lag

Hello Ethan

I think your example is very good, but could you describe how to handle errors with visual script based on webmethod?

I was trying to analyzy proxy class, but i'm not sure how to handle errors properly.

Regards

Greg

Sandeep Gupta

Hi Ethan,

I tried the same steps in my project.

However, I am getting the following error in the Expression Builder when I call the promoted server side script function in the promoted Web Method

'object.~Object()' is a "method", which is not valid in the given context

Thanks a lot for your help

Regards

Sandeep

Sandeep Gupta

Hello Ethan,

I was able to successfully call another web method of the webservice that returns a string value.

The web method I am calling returns an object. Is that the reason why I am getting the error?

If that is true, then I believe we will need to write a server side script function to handle the complex type return value.

Do we a sample of how to call the webmethod from the C# script function?

Regards

Sandeep

Sandeep Gupta

For some reason, I was not able to find the webmethod in the webservice object yesterday.

Here is the solution that works.

In order for the Webmethod to be available for use in the Server Script function, the method needs to be promoted to "Activities toolbox" in the connection object.

It can be then be accessed in the script method similar to below

myWebService.myWebMethod(parameter1, parameter2);

Thanks everyone for the help

Regards

Sandeep

Ethan Beisher

Greg,

I believe you would create a promoted function that calls the web service. In the function, you can use try...catch or other methods to catch any exceptions or SOAP faults. You could then raise a flag, return alternate data or use other methods to handle the error.

I have not done this yet. I will try to get an example posted.

Grzegorz Lag

Ethan

It's easy to do this in code, but how to "model" this with visual script?

IN WWF you have some extra tab to error handnling stuff